Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 12:52:55 -0500, c <c@me.org> wrote:
>
>> Um, your statement is quite wrong. For instance, overdrive on my truck
>> reduces the RPM by 30% so yeah I am pretty sure my engine will wear out
>> sooner if I choose to never use it. I will agree with you on the lugging
>> part, especially if it causes pinging, but no, I will not sit here and
>> agree with you that my engine will last just as long turning 3000 RPM as
>> it does turning 2100 RPM. That's insane.
>
>
> Gee how did I put close to 200K and a few 4x4's 20 to 30 years ago
> with 4.10 and 4.56 gears and no OD???? RPM as long as it is not
> excessive (like 4000 to 5000 RPM cruises ) will not shorten life at
> all. 2500 RPM or cruise for a V8 is childs play. How about a Toyota
> that when 220K with a 3000 to 3500 RPM cruise and more and was using
> a quart maybe every 3500 miles then. Also true RPM drop is determined
> by OD ratio and to get a 30% drop you need a .7 (like on a 700R4 or
> 4L60 or .69 on a Ally 5 speed)
> -----------------
> TheSnoMan.com

Well, it just so happens I HAVE a 700R4. Don't come off as the only
person that knows how to figure out gear ratio calculations. Geezus, I
think sometimes you argue just for the sake of arguing.

Chris

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 12:16:47 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>> Your site appears to be totally useless garbage.
>>
>> No one 'knows' their freaking tranny ratio or their t-case ratio, most
>> do good to have their tire size and gear ratio.
>>
>> 'Comparing' tire sizes of old vs new to get a new speedometer reading is
>> garbage. The old tires were 'not' certified to have the correct speed
>> vs the gauge speed, so that is a GIGO situation. Garbage In Garbage Out.
>
>
> The GIGO is you,

So in other words you do not know how it works then right?

Figures, snowjobs don't work here snoman.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 12:16:47 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>> Your site appears to be totally useless garbage.
>>
>> No one 'knows' their freaking tranny ratio or their t-case ratio, most
>> do good to have their tire size and gear ratio.
>>
>> 'Comparing' tire sizes of old vs new to get a new speedometer reading is
>> garbage. The old tires were 'not' certified to have the correct speed
>> vs the gauge speed, so that is a GIGO situation. Garbage In Garbage Out.
>
>
> The GIGO is you,

So in other words you do not know how it works then right?

Figures, snowjobs don't work here snoman.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 12:16:47 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>> Your site appears to be totally useless garbage.
>>
>> No one 'knows' their freaking tranny ratio or their t-case ratio, most
>> do good to have their tire size and gear ratio.
>>
>> 'Comparing' tire sizes of old vs new to get a new speedometer reading is
>> garbage. The old tires were 'not' certified to have the correct speed
>> vs the gauge speed, so that is a GIGO situation. Garbage In Garbage Out.
>
>
> The GIGO is you,

So in other words you do not know how it works then right?

Figures, snowjobs don't work here snoman.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 12:16:47 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>> Your site appears to be totally useless garbage.
>>
>> No one 'knows' their freaking tranny ratio or their t-case ratio, most
>> do good to have their tire size and gear ratio.
>>
>> 'Comparing' tire sizes of old vs new to get a new speedometer reading is
>> garbage. The old tires were 'not' certified to have the correct speed
>> vs the gauge speed, so that is a GIGO situation. Garbage In Garbage Out.
>
>
> The GIGO is you,

So in other words you do not know how it works then right?

Figures, snowjobs don't work here snoman.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

If your pedal is near the metal, your engine is lugging at two grand and
using more gasoline than at a cruising speed of three grand, also fourth is
direct, and doesn't use any gears nor bearing like in overdrive. So it saves
the transmission, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"c" <c@me.org> wrote in message
news:46eebede$0$32530$4c368faf@roadrunner.com...
>
>
> Um, your statement is quite wrong. For instance, overdrive on my truck
> reduces the RPM by 30% so yeah I am pretty sure my engine will wear out
> sooner if I choose to never use it. I will agree with you on the lugging
> part, especially if it causes pinging, but no, I will not sit here and
> agree with you that my engine will last just as long turning 3000 RPM as
> it does turning 2100 RPM. That's insane.
>
> Chris



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

If your pedal is near the metal, your engine is lugging at two grand and
using more gasoline than at a cruising speed of three grand, also fourth is
direct, and doesn't use any gears nor bearing like in overdrive. So it saves
the transmission, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"c" <c@me.org> wrote in message
news:46eebede$0$32530$4c368faf@roadrunner.com...
>
>
> Um, your statement is quite wrong. For instance, overdrive on my truck
> reduces the RPM by 30% so yeah I am pretty sure my engine will wear out
> sooner if I choose to never use it. I will agree with you on the lugging
> part, especially if it causes pinging, but no, I will not sit here and
> agree with you that my engine will last just as long turning 3000 RPM as
> it does turning 2100 RPM. That's insane.
>
> Chris



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

If your pedal is near the metal, your engine is lugging at two grand and
using more gasoline than at a cruising speed of three grand, also fourth is
direct, and doesn't use any gears nor bearing like in overdrive. So it saves
the transmission, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"c" <c@me.org> wrote in message
news:46eebede$0$32530$4c368faf@roadrunner.com...
>
>
> Um, your statement is quite wrong. For instance, overdrive on my truck
> reduces the RPM by 30% so yeah I am pretty sure my engine will wear out
> sooner if I choose to never use it. I will agree with you on the lugging
> part, especially if it causes pinging, but no, I will not sit here and
> agree with you that my engine will last just as long turning 3000 RPM as
> it does turning 2100 RPM. That's insane.
>
> Chris



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

If your pedal is near the metal, your engine is lugging at two grand and
using more gasoline than at a cruising speed of three grand, also fourth is
direct, and doesn't use any gears nor bearing like in overdrive. So it saves
the transmission, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"c" <c@me.org> wrote in message
news:46eebede$0$32530$4c368faf@roadrunner.com...
>
>
> Um, your statement is quite wrong. For instance, overdrive on my truck
> reduces the RPM by 30% so yeah I am pretty sure my engine will wear out
> sooner if I choose to never use it. I will agree with you on the lugging
> part, especially if it causes pinging, but no, I will not sit here and
> agree with you that my engine will last just as long turning 3000 RPM as
> it does turning 2100 RPM. That's insane.
>
> Chris



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Doesn't your Rubicon automatically correct for tire size? Probably by
this '06 it also measures the distance from the ground.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"twaldron" <dude@hairsproutingbunions.com> wrote in message
news:WcxHi.1705$ec2.502@trnddc03...
>
> Your minimal tire size increase likely made your speedo/odo more
> accurate as they tend to read high from the manufacturer. That way
> warranties expire sooner and manufacturers save money. I'd bet you are
> very close now. For fuel economy, use the highest gear you can while
> staying in the power band (not lugging). Lugging will become immediately
> apparent and you do it by feel, not by someone telling you what RPM to
> run. If you shift into too high a gear, you will notice a power response
> loss and ultimately your engine will lug. Downshift.
>
> tw



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Doesn't your Rubicon automatically correct for tire size? Probably by
this '06 it also measures the distance from the ground.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"twaldron" <dude@hairsproutingbunions.com> wrote in message
news:WcxHi.1705$ec2.502@trnddc03...
>
> Your minimal tire size increase likely made your speedo/odo more
> accurate as they tend to read high from the manufacturer. That way
> warranties expire sooner and manufacturers save money. I'd bet you are
> very close now. For fuel economy, use the highest gear you can while
> staying in the power band (not lugging). Lugging will become immediately
> apparent and you do it by feel, not by someone telling you what RPM to
> run. If you shift into too high a gear, you will notice a power response
> loss and ultimately your engine will lug. Downshift.
>
> tw



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Doesn't your Rubicon automatically correct for tire size? Probably by
this '06 it also measures the distance from the ground.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"twaldron" <dude@hairsproutingbunions.com> wrote in message
news:WcxHi.1705$ec2.502@trnddc03...
>
> Your minimal tire size increase likely made your speedo/odo more
> accurate as they tend to read high from the manufacturer. That way
> warranties expire sooner and manufacturers save money. I'd bet you are
> very close now. For fuel economy, use the highest gear you can while
> staying in the power band (not lugging). Lugging will become immediately
> apparent and you do it by feel, not by someone telling you what RPM to
> run. If you shift into too high a gear, you will notice a power response
> loss and ultimately your engine will lug. Downshift.
>
> tw



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Doesn't your Rubicon automatically correct for tire size? Probably by
this '06 it also measures the distance from the ground.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"twaldron" <dude@hairsproutingbunions.com> wrote in message
news:WcxHi.1705$ec2.502@trnddc03...
>
> Your minimal tire size increase likely made your speedo/odo more
> accurate as they tend to read high from the manufacturer. That way
> warranties expire sooner and manufacturers save money. I'd bet you are
> very close now. For fuel economy, use the highest gear you can while
> staying in the power band (not lugging). Lugging will become immediately
> apparent and you do it by feel, not by someone telling you what RPM to
> run. If you shift into too high a gear, you will notice a power response
> loss and ultimately your engine will lug. Downshift.
>
> tw



--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
<LWBillHug...@------.net> wrote:
> Doesn't your Rubicon automatically correct for tire size? Probably by
> this '06 it also measures the distance from the ground.
> God Bless America, Bill O|||||||O
> mailto:LW------...@aol.comhttp://www.----------.com/
>
> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>
> news:WcxHi.1705$ec2.502@trnddc03...
>
>
>
> > Your minimal tire size increase likely made your speedo/odo more
> > accurate as they tend to read high from the manufacturer. That way
> > warranties expire sooner and manufacturers save money. I'd bet you are
> > very close now. For fuel economy, use the highest gear you can while
> > staying in the power band (not lugging). Lugging will become immediately
> > apparent and you do it by feel, not by someone telling you what RPM to
> > run. If you shift into too high a gear, you will notice a power response
> > loss and ultimately your engine will lug. Downshift.
>
> > tw
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com

Well, I do have an appt at the dealership tomorrow around 5 pm
(eastern time). When I find out whether or not my speedo is right on
or off a few mph, I will certainly post the results to let you all
know. In the meantime, I really don't have a lugging issue or a power
loss with the 3.07s and 31s. I can start up a moderate sized hill
doing 65 (according to the speedometer) in 5th gear, and not have to
stomp the gas pedal to continue going up the hill at a nice pace. I
am wondering if the spec sheet on my jeep is wrong, and I actually
have 3.73s. I will look at the rear diff case tonight and see what
the stamp says.

Re: ACCURATE SPEEDOMETER?
 

On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
<LWBillHug...@------.net> wrote:
> Doesn't your Rubicon automatically correct for tire size? Probably by
> this '06 it also measures the distance from the ground.
> God Bless America, Bill O|||||||O
> mailto:LW------...@aol.comhttp://www.----------.com/
>
> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>
> news:WcxHi.1705$ec2.502@trnddc03...
>
>
>
> > Your minimal tire size increase likely made your speedo/odo more
> > accurate as they tend to read high from the manufacturer. That way
> > warranties expire sooner and manufacturers save money. I'd bet you are
> > very close now. For fuel economy, use the highest gear you can while
> > staying in the power band (not lugging). Lugging will become immediately
> > apparent and you do it by feel, not by someone telling you what RPM to
> > run. If you shift into too high a gear, you will notice a power response
> > loss and ultimately your engine will lug. Downshift.
>
> > tw
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com

Well, I do have an appt at the dealership tomorrow around 5 pm
(eastern time). When I find out whether or not my speedo is right on
or off a few mph, I will certainly post the results to let you all
know. In the meantime, I really don't have a lugging issue or a power
loss with the 3.07s and 31s. I can start up a moderate sized hill
doing 65 (according to the speedometer) in 5th gear, and not have to
stomp the gas pedal to continue going up the hill at a nice pace. I
am wondering if the spec sheet on my jeep is wrong, and I actually
have 3.73s. I will look at the rear diff case tonight and see what
the stamp says.

Re: ACCURATE SPEEDOMETER?
 

On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
<LWBillHug...@------.net> wrote:
> Doesn't your Rubicon automatically correct for tire size? Probably by
> this '06 it also measures the distance from the ground.
> God Bless America, Bill O|||||||O
> mailto:LW------...@aol.comhttp://www.----------.com/
>
> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>
> news:WcxHi.1705$ec2.502@trnddc03...
>
>
>
> > Your minimal tire size increase likely made your speedo/odo more
> > accurate as they tend to read high from the manufacturer. That way
> > warranties expire sooner and manufacturers save money. I'd bet you are
> > very close now. For fuel economy, use the highest gear you can while
> > staying in the power band (not lugging). Lugging will become immediately
> > apparent and you do it by feel, not by someone telling you what RPM to
> > run. If you shift into too high a gear, you will notice a power response
> > loss and ultimately your engine will lug. Downshift.
>
> > tw
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com

Well, I do have an appt at the dealership tomorrow around 5 pm
(eastern time). When I find out whether or not my speedo is right on
or off a few mph, I will certainly post the results to let you all
know. In the meantime, I really don't have a lugging issue or a power
loss with the 3.07s and 31s. I can start up a moderate sized hill
doing 65 (according to the speedometer) in 5th gear, and not have to
stomp the gas pedal to continue going up the hill at a nice pace. I
am wondering if the spec sheet on my jeep is wrong, and I actually
have 3.73s. I will look at the rear diff case tonight and see what
the stamp says.

Re: ACCURATE SPEEDOMETER?
 

On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
<LWBillHug...@------.net> wrote:
> Doesn't your Rubicon automatically correct for tire size? Probably by
> this '06 it also measures the distance from the ground.
> God Bless America, Bill O|||||||O
> mailto:LW------...@aol.comhttp://www.----------.com/
>
> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>
> news:WcxHi.1705$ec2.502@trnddc03...
>
>
>
> > Your minimal tire size increase likely made your speedo/odo more
> > accurate as they tend to read high from the manufacturer. That way
> > warranties expire sooner and manufacturers save money. I'd bet you are
> > very close now. For fuel economy, use the highest gear you can while
> > staying in the power band (not lugging). Lugging will become immediately
> > apparent and you do it by feel, not by someone telling you what RPM to
> > run. If you shift into too high a gear, you will notice a power response
> > loss and ultimately your engine will lug. Downshift.
>
> > tw
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com

Well, I do have an appt at the dealership tomorrow around 5 pm
(eastern time). When I find out whether or not my speedo is right on
or off a few mph, I will certainly post the results to let you all
know. In the meantime, I really don't have a lugging issue or a power
loss with the 3.07s and 31s. I can start up a moderate sized hill
doing 65 (according to the speedometer) in 5th gear, and not have to
stomp the gas pedal to continue going up the hill at a nice pace. I
am wondering if the spec sheet on my jeep is wrong, and I actually
have 3.73s. I will look at the rear diff case tonight and see what
the stamp says.

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>

>
> BTW, if you want to restart this fued I will tear you a new one
> because you provide a lot of times to do it. The choice is yours. Your
> little more than a BSing troll with abig EGO problem.
> -----------------
> TheSnoMan.com

Instead of going off the deep end again and biting, hook, line and
sinker, why don't you just answer the questions about your site?

How can you get an accurate speedometer reading by comparing two
unknowns? That is a GIGO situation to me.

For one example, comparing the old and new tires. Makes no sense to me.
That will only tell you how much more or less one tire is off from the
'other', not how fast you are going.

For example again, when I bought my CJ7 with 31's it was only going 60
mph when the speedo said 65 mph according to a GPS. I then put 33's on
and it became correct according to GPS. That is the only way to know
short of a measured mile.

How come my CJ7's numbers don't work in the rpm vs mph box?

258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
rear.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>

>
> BTW, if you want to restart this fued I will tear you a new one
> because you provide a lot of times to do it. The choice is yours. Your
> little more than a BSing troll with abig EGO problem.
> -----------------
> TheSnoMan.com

Instead of going off the deep end again and biting, hook, line and
sinker, why don't you just answer the questions about your site?

How can you get an accurate speedometer reading by comparing two
unknowns? That is a GIGO situation to me.

For one example, comparing the old and new tires. Makes no sense to me.
That will only tell you how much more or less one tire is off from the
'other', not how fast you are going.

For example again, when I bought my CJ7 with 31's it was only going 60
mph when the speedo said 65 mph according to a GPS. I then put 33's on
and it became correct according to GPS. That is the only way to know
short of a measured mile.

How come my CJ7's numbers don't work in the rpm vs mph box?

258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
rear.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>

>
> BTW, if you want to restart this fued I will tear you a new one
> because you provide a lot of times to do it. The choice is yours. Your
> little more than a BSing troll with abig EGO problem.
> -----------------
> TheSnoMan.com

Instead of going off the deep end again and biting, hook, line and
sinker, why don't you just answer the questions about your site?

How can you get an accurate speedometer reading by comparing two
unknowns? That is a GIGO situation to me.

For one example, comparing the old and new tires. Makes no sense to me.
That will only tell you how much more or less one tire is off from the
'other', not how fast you are going.

For example again, when I bought my CJ7 with 31's it was only going 60
mph when the speedo said 65 mph according to a GPS. I then put 33's on
and it became correct according to GPS. That is the only way to know
short of a measured mile.

How come my CJ7's numbers don't work in the rpm vs mph box?

258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
rear.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

SnoMan wrote:
> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>

>
> BTW, if you want to restart this fued I will tear you a new one
> because you provide a lot of times to do it. The choice is yours. Your
> little more than a BSing troll with abig EGO problem.
> -----------------
> TheSnoMan.com

Instead of going off the deep end again and biting, hook, line and
sinker, why don't you just answer the questions about your site?

How can you get an accurate speedometer reading by comparing two
unknowns? That is a GIGO situation to me.

For one example, comparing the old and new tires. Makes no sense to me.
That will only tell you how much more or less one tire is off from the
'other', not how fast you are going.

For example again, when I bought my CJ7 with 31's it was only going 60
mph when the speedo said 65 mph according to a GPS. I then put 33's on
and it became correct according to GPS. That is the only way to know
short of a measured mile.

How come my CJ7's numbers don't work in the rpm vs mph box?

258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
rear.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:
> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>> this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>> mailto:LW------...@aol.comhttp://www.----------.com/
>>
>> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>> news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>> Your minimal tire size increase likely made your speedo/odo more
>>> accurate as they tend to read high from the manufacturer. That way
>>> warranties expire sooner and manufacturers save money. I'd bet you are
>>> very close now. For fuel economy, use the highest gear you can while
>>> staying in the power band (not lugging). Lugging will become immediately
>>> apparent and you do it by feel, not by someone telling you what RPM to
>>> run. If you shift into too high a gear, you will notice a power response
>>> loss and ultimately your engine will lug. Downshift.
>>> tw
>> --
>> Posted via a free Usenet account fromhttp://www.teranews.com
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Gas mileage tells all for highway running.

You can block it and jack up one wheel then count the driveshaft turns
when you spin the wheel twice to get your ratio. A chalk mark on both
the wheel and one ear of the driveshaft helps for counting.

Your driveshaft will spin just over three times, or close to 4 times
depending on which ones you have when you turn the wheel twice.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:
> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>> this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>> mailto:LW------...@aol.comhttp://www.----------.com/
>>
>> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>> news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>> Your minimal tire size increase likely made your speedo/odo more
>>> accurate as they tend to read high from the manufacturer. That way
>>> warranties expire sooner and manufacturers save money. I'd bet you are
>>> very close now. For fuel economy, use the highest gear you can while
>>> staying in the power band (not lugging). Lugging will become immediately
>>> apparent and you do it by feel, not by someone telling you what RPM to
>>> run. If you shift into too high a gear, you will notice a power response
>>> loss and ultimately your engine will lug. Downshift.
>>> tw
>> --
>> Posted via a free Usenet account fromhttp://www.teranews.com
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Gas mileage tells all for highway running.

You can block it and jack up one wheel then count the driveshaft turns
when you spin the wheel twice to get your ratio. A chalk mark on both
the wheel and one ear of the driveshaft helps for counting.

Your driveshaft will spin just over three times, or close to 4 times
depending on which ones you have when you turn the wheel twice.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:
> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>> this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>> mailto:LW------...@aol.comhttp://www.----------.com/
>>
>> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>> news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>> Your minimal tire size increase likely made your speedo/odo more
>>> accurate as they tend to read high from the manufacturer. That way
>>> warranties expire sooner and manufacturers save money. I'd bet you are
>>> very close now. For fuel economy, use the highest gear you can while
>>> staying in the power band (not lugging). Lugging will become immediately
>>> apparent and you do it by feel, not by someone telling you what RPM to
>>> run. If you shift into too high a gear, you will notice a power response
>>> loss and ultimately your engine will lug. Downshift.
>>> tw
>> --
>> Posted via a free Usenet account fromhttp://www.teranews.com
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Gas mileage tells all for highway running.

You can block it and jack up one wheel then count the driveshaft turns
when you spin the wheel twice to get your ratio. A chalk mark on both
the wheel and one ear of the driveshaft helps for counting.

Your driveshaft will spin just over three times, or close to 4 times
depending on which ones you have when you turn the wheel twice.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:
> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>> this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>> mailto:LW------...@aol.comhttp://www.----------.com/
>>
>> "twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>> news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>> Your minimal tire size increase likely made your speedo/odo more
>>> accurate as they tend to read high from the manufacturer. That way
>>> warranties expire sooner and manufacturers save money. I'd bet you are
>>> very close now. For fuel economy, use the highest gear you can while
>>> staying in the power band (not lugging). Lugging will become immediately
>>> apparent and you do it by feel, not by someone telling you what RPM to
>>> run. If you shift into too high a gear, you will notice a power response
>>> loss and ultimately your engine will lug. Downshift.
>>> tw
>> --
>> Posted via a free Usenet account fromhttp://www.teranews.com
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Gas mileage tells all for highway running.

You can block it and jack up one wheel then count the driveshaft turns
when you spin the wheel twice to get your ratio. A chalk mark on both
the wheel and one ear of the driveshaft helps for counting.

Your driveshaft will spin just over three times, or close to 4 times
depending on which ones you have when you turn the wheel twice.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> SnoMan wrote:
>> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>
>
>>
>> BTW, if you want to restart this fued I will tear you a new one
>> because you provide a lot of times to do it. The choice is yours. Your
>> little more than a BSing troll with abig EGO problem. -----------------
>> TheSnoMan.com
>
> Instead of going off the deep end again and biting, hook, line and
> sinker, why don't you just answer the questions about your site?
>
> How can you get an accurate speedometer reading by comparing two
> unknowns? That is a GIGO situation to me.
>
> For one example, comparing the old and new tires. Makes no sense to me.
> That will only tell you how much more or less one tire is off from the
> 'other', not how fast you are going.
>
> For example again, when I bought my CJ7 with 31's it was only going 60
> mph when the speedo said 65 mph according to a GPS. I then put 33's on
> and it became correct according to GPS. That is the only way to know
> short of a measured mile.
>
> How come my CJ7's numbers don't work in the rpm vs mph box?
>
> 258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
> rear.
>
> Mike

Mike, I didn't look at that site, but the calculation is quite simple in
case you don't have it.

MPH = RPM*TireDIa/(GearRatio*TcaseRatio*TransRatio*336)

Chris

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> SnoMan wrote:
>> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>
>
>>
>> BTW, if you want to restart this fued I will tear you a new one
>> because you provide a lot of times to do it. The choice is yours. Your
>> little more than a BSing troll with abig EGO problem. -----------------
>> TheSnoMan.com
>
> Instead of going off the deep end again and biting, hook, line and
> sinker, why don't you just answer the questions about your site?
>
> How can you get an accurate speedometer reading by comparing two
> unknowns? That is a GIGO situation to me.
>
> For one example, comparing the old and new tires. Makes no sense to me.
> That will only tell you how much more or less one tire is off from the
> 'other', not how fast you are going.
>
> For example again, when I bought my CJ7 with 31's it was only going 60
> mph when the speedo said 65 mph according to a GPS. I then put 33's on
> and it became correct according to GPS. That is the only way to know
> short of a measured mile.
>
> How come my CJ7's numbers don't work in the rpm vs mph box?
>
> 258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
> rear.
>
> Mike

Mike, I didn't look at that site, but the calculation is quite simple in
case you don't have it.

MPH = RPM*TireDIa/(GearRatio*TcaseRatio*TransRatio*336)

Chris

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> SnoMan wrote:
>> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>
>
>>
>> BTW, if you want to restart this fued I will tear you a new one
>> because you provide a lot of times to do it. The choice is yours. Your
>> little more than a BSing troll with abig EGO problem. -----------------
>> TheSnoMan.com
>
> Instead of going off the deep end again and biting, hook, line and
> sinker, why don't you just answer the questions about your site?
>
> How can you get an accurate speedometer reading by comparing two
> unknowns? That is a GIGO situation to me.
>
> For one example, comparing the old and new tires. Makes no sense to me.
> That will only tell you how much more or less one tire is off from the
> 'other', not how fast you are going.
>
> For example again, when I bought my CJ7 with 31's it was only going 60
> mph when the speedo said 65 mph according to a GPS. I then put 33's on
> and it became correct according to GPS. That is the only way to know
> short of a measured mile.
>
> How come my CJ7's numbers don't work in the rpm vs mph box?
>
> 258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
> rear.
>
> Mike

Mike, I didn't look at that site, but the calculation is quite simple in
case you don't have it.

MPH = RPM*TireDIa/(GearRatio*TcaseRatio*TransRatio*336)

Chris

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> SnoMan wrote:
>> On Mon, 17 Sep 2007 11:44:39 -0400, Mike Romain <romainm@sympatico.ca>
>
>>
>> BTW, if you want to restart this fued I will tear you a new one
>> because you provide a lot of times to do it. The choice is yours. Your
>> little more than a BSing troll with abig EGO problem. -----------------
>> TheSnoMan.com
>
> Instead of going off the deep end again and biting, hook, line and
> sinker, why don't you just answer the questions about your site?
>
> How can you get an accurate speedometer reading by comparing two
> unknowns? That is a GIGO situation to me.
>
> For one example, comparing the old and new tires. Makes no sense to me.
> That will only tell you how much more or less one tire is off from the
> 'other', not how fast you are going.
>
> For example again, when I bought my CJ7 with 31's it was only going 60
> mph when the speedo said 65 mph according to a GPS. I then put 33's on
> and it became correct according to GPS. That is the only way to know
> short of a measured mile.
>
> How come my CJ7's numbers don't work in the rpm vs mph box?
>
> 258, T-5 tranny in 4th should be 1:1, Dana 300 t-case is 1:1, 3.31:1 D44
> rear.
>
> Mike

Mike, I didn't look at that site, but the calculation is quite simple in
case you don't have it.

MPH = RPM*TireDIa/(GearRatio*TcaseRatio*TransRatio*336)

Chris

Re: ACCURATE SPEEDOMETER?
 

Jeff, I'm relieved that at least someone chimed in with the relevant answer
on the speed - virtually ANY speedometer will be dead on if you use the
odometer to measure your mile since both the speed and distance shown is
derived from how fast a shaft turning, not from actual distance covered.
The same error in speed is translated to distance. You need a "measured
mile" - I like a 4-5 mile stretch since it averages out the speed better
and minimizes timing errors.

As for engine loading, a cheap vacuum gauge will tell you an awful lot about
the best gear to use in a given situation. Basically, the higher the
vacuum, the easier the engine is working for a given situation. Of course,
the position of your right foot on the skinny pedal tells you about the
same thing, but the calibration is a tad suspect <g>.

Jeff Strickland wrote:

> Your watch is a bit clunky, but the method is correct.
>
> A stop watch works better. Ignore the odometer, and measure your miles
> with the mile markers along the shoulder of all federal and most state
> highways. Divide the time in seconds that it takes to travel a measured
> mile into 3600, the result will be your speed.
>
> Set the Cruise Control at 60. Measure the time it takes to go a mile.
> Divide 3600 by the time. 3600 / 60 =- 60. 3600 / 52 = 70. 3600 / 45 = 80.
>
>
>
>
> "Tracie" <brainart@upstate.edu> wrote in message
> news:1190034987.028338.291940@19g2000hsx.googlegro ups.com...
>> Hello all. I have a 2006 Wrangler X with 6 speed manual tranny, 3.07
>> gearing, and D30 front/35 rear. I recently upgraded my tires from the
>> stock 215/75/15 to 31/10.5/15 BFG All Terrain T/A KO. I am looking
>> for a reliable way to tell if my speedometer is off at all with the
>> tire upgrade. I do not have access to a GPS system. What I HAVE done
>> is to use the tripometer (with tenths), and hold steady at 60 mph (my
>> speedometer said 60) for one mile while watching my clock. I am
>> EXTREMELY close to going 1 mile in 1 minute by using this method. Is
>> this reliable to tell whether or not my speedometer is dead on? I
>> have NOT changed the speedometer gear yet, or had the computer changed
>> to reflect the larger sized tires. Also, I am not using my OD (6th)
>> much on the highway, but when I get up to 65 (the speedometer says
>> 65), I am running at about 2500 rpms in 5th. Is this bad, or should I
>> be shifting into the OD (6th)? I do fine with 1st through 5th. Just
>> not sure what speed or what rpms I should be using 6th. Any help is
>> really appreciated.
>>

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Jeff, I'm relieved that at least someone chimed in with the relevant answer
on the speed - virtually ANY speedometer will be dead on if you use the
odometer to measure your mile since both the speed and distance shown is
derived from how fast a shaft turning, not from actual distance covered.
The same error in speed is translated to distance. You need a "measured
mile" - I like a 4-5 mile stretch since it averages out the speed better
and minimizes timing errors.

As for engine loading, a cheap vacuum gauge will tell you an awful lot about
the best gear to use in a given situation. Basically, the higher the
vacuum, the easier the engine is working for a given situation. Of course,
the position of your right foot on the skinny pedal tells you about the
same thing, but the calibration is a tad suspect <g>.

Jeff Strickland wrote:

> Your watch is a bit clunky, but the method is correct.
>
> A stop watch works better. Ignore the odometer, and measure your miles
> with the mile markers along the shoulder of all federal and most state
> highways. Divide the time in seconds that it takes to travel a measured
> mile into 3600, the result will be your speed.
>
> Set the Cruise Control at 60. Measure the time it takes to go a mile.
> Divide 3600 by the time. 3600 / 60 =- 60. 3600 / 52 = 70. 3600 / 45 = 80.
>
>
>
>
> "Tracie" <brainart@upstate.edu> wrote in message
> news:1190034987.028338.291940@19g2000hsx.googlegro ups.com...
>> Hello all. I have a 2006 Wrangler X with 6 speed manual tranny, 3.07
>> gearing, and D30 front/35 rear. I recently upgraded my tires from the
>> stock 215/75/15 to 31/10.5/15 BFG All Terrain T/A KO. I am looking
>> for a reliable way to tell if my speedometer is off at all with the
>> tire upgrade. I do not have access to a GPS system. What I HAVE done
>> is to use the tripometer (with tenths), and hold steady at 60 mph (my
>> speedometer said 60) for one mile while watching my clock. I am
>> EXTREMELY close to going 1 mile in 1 minute by using this method. Is
>> this reliable to tell whether or not my speedometer is dead on? I
>> have NOT changed the speedometer gear yet, or had the computer changed
>> to reflect the larger sized tires. Also, I am not using my OD (6th)
>> much on the highway, but when I get up to 65 (the speedometer says
>> 65), I am running at about 2500 rpms in 5th. Is this bad, or should I
>> be shifting into the OD (6th)? I do fine with 1st through 5th. Just
>> not sure what speed or what rpms I should be using 6th. Any help is
>> really appreciated.
>>

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Jeff, I'm relieved that at least someone chimed in with the relevant answer
on the speed - virtually ANY speedometer will be dead on if you use the
odometer to measure your mile since both the speed and distance shown is
derived from how fast a shaft turning, not from actual distance covered.
The same error in speed is translated to distance. You need a "measured
mile" - I like a 4-5 mile stretch since it averages out the speed better
and minimizes timing errors.

As for engine loading, a cheap vacuum gauge will tell you an awful lot about
the best gear to use in a given situation. Basically, the higher the
vacuum, the easier the engine is working for a given situation. Of course,
the position of your right foot on the skinny pedal tells you about the
same thing, but the calibration is a tad suspect <g>.

Jeff Strickland wrote:

> Your watch is a bit clunky, but the method is correct.
>
> A stop watch works better. Ignore the odometer, and measure your miles
> with the mile markers along the shoulder of all federal and most state
> highways. Divide the time in seconds that it takes to travel a measured
> mile into 3600, the result will be your speed.
>
> Set the Cruise Control at 60. Measure the time it takes to go a mile.
> Divide 3600 by the time. 3600 / 60 =- 60. 3600 / 52 = 70. 3600 / 45 = 80.
>
>
>
>
> "Tracie" <brainart@upstate.edu> wrote in message
> news:1190034987.028338.291940@19g2000hsx.googlegro ups.com...
>> Hello all. I have a 2006 Wrangler X with 6 speed manual tranny, 3.07
>> gearing, and D30 front/35 rear. I recently upgraded my tires from the
>> stock 215/75/15 to 31/10.5/15 BFG All Terrain T/A KO. I am looking
>> for a reliable way to tell if my speedometer is off at all with the
>> tire upgrade. I do not have access to a GPS system. What I HAVE done
>> is to use the tripometer (with tenths), and hold steady at 60 mph (my
>> speedometer said 60) for one mile while watching my clock. I am
>> EXTREMELY close to going 1 mile in 1 minute by using this method. Is
>> this reliable to tell whether or not my speedometer is dead on? I
>> have NOT changed the speedometer gear yet, or had the computer changed
>> to reflect the larger sized tires. Also, I am not using my OD (6th)
>> much on the highway, but when I get up to 65 (the speedometer says
>> 65), I am running at about 2500 rpms in 5th. Is this bad, or should I
>> be shifting into the OD (6th)? I do fine with 1st through 5th. Just
>> not sure what speed or what rpms I should be using 6th. Any help is
>> really appreciated.
>>

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Jeff, I'm relieved that at least someone chimed in with the relevant answer
on the speed - virtually ANY speedometer will be dead on if you use the
odometer to measure your mile since both the speed and distance shown is
derived from how fast a shaft turning, not from actual distance covered.
The same error in speed is translated to distance. You need a "measured
mile" - I like a 4-5 mile stretch since it averages out the speed better
and minimizes timing errors.

As for engine loading, a cheap vacuum gauge will tell you an awful lot about
the best gear to use in a given situation. Basically, the higher the
vacuum, the easier the engine is working for a given situation. Of course,
the position of your right foot on the skinny pedal tells you about the
same thing, but the calibration is a tad suspect <g>.

Jeff Strickland wrote:

> Your watch is a bit clunky, but the method is correct.
>
> A stop watch works better. Ignore the odometer, and measure your miles
> with the mile markers along the shoulder of all federal and most state
> highways. Divide the time in seconds that it takes to travel a measured
> mile into 3600, the result will be your speed.
>
> Set the Cruise Control at 60. Measure the time it takes to go a mile.
> Divide 3600 by the time. 3600 / 60 =- 60. 3600 / 52 = 70. 3600 / 45 = 80.
>
>
>
>
> "Tracie" <brainart@upstate.edu> wrote in message
> news:1190034987.028338.291940@19g2000hsx.googlegro ups.com...
>> Hello all. I have a 2006 Wrangler X with 6 speed manual tranny, 3.07
>> gearing, and D30 front/35 rear. I recently upgraded my tires from the
>> stock 215/75/15 to 31/10.5/15 BFG All Terrain T/A KO. I am looking
>> for a reliable way to tell if my speedometer is off at all with the
>> tire upgrade. I do not have access to a GPS system. What I HAVE done
>> is to use the tripometer (with tenths), and hold steady at 60 mph (my
>> speedometer said 60) for one mile while watching my clock. I am
>> EXTREMELY close to going 1 mile in 1 minute by using this method. Is
>> this reliable to tell whether or not my speedometer is dead on? I
>> have NOT changed the speedometer gear yet, or had the computer changed
>> to reflect the larger sized tires. Also, I am not using my OD (6th)
>> much on the highway, but when I get up to 65 (the speedometer says
>> 65), I am running at about 2500 rpms in 5th. Is this bad, or should I
>> be shifting into the OD (6th)? I do fine with 1st through 5th. Just
>> not sure what speed or what rpms I should be using 6th. Any help is
>> really appreciated.
>>

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> twaldron wrote:
>
> Tracie wrote:
>
>>>
>>>
>>> So, assuming that my speedometer is correct, running approximately
>>> 2500 rpms in 5th gear at 65 mph will NOT hurt my engine or cause
>>> increased engine wear? If I were to shift into OD (6th), what is the
>>> approximate rpms that I should be running so as to not cause lugging
>>> or increased engine wear?
>>>
>>> THANKS
>>>
>>
>> Your minimal tire size increase likely made your speedo/odo more
>> accurate as they tend to read high from the manufacturer. That way
>> warranties expire sooner and manufacturers save money. I'd bet you are
>> very close now. For fuel economy, use the highest gear you can while
>> staying in the power band (not lugging). Lugging will become
>> immediately apparent and you do it by feel, not by someone telling you
>> what RPM to run. If you shift into too high a gear, you will notice a
>> power response loss and ultimately your engine will lug. Downshift.
>>
>> tw
>
>
> Jeep especially seems to like to have the speedometer high for some reason.
>
> The largest stock tire that is listed for my 88 Cherokee on the sticker
> is P225's, yet P235's make my speedometer accurate according to measured
> 'miles' and many GPS checks. The cops must think so too, because they
> don't stop me.
>
> Same for most TJ's. They 'do' list a 31 as the largest stock tire and
> according to what has been reported here, that makes them accurate with
> no t-case speedo gear change needed.
>
> I don't know how it worked, but my 86 CJ7 is accurate with 33's. It was
> 4mph + off with 31's (reading 65, doing 60) when I got it.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

Yup, exactly. I'm thinking she'll be closer with that tire change.

tw

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> twaldron wrote:
>
> Tracie wrote:
>
>>>
>>>
>>> So, assuming that my speedometer is correct, running approximately
>>> 2500 rpms in 5th gear at 65 mph will NOT hurt my engine or cause
>>> increased engine wear? If I were to shift into OD (6th), what is the
>>> approximate rpms that I should be running so as to not cause lugging
>>> or increased engine wear?
>>>
>>> THANKS
>>>
>>
>> Your minimal tire size increase likely made your speedo/odo more
>> accurate as they tend to read high from the manufacturer. That way
>> warranties expire sooner and manufacturers save money. I'd bet you are
>> very close now. For fuel economy, use the highest gear you can while
>> staying in the power band (not lugging). Lugging will become
>> immediately apparent and you do it by feel, not by someone telling you
>> what RPM to run. If you shift into too high a gear, you will notice a
>> power response loss and ultimately your engine will lug. Downshift.
>>
>> tw
>
>
> Jeep especially seems to like to have the speedometer high for some reason.
>
> The largest stock tire that is listed for my 88 Cherokee on the sticker
> is P225's, yet P235's make my speedometer accurate according to measured
> 'miles' and many GPS checks. The cops must think so too, because they
> don't stop me.
>
> Same for most TJ's. They 'do' list a 31 as the largest stock tire and
> according to what has been reported here, that makes them accurate with
> no t-case speedo gear change needed.
>
> I don't know how it worked, but my 86 CJ7 is accurate with 33's. It was
> 4mph + off with 31's (reading 65, doing 60) when I got it.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

Yup, exactly. I'm thinking she'll be closer with that tire change.

tw

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> twaldron wrote:
>
> Tracie wrote:
>
>>>
>>>
>>> So, assuming that my speedometer is correct, running approximately
>>> 2500 rpms in 5th gear at 65 mph will NOT hurt my engine or cause
>>> increased engine wear? If I were to shift into OD (6th), what is the
>>> approximate rpms that I should be running so as to not cause lugging
>>> or increased engine wear?
>>>
>>> THANKS
>>>
>>
>> Your minimal tire size increase likely made your speedo/odo more
>> accurate as they tend to read high from the manufacturer. That way
>> warranties expire sooner and manufacturers save money. I'd bet you are
>> very close now. For fuel economy, use the highest gear you can while
>> staying in the power band (not lugging). Lugging will become
>> immediately apparent and you do it by feel, not by someone telling you
>> what RPM to run. If you shift into too high a gear, you will notice a
>> power response loss and ultimately your engine will lug. Downshift.
>>
>> tw
>
>
> Jeep especially seems to like to have the speedometer high for some reason.
>
> The largest stock tire that is listed for my 88 Cherokee on the sticker
> is P225's, yet P235's make my speedometer accurate according to measured
> 'miles' and many GPS checks. The cops must think so too, because they
> don't stop me.
>
> Same for most TJ's. They 'do' list a 31 as the largest stock tire and
> according to what has been reported here, that makes them accurate with
> no t-case speedo gear change needed.
>
> I don't know how it worked, but my 86 CJ7 is accurate with 33's. It was
> 4mph + off with 31's (reading 65, doing 60) when I got it.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

Yup, exactly. I'm thinking she'll be closer with that tire change.

tw

Re: ACCURATE SPEEDOMETER?
 

Mike Romain wrote:
> twaldron wrote:
>
> Tracie wrote:
>
>>>
>>>
>>> So, assuming that my speedometer is correct, running approximately
>>> 2500 rpms in 5th gear at 65 mph will NOT hurt my engine or cause
>>> increased engine wear? If I were to shift into OD (6th), what is the
>>> approximate rpms that I should be running so as to not cause lugging
>>> or increased engine wear?
>>>
>>> THANKS
>>>
>>
>> Your minimal tire size increase likely made your speedo/odo more
>> accurate as they tend to read high from the manufacturer. That way
>> warranties expire sooner and manufacturers save money. I'd bet you are
>> very close now. For fuel economy, use the highest gear you can while
>> staying in the power band (not lugging). Lugging will become
>> immediately apparent and you do it by feel, not by someone telling you
>> what RPM to run. If you shift into too high a gear, you will notice a
>> power response loss and ultimately your engine will lug. Downshift.
>>
>> tw
>
>
> Jeep especially seems to like to have the speedometer high for some reason.
>
> The largest stock tire that is listed for my 88 Cherokee on the sticker
> is P225's, yet P235's make my speedometer accurate according to measured
> 'miles' and many GPS checks. The cops must think so too, because they
> don't stop me.
>
> Same for most TJ's. They 'do' list a 31 as the largest stock tire and
> according to what has been reported here, that makes them accurate with
> no t-case speedo gear change needed.
>
> I don't know how it worked, but my 86 CJ7 is accurate with 33's. It was
> 4mph + off with 31's (reading 65, doing 60) when I got it.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

Yup, exactly. I'm thinking she'll be closer with that tire change.

tw

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:

> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>>this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>>mailto:LW------...@aol.comhttp://www.----------.com/
>>
>>"twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>>news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>
>>>Your minimal tire size increase likely made your speedo/odo more
>>>accurate as they tend to read high from the manufacturer. That way
>>>warranties expire sooner and manufacturers save money. I'd bet you are
>>>very close now. For fuel economy, use the highest gear you can while
>>>staying in the power band (not lugging). Lugging will become immediately
>>>apparent and you do it by feel, not by someone telling you what RPM to
>>>run. If you shift into too high a gear, you will notice a power response
>>>loss and ultimately your engine will lug. Downshift.
>>
>>>tw
>>
>>--
>>Posted via a free Usenet account fromhttp://www.teranews.com
>
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Are you making a special trip to the dealer to check your speedo??

tw

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:

> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>>this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>>mailto:LW------...@aol.comhttp://www.----------.com/
>>
>>"twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>>news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>
>>>Your minimal tire size increase likely made your speedo/odo more
>>>accurate as they tend to read high from the manufacturer. That way
>>>warranties expire sooner and manufacturers save money. I'd bet you are
>>>very close now. For fuel economy, use the highest gear you can while
>>>staying in the power band (not lugging). Lugging will become immediately
>>>apparent and you do it by feel, not by someone telling you what RPM to
>>>run. If you shift into too high a gear, you will notice a power response
>>>loss and ultimately your engine will lug. Downshift.
>>
>>>tw
>>
>>--
>>Posted via a free Usenet account fromhttp://www.teranews.com
>
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Are you making a special trip to the dealer to check your speedo??

tw

Re: ACCURATE SPEEDOMETER?
 

Tracie wrote:

> On Sep 17, 3:49 pm, "L.W. \(Bill\) ------ III"
> <LWBillHug...@------.net> wrote:
>
>> Doesn't your Rubicon automatically correct for tire size? Probably by
>>this '06 it also measures the distance from the ground.
>> God Bless America, Bill O|||||||O
>>mailto:LW------...@aol.comhttp://www.----------.com/
>>
>>"twaldron" <d...@hairsproutingbunions.com> wrote in message
>>
>>news:WcxHi.1705$ec2.502@trnddc03...
>>
>>
>>
>>
>>>Your minimal tire size increase likely made your speedo/odo more
>>>accurate as they tend to read high from the manufacturer. That way
>>>warranties expire sooner and manufacturers save money. I'd bet you are
>>>very close now. For fuel economy, use the highest gear you can while
>>>staying in the power band (not lugging). Lugging will become immediately
>>>apparent and you do it by feel, not by someone telling you what RPM to
>>>run. If you shift into too high a gear, you will notice a power response
>>>loss and ultimately your engine will lug. Downshift.
>>
>>>tw
>>
>>--
>>Posted via a free Usenet account fromhttp://www.teranews.com
>
>
> Well, I do have an appt at the dealership tomorrow around 5 pm
> (eastern time). When I find out whether or not my speedo is right on
> or off a few mph, I will certainly post the results to let you all
> know. In the meantime, I really don't have a lugging issue or a power
> loss with the 3.07s and 31s. I can start up a moderate sized hill
> doing 65 (according to the speedometer) in 5th gear, and not have to
> stomp the gas pedal to continue going up the hill at a nice pace. I
> am wondering if the spec sheet on my jeep is wrong, and I actually
> have 3.73s. I will look at the rear diff case tonight and see what
> the stamp says.
>

Are you making a special trip to the dealer to check your speedo??

tw