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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 |
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