Ping Mike Romain about RPM sweet Spot
 

Mike,
You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .

Thanks
JD 2K-TJ

There are some simple truths...And the dogs know what they are."
Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

After the sweet spot talk....I can be in the sweet spot in my stock '02
doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
Which isn't a problem on the 400 highway here...but any benefit of being in
teh sweet spot for gas efficiency got killed by the excessive speed and lack
of aerodynamics.

I think the sweet spot they're talking about is basically the power band.
"JD" <jdcarroll@qwest.net> wrote in message
news:bc7ki0p7qqla7b7duukihoqa6v0jkuqsjq@4ax.com...
> Mike,
> You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
> a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
> the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .
>
> Thanks
> JD 2K-TJ
>
> There are some simple truths...And the dogs know what they are."
> Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

After the sweet spot talk....I can be in the sweet spot in my stock '02
doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
Which isn't a problem on the 400 highway here...but any benefit of being in
teh sweet spot for gas efficiency got killed by the excessive speed and lack
of aerodynamics.

I think the sweet spot they're talking about is basically the power band.
"JD" <jdcarroll@qwest.net> wrote in message
news:bc7ki0p7qqla7b7duukihoqa6v0jkuqsjq@4ax.com...
> Mike,
> You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
> a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
> the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .
>
> Thanks
> JD 2K-TJ
>
> There are some simple truths...And the dogs know what they are."
> Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

After the sweet spot talk....I can be in the sweet spot in my stock '02
doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
Which isn't a problem on the 400 highway here...but any benefit of being in
teh sweet spot for gas efficiency got killed by the excessive speed and lack
of aerodynamics.

I think the sweet spot they're talking about is basically the power band.
"JD" <jdcarroll@qwest.net> wrote in message
news:bc7ki0p7qqla7b7duukihoqa6v0jkuqsjq@4ax.com...
> Mike,
> You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
> a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
> the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .
>
> Thanks
> JD 2K-TJ
>
> There are some simple truths...And the dogs know what they are."
> Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

After the sweet spot talk....I can be in the sweet spot in my stock '02
doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
Which isn't a problem on the 400 highway here...but any benefit of being in
teh sweet spot for gas efficiency got killed by the excessive speed and lack
of aerodynamics.

I think the sweet spot they're talking about is basically the power band.
"JD" <jdcarroll@qwest.net> wrote in message
news:bc7ki0p7qqla7b7duukihoqa6v0jkuqsjq@4ax.com...
> Mike,
> You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
> a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
> the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .
>
> Thanks
> JD 2K-TJ
>
> There are some simple truths...And the dogs know what they are."
> Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

On Mon, 23 Aug 2004 21:04:38 GMT, "SB" <chicbearsmook@hotmail.com>
wrote:

>After the sweet spot talk....I can be in the sweet spot in my stock '02
>doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
>Which isn't a problem on the 400 highway here...but any benefit of being in
>teh sweet spot for gas efficiency got killed by the excessive speed and lack
>of aerodynamics.

That's what I was trying to figure out. I try to stay in the right
hand lane and do 55/60 mph. I figure that's where I'll get best
mileage on local freeway. Even in 4th gear I'm only turning 1900/2000
rpm.
I'm just wondering how much the 3.07 gears have to do with optimal
fuel consumption + RPM load VS say 456 or 488 gears and how to best
determine that sweet spot.

JD 2K-TJ

There are some simple truths...And the dogs know what they are."
Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

On Mon, 23 Aug 2004 21:04:38 GMT, "SB" <chicbearsmook@hotmail.com>
wrote:

>After the sweet spot talk....I can be in the sweet spot in my stock '02
>doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
>Which isn't a problem on the 400 highway here...but any benefit of being in
>teh sweet spot for gas efficiency got killed by the excessive speed and lack
>of aerodynamics.

That's what I was trying to figure out. I try to stay in the right
hand lane and do 55/60 mph. I figure that's where I'll get best
mileage on local freeway. Even in 4th gear I'm only turning 1900/2000
rpm.
I'm just wondering how much the 3.07 gears have to do with optimal
fuel consumption + RPM load VS say 456 or 488 gears and how to best
determine that sweet spot.

JD 2K-TJ

There are some simple truths...And the dogs know what they are."
Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

On Mon, 23 Aug 2004 21:04:38 GMT, "SB" <chicbearsmook@hotmail.com>
wrote:

>After the sweet spot talk....I can be in the sweet spot in my stock '02
>doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
>Which isn't a problem on the 400 highway here...but any benefit of being in
>teh sweet spot for gas efficiency got killed by the excessive speed and lack
>of aerodynamics.

That's what I was trying to figure out. I try to stay in the right
hand lane and do 55/60 mph. I figure that's where I'll get best
mileage on local freeway. Even in 4th gear I'm only turning 1900/2000
rpm.
I'm just wondering how much the 3.07 gears have to do with optimal
fuel consumption + RPM load VS say 456 or 488 gears and how to best
determine that sweet spot.

JD 2K-TJ

There are some simple truths...And the dogs know what they are."
Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

On Mon, 23 Aug 2004 21:04:38 GMT, "SB" <chicbearsmook@hotmail.com>
wrote:

>After the sweet spot talk....I can be in the sweet spot in my stock '02
>doing 115/120 in 4th...but I have to be doing 130kph in 5th to be in there.
>Which isn't a problem on the 400 highway here...but any benefit of being in
>teh sweet spot for gas efficiency got killed by the excessive speed and lack
>of aerodynamics.

That's what I was trying to figure out. I try to stay in the right
hand lane and do 55/60 mph. I figure that's where I'll get best
mileage on local freeway. Even in 4th gear I'm only turning 1900/2000
rpm.
I'm just wondering how much the 3.07 gears have to do with optimal
fuel consumption + RPM load VS say 456 or 488 gears and how to best
determine that sweet spot.

JD 2K-TJ

There are some simple truths...And the dogs know what they are."
Joseph Duemer

Re: Ping Mike Romain about RPM sweet Spot
 

On my 258, 2300 rpm or so seems to be a place where just a twitch of the
gas pedal is needed to keep the speed against wind or hills and the
pedal is about 1/4 way down.

I was told that is the area these engines reach their top timing advance
or maybe peak torque and any more is just pouring fuel at her to work
harder. It comes up to 2300 easy with a light pedal, higher means a lot
more pedal down. 2800 is 2/3 down, etc.

Hard to explain.....

I have owned 4 bangers with a sweet spot of 3300 rpm.

If I run in 5th gear at 65 with my 33's and 3.31 gears, I am turning
1600 rpm or so which lugs the engine. I have to use a 'lot' of gas
pedal to make adjustments for wind or hills. Hey, I have lots of power
to run at those rpm at 65 mph, but it comes down to the pedal needed.
Every time I have to floor it to hold against a gust of wind vs the
twitch needed in 4th, well.... This burns way more gas.

I can easily get an extra 4 or 5 mpg by staying in 4th gear on trips.

65 mph also seems to be a wind sweet spot for the CJ/Wranglers The
resistance is an exponential increase and getting up into the 70's,
well.... Just think on where your gas pedal is physically sitting to
figure your consumption.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

JD wrote:
>
> Mike,
> You speak about a RPM sweet spot for your Jeep at 2300 rpm. I've got
> a 2000 TJ with 30" tires and stock 3.07 rear end. How do you figure
> the sweet spot? I have to be doing 90 to maintain 23/2400 rpm .
>
> Thanks
> JD 2K-TJ
>
> There are some simple truths...And the dogs know what they are."
> Joseph Duemer