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Old 07-09-2010, 11:57 AM   #1
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Shifting - What is good?

My first Jeep - 2010 Wrangler Sport Mountain Edition

The gears (6 speed) seem to run longer than my old honda civic.

1. Wanted to hear some opinions regarding the RPM level to shift at that maximizes gas mileage and is best for the Jeep.

2. Also, during highway driving - what is a good RPM to cruise at?

Be well and thanks for helping a newbie-
Justin

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Old 07-09-2010, 12:23 PM   #2
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In my TJ, I usually shift around 3000RPM. In other cars you should shift at 3500, but I think Jeeps are a little different. Whenever I try to shift at 3500 in my Jeep, it gets really loud and does not sound very good.

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Old 07-09-2010, 12:25 PM   #3
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Quote:
Originally Posted by jkger View Post
My first Jeep - 2010 Wrangler Sport Mountain Edition

The gears (6 speed) seem to run longer than my old honda civic.

1. Wanted to hear some opinions regarding the RPM level to shift at that maximizes gas mileage and is best for the Jeep.
These questions will depend upon your gearing. I usually shift anywhere between 2K and 4K depending upon the required acceleration. As far as maximize MPG, you have an indicator in your 2010 that will light up (ECO ON) when you are driving in an economical manner.

Quote:
Originally Posted by jkger View Post
2. Also, during highway driving - what is a good RPM to cruise at?

Be well and thanks for helping a newbie-
Justin
Again it depends upon your gearing. I have 3.73 and with cruise control at 70 MPH, I'm at about 2350 - 2400 RPM.
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Old 07-09-2010, 03:51 PM   #4
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In any manual vehicle I've driven, I rarely watch the tach for when to shift. I go by how things sound/feel as to when I shift.
If I need to take off hard and fast, I'll wind it out a bit. If I'm in no hurry, I shift when it sounds like the engine isn't giving much more power.

Comparing how a Jeep runs to how a Civic runs is.... well.... No comparison.
Two totally different breeds of vehicles.
That's like comparing how a dirtbike runs as compared to a knee scraper.
They just ain't the same, so don't expect it to be similar in any way, shape or form.
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Old 07-09-2010, 03:52 PM   #5
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whatever feels right.
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Old 07-09-2010, 03:57 PM   #6
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I have the straight six and i shift at around 2300. if im accelerating harder ill do it at 3500.
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Old 07-09-2010, 04:55 PM   #7
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Quote:
Originally Posted by HyperBuzzin View Post
In any manual vehicle I've driven, I rarely watch the tach for when to shift. I go by how things sound/feel as to when I shift.
If I need to take off hard and fast, I'll wind it out a bit. If I'm in no hurry, I shift when it sounds like the engine isn't giving much more power.

Comparing how a Jeep runs to how a Civic runs is.... well.... No comparison.
Two totally different breeds of vehicles.
That's like comparing how a dirtbike runs as compared to a knee scraper.
They just ain't the same, so don't expect it to be similar in any way, shape or form.
I was the same way before the JK. The 3.8 is so damn quiet it's nearly impossible to go by sound. There have been times that I've been distracted and was out around 4-5K RPM without realizing it. It's that quiet.
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Old 07-09-2010, 05:13 PM   #8
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Wow, I shift at 1500 - 2000 depending on if I'm going up hill or not is my engine just super powerful?
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Old 07-09-2010, 07:08 PM   #9
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Originally Posted by daggo66 View Post
I was the same way before the JK. The 3.8 is so damn quiet it's nearly impossible to go by sound. There have been times that I've been distracted and was out around 4-5K RPM without realizing it. It's that quiet.
I agree - it is the quietness that threw me a bit - around traffic circles I'll hit 4K RPM without a thought when distracted by music, the sights, or the good sights-

It seems that between 3K and 4K RPM is standard - thanks for all the input.

It's sunny here and the top is down and the doors are off-

Justin
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Old 07-09-2010, 10:24 PM   #10
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Quote:
Originally Posted by VVCG33 View Post
In my TJ, I usually shift around 3000RPM. In other cars you should shift at 3500, but I think Jeeps are a little different. Whenever I try to shift at 3500 in my Jeep, it gets really loud and does not sound very good.
He's got a JK with th 3.8.
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Old 07-10-2010, 06:24 AM   #11
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I find that the JK has no ability to accelerate uphill if you are running anything below 1800 or so. I tend to shift at 2500+, higher RPM if you are trying to accelerate briskly. The torque on the 3.8L comes at significantly higher RPM than on the straight 6 4.0L.

As far as fuel economy, just experiment. My best guess is to run in as high a gear as you can while maintaining your speed. On the interstate that usually works out to 6th on flat stretches, 5th on moderate hills, and lower gears when it gets steeper.

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