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Old 11-22-2010, 02:16 PM   #1
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High RPM's?

I bought a jeep around the beginning of this previous summer. It is a 99 se with 2.5 cyl 5 speed, completely stock. Around town the rpms are perfectly fine but as soon as i get on an interstate/highway, they seem to be really high. 70 mph in 4th gear is around 4k rpms. 70 mph in 5th gear is around 3200 rpms. I can only get the jeep to go 80 mph and thats in 5th gear on a steep hill. If i hit the slightest incline i lose a lot of power and have to downshift. Why do i not have power in higher gears/speeds and why are the rpms so high?

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Old 11-22-2010, 02:19 PM   #2
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Because you have four banger! Honestly, do you really need to go over 80mph in a JEEP?

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Old 11-22-2010, 02:39 PM   #3
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↑ Yep, thats just the way a 4cyl runs
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Old 11-27-2010, 10:42 PM   #4
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yea that'll happen my 4 banger runs around 5.5k rpms goin 80
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Old 11-27-2010, 10:50 PM   #5
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you drive a Jeep not a Lambo. Stick that needle on the speed limit and just cruise.
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Old 11-27-2010, 10:58 PM   #6
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↑ Yep, thats just the way a 4cyl runs
X2

I only did 70 once and them numbers are right on
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Old 11-27-2010, 10:59 PM   #7
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Couldnt an adjustment to gearing help? Maybe even a custom transmission can help lower the RPMs with taller gears?
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Old 11-27-2010, 11:33 PM   #8
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The only thing I was worried about is if it has a negative effect on mileage. It's my first time owning or driving a manual, but having 3k rpms going 70mph in 5th seems like I'd be outta gas in no time.
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Old 11-28-2010, 07:33 AM   #9
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My old 4cyl sounded like a chainsaw at highway speeds. Think about it, 4cyls on 4.10 gears, going 70mph.....

And yes you're right, jeeps have horrible gas mileage. I had to fill mine up at least every 3 days, and still do with my 6 cyl
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Old 11-28-2010, 12:20 PM   #10
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thats jeeps way of keeping your billboard of a car from blowing away.... 80 in a jeep is scary
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Old 11-29-2010, 12:56 PM   #11
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Quote:
Originally Posted by surfskate21 View Post
I can only get the jeep to go 80 mph and thats in 5th gear on a steep hill. If i hit the slightest incline i lose a lot of power and have to downshift. Why do i not have power in higher gears/speeds and why are the rpms so high?
Perhaps you should have purchased a fast sleek car with a nice big engine if you want to drive at 80mph. This is a Jeep and driving at that speed seems like something that should not be done.
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Old 11-29-2010, 01:13 PM   #12
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70mph is as fast as I go in my jeep. I'm sure it will go faster (6cyl) but I'm jeep'n not race'n.
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Old 11-29-2010, 01:30 PM   #13
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Because you have four banger! Honestly, do you really need to go over 80mph in a JEEP?
It's ok they are well on the way to a Darwin Award

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