Severe Power Loss - JeepForum.com

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post #1 of 53 Old 11-09-2010, 02:46 PM Thread Starter
mthomp83
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Severe Power Loss

So I have the 2010 rubi with AEV 3.5" premium kit and 35" tires. The transmission is automatic w/ 4.10 gears.

I went camping this weekend in the North GA mountains and I had a severe loss of power when on the hills leading to the camp site. It literally felt like it was going to cut off on me a few times when going up hill.

I know it goes without being said that I will lose some power due to turning larger tires but I didn't expect it to be this much.

Has anyone experienced sever power loss when driving up hills or elevations with 3.5" and 35's?

Any suggestions for a remedy?


2010 JK Rubicon - Flame Red - 3.5" AEV Premium Suspension Lift w/ Bilstein 5100 Shocks, 17" AEV Savegre Wheels, 35x12.50 r17 BFG KM2's - Rugged Ridge XHD Modular Front Bumper w/ 10,500lb Winch - Rugged Ridge XHD Rear Bumper w/ Swing Out Tire Carrier - Poison Spyder JK Evap Skid Plate - KC Slimlite Long Range
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post #2 of 53 Old 11-09-2010, 02:57 PM
Prot
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Put 5.13 gears in it. Problem solved. Millions of threads about it.

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Too many mods to list. Too awesome to sell.
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post #3 of 53 Old 11-09-2010, 03:13 PM
paul84043
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Was this a step function loss, or was it the first time you'd taken it out with the 35's?
I put 33's on our Wrangler Unlimited Sport and it's no speed demon, but still does okay... I don't want to damage out DD capability, so was thinking about 410's, but if you've got a Rubicon, you already have 410's...hmmmmmmm. ?
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post #4 of 53 Old 11-09-2010, 03:15 PM Thread Starter
mthomp83
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Quote:
Originally Posted by paul84043 View Post
Was this a step function loss, or was it the first time you'd taken it out with the 35's?
I put 33's on our Wrangler Unlimited Sport and it's no speed demon, but still does okay... I don't want to damage out DD capability, so was thinking about 410's, but if you've got a Rubicon, you already have 410's...hmmmmmmm. ?
this was the first time that i have taken it to higher elevations than my regular driving has taken me with 35's.

i have definitely noticed power loss after putting the 35's on but it really is fine around time

i just wasn't sure it it was the gearing that was the problem or the engine

2010 JK Rubicon - Flame Red - 3.5" AEV Premium Suspension Lift w/ Bilstein 5100 Shocks, 17" AEV Savegre Wheels, 35x12.50 r17 BFG KM2's - Rugged Ridge XHD Modular Front Bumper w/ 10,500lb Winch - Rugged Ridge XHD Rear Bumper w/ Swing Out Tire Carrier - Poison Spyder JK Evap Skid Plate - KC Slimlite Long Range
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post #5 of 53 Old 11-09-2010, 03:22 PM
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An injected engine shouldn't suffer too much from altitude sickness, but I guess you never know. What tire/size did you put on?

Also, I have a standard, I hear that it delivers a little more oomph than the auto.

When you got back down did everything feel normal again?
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post #6 of 53 Old 11-09-2010, 03:30 PM
chickenhawk7
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I have 35s the AEV lift and I noticed loss of power, but nothing severe. I trail ride but not in high elevations but have never experienced severe power loss. I think you might have other issues other than having to regear. If you noticed this going up hills on the road then it could just be the gearing.
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post #7 of 53 Old 11-09-2010, 04:21 PM
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shoulda done some homework--

3.5" lift TOO-MUCH, soon front driveshaft boot loss, soon universal loss-

Why 35" don't need 35" and with 4.10 gears=speedo off,mileage off, odometer off-

You'll have to either regear/get rid of 35"/ get auto tranny aux cooler and get either AEV Procal Module or "superchip"

Not much else you can do--nothing for the engine !!

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post #8 of 53 Old 11-09-2010, 04:37 PM
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What is a higher elevation? To me that's 11,000 feet. I know GA doesn't have those mtns. You'll loose about 15% of your power for every 5,000 ft.
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post #9 of 53 Old 11-09-2010, 05:28 PM
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Quote:
Originally Posted by JIMBOX View Post
Why 35" don't need 35" and with 4.10 gears=speedo off,mileage off, odometer off
The lift the OP is running (an AEV Premium) comes with an AEV ProCal included.
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post #10 of 53 Old 11-09-2010, 05:30 PM
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Quote:
Originally Posted by cbloyer81 View Post
What is a higher elevation? To me that's 11,000 feet. I know GA doesn't have those mtns. You'll loose about 15% of your power for every 5,000 ft.
Alpharetta GA (Atlanta) 1135 foot elevation.

Highest point in the state = Brasstown Bald 4787 feet.

I agree with everyone else, more than likely gearing.

Modern fuel injection will easily handle a 3k foot elevation difference.


Or you got some not so good gas...
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post #11 of 53 Old 11-09-2010, 05:35 PM
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OOPs, however, he probably never utilized it for the reasons it's programed--


Quote:
Originally Posted by aristobrat View Post
The lift the OP is running (an AEV Premium) comes with an AEV ProCal included.
I have and it's made all the difference in the world with my JKU and Auto tranny/power/shifting/speedo-etc

He's gotta say something-otherwise were just wasting our time !!

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post #12 of 53 Old 11-09-2010, 06:21 PM
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I'm in Utah, 4300(ish) ft, so to me high elevation is 11000, to 14000 ft (Guardsmans pass). We have property at 8000 and I've never noticed any loss at all in any injected vehicle driven there, or anywhere up to the approx 10,500 that we encounter hunting.....I really wonder if there's not something else going on....
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post #13 of 53 Old 11-09-2010, 06:50 PM Thread Starter
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Quote:
Originally Posted by paul84043 View Post
When you got back down did everything feel normal again?
yea everything was back to normal when i got back to normal elevations,actually there were not any changes unless it was going up a very steep hill

i see that people are questioning the elevations and you are right, there is only about a 3k elevation difference thats why i wasn't sure

and yes, i did use the procal module

for anyone questioning if i did my "homework" or not, trust me...i did

2010 JK Rubicon - Flame Red - 3.5" AEV Premium Suspension Lift w/ Bilstein 5100 Shocks, 17" AEV Savegre Wheels, 35x12.50 r17 BFG KM2's - Rugged Ridge XHD Modular Front Bumper w/ 10,500lb Winch - Rugged Ridge XHD Rear Bumper w/ Swing Out Tire Carrier - Poison Spyder JK Evap Skid Plate - KC Slimlite Long Range
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post #14 of 53 Old 11-09-2010, 07:06 PM
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GOOD, don't be offended by my statements, I really expected you to respond--and you did, but


Quote:
Originally Posted by mthomp83 View Post
yea everything was back to normal when i got back to normal elevations,actually there were not any changes unless it was going up a very steep hill

i see that people are questioning the elevations and you are right, there is only about a 3k elevation difference thats why i wasn't sure

and yes, i did use the procal module

for anyone questioning if i did my "homework" or not, trust me...i did
You say you used the Procal Module !!---HOW

I've got a surprise for you if you answer me as I expect, please tell what you did with the Module !!

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post #15 of 53 Old 11-09-2010, 07:12 PM Thread Starter
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i set the procal module for the appropriate tire size which supposedly fixed the speedo, odo, and adjusted the automatic transmission shift points

i tested the speeds with my gps and they seem to be reading correctly

i think that my next upgrade will be gears....

2010 JK Rubicon - Flame Red - 3.5" AEV Premium Suspension Lift w/ Bilstein 5100 Shocks, 17" AEV Savegre Wheels, 35x12.50 r17 BFG KM2's - Rugged Ridge XHD Modular Front Bumper w/ 10,500lb Winch - Rugged Ridge XHD Rear Bumper w/ Swing Out Tire Carrier - Poison Spyder JK Evap Skid Plate - KC Slimlite Long Range
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