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Old 04-25-2013, 11:33 AM   #1
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Need more power!! 3.8 auto/3.73 with 33's HELP PLZ

Have a 2011 JKU...love it. BUT NEED MORE POWER

Daily driver...little to no off-road...plz help.

-DO NOT want to re-gear, change my 33's, buy a 2012, or install a HEMI.!?!?

- Chip / programmer?? what kind??
-Exhaust & intake?? will they really work??

- plz help...

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Old 04-25-2013, 11:43 AM   #2
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You just said you don't want to do the stuff that actually works.

A regear is your most basic option. A supercharger and headers would be after that for considerably more coin.

Chips, intakes, and exhausts make marginal to no change and won't be worth your time or cash in terms of giving you more power.

Sorry.

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Old 04-25-2013, 11:57 AM   #3
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If you do tuner, exhaust, and intake at best you will get 10hp at 5000 rpms which realistically gives you 2 to 3 hp at normal driving range and will cost you half as much as a good re-gear which will improve performance a whole lot better to where you will actually notice. At best all the above will do is make you say, I think I feel a difference. I spent so much it had to do something didn't it. Jeep already pushed the 3.8L to it's max already and there was just not any room for improvement. At least any that matters.

This has been proven with dynos over and over again that tuners, exhaust, and intakes do very little in real numbers. The fact is, that in normal driving rpms, the hp range sucks. What re-gearing does is pushes the rpm range upwards for a given speed, putting the Jeep in a much better power band for the motor.
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Old 04-25-2013, 12:00 PM   #4
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Quote:
Originally Posted by rics1997 View Post
What re-gearing does is pushes the rpm range upwards for a given speed, putting the Jeep in a much better power band for the motor.
Yup. Regearing effectuates an actual, mechanical change. That works.

A tuner that tinkers with some bit of programming on a motor design that's 20+ years old? Intakes/exhausts that allow more airflow when airflow wasn't restricted to begin with? Not going to work . . . or at least not going to work much.
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Old 04-25-2013, 12:07 PM   #5
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Happy with my Superchips and 35's. I do drive a manual though. As mentioned gearing is huge with the pre 12 autos.
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Old 04-25-2013, 12:36 PM   #6
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Regear for actual acceleration improvement that is significant. At least , that is what all the local guys tell me about improving the acceleration. Actual power improvement that makes a big difference- can't do much besides putting in a Supercharger.
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Old 04-25-2013, 12:36 PM   #7
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I recently re-geared from 3.73 to 5.13 in my 2010 2DR with 3.8L. I've got the "35in" Duratracs.

It made a big improvement. I feel like I've got the power back that I lost when going to bigger, heavier tires/wheels.

I spent around $550 for the master gear kit and another $500 for the install.
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Old 04-25-2013, 07:35 PM   #8
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alright gearing sounds like the only answer....NOW....which to go with??

My only complaint really is when at freeway speed and hitting even just a slight incline. The rig slows way down...I then have to put my foot in it to get the tranny to down shift to keep my speed up.

Went over the mountain pass yesterday...that was eye opening too!!

which gearing will effect my MPG the least...remember DAILY DRIVER

thnx bro's
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Old 04-25-2013, 07:52 PM   #9
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Quote:
Originally Posted by bcummings View Post
alright gearing sounds like the only answer....NOW....which to go with??

My only complaint really is when at freeway speed and hitting even just a slight incline. The rig slows way down...I then have to put my foot in it to get the tranny to down shift to keep my speed up.

Went over the mountain pass yesterday...that was eye opening too!!

which gearing will effect my MPG the least...remember DAILY DRIVER

thnx bro's
You have an auto transmission, I assume? And a 4 door? With 33" tires?

If so, I'd say 4.56s or 4.88s for a daily driver.
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Old 04-25-2013, 09:26 PM   #10
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what can I expect as far as MPG effects
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Old 04-25-2013, 09:52 PM   #11
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Originally Posted by bcummings View Post
what can I expect as far as MPG effects
Depends.

If you spend most of your time now doing "around town" driving, or if you spend most of your time now on the highway but the jeep downshifts a lot, you could see an improvement with a regear.

If on the other hand you spend a lot of time now on the highway and the jeep hardly ever downshifts, it might drop some with a regear.

Probably more likely to drop with 4.88s than 4.56s I'd guess.

Hard to say for sure--individual results vary. You're balancing "the jeep is better placed in the power band and therefore is more efficient and lugs less" (good for mileage) versus "the jeep is running at higher RPMs a lot" (bad for mileage).

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