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Old 02-06-2012, 08:30 PM   #1
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More Power!!!!!!

Does anyone have any advice on what I can do to my stock engine to get some more horsepower. I'm fine on trails and backroads but the highway and hills kill me. Please help

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Old 02-06-2012, 08:35 PM   #2
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regearing is very important after going to larger tires...even with more horsepower you still need to regear.

if properly geared for the tire size & transmission, then your at internal engine work to gain horsepower. head porting, performance cam, stroker (4.2L crank with 4.0L rods + custom pistons + head porting + cam), or forced induction (turbo, supercharger). if you have a 97-04, you'll also need a piggyback ECU to get the tune right, since the stock PCM cannot be reflashed. I've heard the 05-06 PCM's can be reflashed by a tuner shop. Piggybacks that do this include the Unichip and the SplitSecond FTC-1. engine swaps are also an option, V8, diesel, etc. stay away from so called cold air intakes, headers, and programmers/chips...all pointless.

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Old 02-06-2012, 08:36 PM   #3
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Does anyone have any advice on what I can do to my stock engine to get some more horsepower. I'm fine on trails and backroads but the highway and hills kill me. Please help
What engine, what size tires, and what transmission do you have?
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Old 02-06-2012, 08:37 PM   #4
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I'm starting to really hate this question..lol
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Old 02-06-2012, 08:42 PM   #5
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Sell it and buy a mustang
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Old 02-06-2012, 08:46 PM   #6
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Sell it and buy a mustang
He wants MORE power.....
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Old 02-06-2012, 08:52 PM   #7
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Sorry if I'm gettin on yalls nerves but I have little to no clue about these kinda things. I've got 32 tires with the stock v6 engine off the lot
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Old 02-06-2012, 09:03 PM   #8
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Ouch a V6, how did that happen? Thats you problem right there..someone stole your 4.0l and stuck a pos v6 in there..
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Old 02-06-2012, 09:07 PM   #9
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So I pretty much need an entire under the hood change
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Old 02-06-2012, 09:10 PM   #10
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So I pretty much need an entire under the hood change
No man. You just need to re-gear or go back to stock size tires. Its the 32's that is zapping your power.
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Old 02-06-2012, 09:11 PM   #11
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Yeah I figured the tires were killing me. But man i can't go back to stock hahaha
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Old 02-07-2012, 01:04 AM   #12
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just kidding with ya Bradley22... listen to the above comments about re-gearing. i'm getting ready to start my re-gearing plan this summer...hopefully... if that doesnt work then you can always think about a 4.7 stroker down the road. do a internet search on it and you will get a lot of info
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Old 02-07-2012, 08:19 AM   #13
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stay away from so called cold air intakes, headers, and programmers/chips...all pointless.


Just remember this quote whenever you get the itch for more power. "Breath mods" (as these are called) made to stock, normally aspirated motors offer horrendously bad value for your dollar.

Unfortunately, the industry has made a ton of $$$ off people looking for a cheap (relatively) increase in power. Add to that all those who were suckered in, but feel the need to defend their purchases with "butt dyno" testimonials... sometimes it's very diffecult not to be sucked in.
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Old 02-07-2012, 08:54 AM   #14
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Regear, go back to smaller tires, or do an engine swap for a V8 or diesel.
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Old 02-07-2012, 11:12 AM   #15
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Sorry if I'm gettin on yalls nerves but I have little to no clue about these kinda things. I've got 32 tires with the stock v6 engine off the lot
I've got a simple suggestion for you, which will be a learning experience. pop open the hood and look at the engine. look carefully to see if the engine is really in a V configuration. check the oil and air filter while you're in there, thats always good practice.

For reference, 6-cylinder TJ's came with a 4.0L AMC derived Inline-6.

You still didn't answer the question of what transmission you have. Auto, manual? what year is your Jeep?
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Old 02-07-2012, 11:21 AM   #16
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You still didn't answer the question of what transmission you have. Auto, manual? what year is your Jeep?
This. Also, where in the country are you? Maybe you can find a local friend on here who can help introduce you to the ins and outs of our hobby.
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Old 02-07-2012, 11:43 AM   #17
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Wow this is awesome how much info y'all are sending. I have heard cold air intakes will help but I'm also kinda Leary about them. I also heard a fella mention a chip to reprogram the jeep to use less gas.

My jeep is an 2005 automatic transmission. I'm only in my first year of college and looking I guess u can say "cheaper" way of getting more power without giving up my tires.

Thanks again to all of y'all helping out.
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Old 02-07-2012, 11:46 AM   #18
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Quote:
Originally Posted by Bradley22
Wow this is awesome how much info y'all are sending. I have heard cold air intakes will help but I'm also kinda Leary about them. I also heard a fella mention a chip to reprogram the jeep to use less gas.

My jeep is an 2005 automatic transmission. I'm only in my first year of college and looking I guess u can say "cheaper" way of getting more power without giving up my tires.

Thanks again to all of y'all helping out.
The only solution is to regear, especially with your 42rle. The 4 speed auto wasn't even geared right from the factory with 30x9.5 tires.
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Old 02-07-2012, 11:48 AM   #19
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Ok so can I do the re gearing myself or should I take it to someone who really knows the ins an outs to jeeps
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Old 02-07-2012, 11:53 AM   #20
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i installed a cold air intake and it added more power

QUOTE=Bradley22;2001927]Does anyone have any advice on what I can do

to my stock engine to get some more horsepower. I'm fine on trails and backroads but the highway and hills kill me. Please help[/QUOTE]
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Old 02-07-2012, 11:54 AM   #21
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Ok so can I do the re gearing myself or should I take it to someone who really knows the ins an outs to jeeps
considering you have a "v6", i would definitely suggest taking the Jeep to a professional for a regear. here's an example of a regear: http://www.pirate4x4.com/articles/te...sta/Gear_Setup

A regear typically costs about $1200-1800 depending on location and parts chosen. if you want to install lockers or LSD's, regearing is the time to do that...which adds additional parts costs.

For your 42RLE auto with 32s, you'll want 4.56 gears. The rear axle will need a new carrier, or you can buy "thick" gears to keep the stock Trac-Lok. If you reuse your stock Trac-Lok, have it rebuild with new clutches while it's out, which will add another few hundred bucks. You need to buy a speedometer gear to correct for any change in tire size and gearing.

The 42RLE is undergeared from the factory. It needs 4.88s for 33s, 5.13s for 35s, etc. So if you plan to get larger tires in the future, you'll need to regear again or factor that somehow into your plans.

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i installed a cold air intake and it added more power
Cool, how much exactly? Post up the pics of the dyno graphs with before and after results to prove the statistical difference.
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Old 02-07-2012, 11:57 AM   #22
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Ok so defin. more than what I can spend at the moment. I'll still be checking in on it. Thanks to all of yall
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Old 02-07-2012, 11:58 AM   #23
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Just remember this quote whenever you get the itch for more power. "Breath mods" (as these are called) made to stock, normally aspirated motors offer horrendously bad value for your dollar.

Unfortunately, the industry has made a ton of $$$ off people looking for a cheap (relatively) increase in power. Add to that all those who were suckered in, but feel the need to defend their purchases with "butt dyno" testimonials... sometimes it's very diffecult not to be sucked in.

I disagree with you on this. Breathing mods can help with mileage and power. In the long run you can save money. Plus some people do the breathing mods because the want the sound or to be unique.
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Old 02-07-2012, 12:09 PM   #24
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I disagree with you on this. Breathing mods can help with mileage and power. In the long run you can save money. Plus some people do the breathing mods because the want the sound or to be unique.
Not on a TJ wrangler. The stock breather gives your engine more than enough air. The stock header also is about as free flowing as it can get. There is no cheap way to get any gains out of a 4.0.
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Old 02-07-2012, 12:33 PM   #25
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Until you can afford a re-gear:

Press the OD "off" button after you start it, and run it like that.
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Old 02-07-2012, 01:13 PM   #26
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OD as in the over drive button?
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Old 02-07-2012, 01:42 PM   #27
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OD as in the over drive button?
Yes
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Old 02-07-2012, 01:48 PM   #28
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Why do you think your Jeep has a "V6" in it?
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Old 02-07-2012, 01:51 PM   #29
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Help the guy out don't poke fun at him.

All TJ's with the 6-cylinder have I6 4.0L engines.
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Old 02-07-2012, 01:58 PM   #30
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Breathing mods can help with mileage and power. In the long run you can save money. Plus some people do the breathing mods because the want the sound or to be unique.
That is rarely the case on most normally aspirated motors made since the mid/late 90's. Intakes & headers can provide minimal power increases at the far end of the rev range. And they are just as likely to reduce torque & HP in the more commonly used portions of the power band.

My personal opinion on loud intakes & exhausts: Off-roaders are facing increased "persecution" all over the country. Places to wheel are disappearing quickly. Noise pollution is a major contributor to many of those losses.

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