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Old 07-28-2009, 04:15 AM   #1
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need more power to my 2.5L

barely getting over the mountains here on oahu. wanna run 33's with a lift, so what kinda power mods will help? gearing?

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Old 07-28-2009, 06:58 AM   #2
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Gearing should help quite a bit. I also saw an increase in getty-up when I went to a Flowmaster and aftermarket air filter with a better flow.

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Old 07-28-2009, 07:12 AM   #3
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I have a Eaton blower and installation kit I could sell you....BUT its for a 4.0L =( I wont be able to use it anytime soon due to not enough cash flow to start a new project for myself.

I agree with Ironman, re-gearing, exhaust, and a cold air intake will help out for sure. Other than that....a supercharger kit or an engine swap to the 4.0L are the only other paths to take I think.
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Old 07-28-2009, 10:19 AM   #4
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your in kailua? was born and raised in hawaii. i used to live hawaii kai and wheel in waimanalo, kailua, and allen davis(behind the makapuu lighthouse) also kaena point. anyway, ive got a 2.5 and 33's and i regeared to 4.88:1 and it really helped. but its still a 4 banger, so youll still be downshifting to go up hills. offroad,though, the 4 works great!
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Old 07-28-2009, 10:24 AM   #5
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cmikel has a blower and i got a spare 4.0 block with cam and crank
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4 banger costum buid project
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Old 07-28-2009, 10:27 AM   #6
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Your Jeep's gearing is the issue now that you've gone to 33" tires. Regearing to 4.88 is the appropriate remedy and is really the only remedy that's going to work. Even if you installed a supercharger, the inappropriate gear ratio in your axles will still make it struggle against the gearing ratio which is now too high. Regearing isn't cheap at $1100-1300 typically but it's the only sure-fire fix for your 33" tires. And not 4.56 which is approprate for a 4.0L engine, you need 4.88 because of your 2.5L engine.

No amount of inexpensive other types of mods like headers, air intakes, bigger throttle bodies etc. are going to do anything but lighten your wallet.
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Old 07-28-2009, 12:48 PM   #7
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awesome, thanks for the input guys. i got a friend that will pretty much give me a 4.2L with a four speed (dont know which one) and a dana 300 transfer case for free! only problem is that with the d300 my drive shafts wont line up. does any one know if there is some kind of adapter that will correct this? and is the 4.2 a good swap or should i look for a 4.0?
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Old 07-28-2009, 12:50 PM   #8
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i would actually be stoked if i could find a 4.3L vortec!
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Old 07-28-2009, 12:51 PM   #9
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hey jeeps-r-us, what are you doin in texas?
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Old 07-28-2009, 12:58 PM   #10
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Originally Posted by SASA-1 View Post
awesome, thanks for the input guys. i got a friend that will pretty much give me a 4.2L with a four speed (dont know which one) and a dana 300 transfer case for free! only problem is that with the d300 my drive shafts wont line up. does any one know if there is some kind of adapter that will correct this? and is the 4.2 a good swap or should i look for a 4.0?
A 4.2L engine is not a good upgrade, go for the 4.0L. The 4.2L is carbureted (a PITA, especially since carb'd engines tend to stall on steep climbs) and doesn't put out near the HP or torque the fuel injected 4.0L does.
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Old 07-28-2009, 01:01 PM   #11
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the thing about swaps like that, is that they lead to a whole lot more than just a engine/tranny/transfer case swap. they can be done, but its a whole lot easier/cheaper to sell what youve got and get what you want. with the drive shafts not lining up with your front or rear, you would have to replace the front and rear axles to a different offset(left/right). the engine will also require a different computer/controller. plus a bunch of fabrication. the 4.0 would be easier, but still require more than just motor and tranny. but if money is no object do the hemi/ diesel conversion! that would ROCK!
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Old 07-28-2009, 01:07 PM   #12
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hey jeeps-r-us, what are you doin in texas?
moved up here to help my mom get settled in after my dad died, got married, and just never got a chance to come back. someday maybe. check out advanced adapters for engine swap stuff. what year is your jeep? the old cj's are a lot easier to swap in chevy stuff. Network Solutions E-Commerce Web Site - Home
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Old 07-28-2009, 06:54 PM   #13
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sorry to hear bout ur dad. thanks for the advice!
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Old 07-28-2009, 08:11 PM   #14
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Originally Posted by Jerry Bransford View Post
No amount of inexpensive other types of mods like headers, air intakes, bigger throttle bodies etc. are going to do anything but lighten your wallet.
This is part of an article from the JP website that would tend to disagree with this statement.


August 2006, P. 72

Simple 4.0L Breathing
Power Play Combo: Edge Trail Jammer Compete 4.0L System

When it came time to upgrade the power level on Jp's project steal-J wrangler, we had no desire to crack into the stock, undamaged exhaust system.

Rather, we concentrated our efforts on the intake and fuel side of the equation. Edge product's trail Jammer system utilizes a highflow, cold-air intake, a bored 62mm throttle body, and an electronic control module that increases the fuel delivery to complement the engine's ability to draw more air. the results in drivability and mileage were welcome additions, with gains of 15 hp and an increase in mileage of 1.3 mpg.



Vehicle Specs:
1997 TJ wrangler sport
4.0L
TF999 auto transmission
3.07 gears
30-inch tires
Power Gains:
stock: 126 hp, 171 lb-ft*
Modified: 141 hp, 181 lb-ft*
*Note - numbers taken at rear tires

Sources:
Edge Products
888/360-3343
edgeproducts.com



December 2004, P. 32

YJ Wheezer Squeezing

Back in 2004, tech editor hazel suddenly found himself the owner of a cheap, 100K-mile '95 yJ with a good-running 2.5l and an aX-5 tranny.

It was quiet, economical, and comfortable to drive, so naturally he modded the hell out of it until it was loud and uncomfortable. here's the power play and dyno numbers from the engine modification installment of the buildup. while it's impressive that we actually raised horsepower by 14 percent, the power came on at a much higher rpm and driveability actually suffered. in reality, it was a nicer-driving vehicle with the stock drivetrain. live and learn.

Power Play Combo:
Flex-a-lite electric fan, pn 475
Banks torquetube header
Banks stinger exhaust random technolgies high flow catalytic converter,pn 822201
Stock 58mm 4.0l throttle body
AEM Brute Force air intake and filter



Vehicle Specs:
1995 YJ wrangler
2.5L
AX-5 transmission
4.10 gears
29-inch tires
Power Gains:
stock: 100 hp, 121 lb-ft*
Modified: 114 hp, 128 lb-ft*
*Note - numbers taken at rear tires

Sources:
AEM
310/484-2322
aempower.com

Banks
800/601-8069
bankspower.com

The Dyno Shop
619/562-3933
thedynoshop.com

Flex-A-Lite
800/851-1510
flex-a-lite.com

Random Technology
770/554-4242
randomtechnology.com
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Old 07-28-2009, 08:25 PM   #15
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Originally Posted by Ironman View Post
This is part of an article from the JP website that would tend to disagree with this statement.
What not everyone understands however is that magazines like Jp will never find anything but good to say about their advertiser's products. Another thing that few realize is that dynometer results are so variable that it's hard to get similar readings even when testing the same configuration multiple times. The percentage gains they always seem to show are always well within a dynometer's margin of error.

In other words, they can make a dynometer show pretty much anything they want it to. I even watched a TV ad touting a HP gain with some gizmo and they showed the dyno as they ran the tests. What they apparently didn't catch but was clear on TV in the background was that the dynometer's tachometer indicated the engine was running at a slightly higher RPM when it showed slightly improved HP after the gizmo was installed. Not many would have caught that but I did.

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