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Old 08-24-2009, 02:06 PM   #1
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Cheap HP

My 2.5 slower than a snail with a anchor tied to it needs some power booster but i am broke so i need to do it on the cheap Ideas

Remove Cat Converter and add a "test pipe" i know will pick up a few,
I also know drilling some holes in the air box (old corvette trick)

What else? Do they make a performance chip?

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Old 08-24-2009, 03:03 PM   #2
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high flow cat, high flow muffler, 4.0 throttlebody, maybe use a dremel in intake where throttle body mounts to remove excess metal, and remove intake restrictor from airbox. Dont drill holes in airbox, that sound is more annoying than an open exhaust.

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Old 08-24-2009, 04:35 PM   #3
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I've always heard, "you can't make a silk purse out of a sow's ear"!
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Old 08-24-2009, 05:48 PM   #4
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I've always heard, "you can't make a silk purse out of a sow's ear"!
so why not sell your jeep and buy unimog?
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Old 08-24-2009, 06:09 PM   #5
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Maybe because he has the 4.0 and it does what he wants it to do...

I'd be very interested in any provable performance gains to the anemic little 4 banger on the cheap. Most of the stuff that gets suggested is just feel good stuff that doesn't produce any kind of verifiable improvement.

The 4 banger is just under powered for the weight of a Wrangler.
Trade it in on a 6 banger, swap motors or go with forced induction.
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Old 08-24-2009, 07:01 PM   #6
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you can spend tons of money on it, and it still isn't gonna make you smile. its a great reliable engine that lasts forever, but i'll agree with skeeter.

and some may make a few hp difference, but you'll notice it only cuz you put it on, kinda like a sugar pill. but cold air intakes are not good at all for jeeps, and cutting out the cat isn't really legal, but if you don't have to pass emissions its one thing i guess.

i've owned 4 cyl's and 4.0's, i won't buy another 4 cyl.
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Old 08-24-2009, 07:18 PM   #7
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I'd be very interested in any provable performance gains to the anemic little 4 banger on the cheap. Most of the stuff that gets suggested is just feel good stuff that doesn't produce any kind of verifiable improvement.
Consumer Guide® Road-Test Evaluation
Acceleration and drivability are only adequate from the initial 6-cylinder engine; gas mileage mediocre. Meager is the word for acceleration from the 4-cylinder engine. Performance got a welcome boost from the fuel-injected six of 1991. Jeep claimed a 0-60-mph acceleration time of 9.7 seconds, versus 14.3 seconds for the old carbureted 6-cylinder engine.

using a gtech i timed mine at around 12.6 seconds 0-60 still slower than the 4.0 but faster than a 4.2 and mine will peg the speedo. Anyone in the PA,NJ,DEL area doesnt believe me is welcome to come for a ride.
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Old 08-24-2009, 07:35 PM   #8
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And yours is a? has had what done to it? at what cost?
And what did your numbers look like before the changes?
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Old 08-24-2009, 07:51 PM   #9
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And yours is a? has had what done to it? at what cost?
And what did your numbers look like before the changes?

94 2.5
no cat 10 dollar pipe
thrush muffler about 30 dollars
figure a couple clamps 5 dollars
used 4.0 throttlebody from yard 20 dollars
dremel intake 1.5 hours, free
remove airbox restrictor free

i cant give you before numbers because i didnt check but struggled to maintain highway speeds. 0-60 was what seemed like forever. i think i found specs before of around 17 seconds 0-60.

oh and i have slightly larger tires of 30x9.5 on factory steelies
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Old 08-24-2009, 08:04 PM   #10
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oh, i still get great gas mileage when i drive it conservatively.
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Old 08-24-2009, 08:09 PM   #11
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Cool I will give this a shot. Man this is sooooo much diffrent than my corvette.
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Old 08-24-2009, 08:25 PM   #12
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I'd be very interested in any provable performance gains to the anemic little 4 banger on the cheap. Most of the stuff that gets suggested is just feel good stuff that doesn't produce any kind of verifiable improvement.
i dont blame you if you dont believe since so much stuff on the internet is B/S but that is why i put out the offer to take a ride, i can prove i difference in performance on the cheap.
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Old 08-24-2009, 08:46 PM   #13
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It would be a little difficult for me to take a ride with you unless you'd like to drive out west a bit.
I'm not trying to suggest you're lying or even mistaken, you may well have achieved a considerable performance increase at the expense of smog compliance.
Unfortunately, without constants in the testing and a good baseline we can't know what you gained. It's all speculation without the before and after numbers. If you're happy with what you have then great. Unfortunately I spent too much time as a mechanic seeing people come in to the shop claiming awesome performance increases from their little tricks to believe anything without numbers to back it. As Doc said, the placebo effect is amazing.

I drove a 4 banger for awhile and tinkered with it some but my wifes 4.0 would smoke it hands down and the lack of performance on the highway drove me nuts so I sold it.
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Old 08-24-2009, 09:35 PM   #14
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I will agree the 2.5 is alot slower than the 4.0 and that without baselines there is nothing conclusive but i know i couldnt go over about 65-70 mph before where now i can top it out and right from a start i can stay with traffic rather than hold it back.
placebo, doesnt explain raising my top speed by 30mph.
emissions compliance is for tree huggers, if we gave them everything you wouldnt be able to ride trails for fear of treading over a rare spotted mudpuppy salamander and instead would be driving a prius. i give them the finger and ill beat one with a cataltic converter.j/k
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Old 08-24-2009, 09:40 PM   #15
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i got my airbox open here and i need to know what to cut and do to it.....any help here?
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Old 08-25-2009, 06:02 AM   #16
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i got my airbox open here and i need to know what to cut and do to it.....any help here?
Where the intake hose connects to the airbox, there is a tube inside the opening. youll probably need a screwdriver for prying a little and a pair of plyers for pulling it out.
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Old 08-25-2009, 08:56 AM   #17
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here are some numbers to consider based on weight and hp and speed only.

The avg TJ 4 cly is 3200lbs
The avg TJ 6Cly is 3500lbs

The 4 cly needs 41.5hp to reach 55mph
The 6 Cly needs 45.4hp to reach 55mph

The 4cly needs 153hp to reach 85mph
The 6cly Needs 167.7 hp to reach 85mph

While the 6 can clearly get to highway speeds and beyond, the 4 does not have the power band to.
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Old 08-25-2009, 09:07 AM   #18
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here are some numbers to consider based on weight and hp and speed only.

The avg TJ 4 cly is 3200lbs
The avg TJ 6Cly is 3500lbs

The 4 cly needs 41.5hp to reach 55mph
The 6 Cly needs 45.4hp to reach 55mph

The 4cly needs 153hp to reach 85mph
The 6cly Needs 167.7 hp to reach 85mph

While the 6 can clearly get to highway speeds and beyond, the 4 does not have the power band to.
ya, i don't know of many 4 cyl's w/ 153 hp. that would have to be a gain of what, at least 30 hp right?
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Old 08-25-2009, 09:35 AM   #19
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ya, i don't know of many 4 cyl's w/ 153 hp. that would have to be a gain of what, at least 30 hp right?
30hp or more I would guess.

Here is a link to the calculator.

Horsepower Design Equation Formula Calculator - Engine Horsepower Trap Speed Method
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Old 08-25-2009, 10:23 AM   #20
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i think the 2.5 is right at 120 hp out of the box.
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Old 08-25-2009, 10:24 AM   #21
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i think the 2.5 is right at 120 hp out of the box.

I want to say the last year it had close to 150hp but I can't say for sure...
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Old 08-25-2009, 10:31 AM   #22
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definitely put the 4.0 throttle body on. I am very happy that I did.

I found that drilling out the box and removing the air restrictor makes acceleration doggy. Top end was fine but I ended up putting everything back stock and I like it better that way.

The bottom line is that it is a 2.5L. It is a great engine for around town, trail, and modest highway driving. Yeah, you can do things to it and wake it up a little bit, but it will never be a powerhouse.

as for the cutting the cat, does this help at all? I'm all for the environment but I wouldn't feel bad cutting it considering all the antique vehicles, 2 stroke jet skis, lawnmowers, etc that pollute already
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Old 08-25-2009, 12:17 PM   #23
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emissions compliance is for tree huggers,
And for people with children with asthma that have had to be rushed to the hospital more than once...
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Old 08-25-2009, 12:36 PM   #24
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So how does the 4.0 throttle body fit on the 2.5? also what exactly do you use the drimmel on?
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Old 08-25-2009, 04:57 PM   #25
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here are some numbers to consider based on weight and hp and speed only.

The avg TJ 4 cly is 3200lbs
The avg TJ 6Cly is 3500lbs

The 4 cly needs 41.5hp to reach 55mph
The 6 Cly needs 45.4hp to reach 55mph

The 4cly needs 153hp to reach 85mph
The 6cly Needs 167.7 hp to reach 85mph

While the 6 can clearly get to highway speeds and beyond, the 4 does not have the power band to.

clearly that calculation is wrong since i can go much faster than 85mph and i know i didnt pick up 30 hp.
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Old 08-25-2009, 05:04 PM   #26
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And for people with children with asthma that have had to be rushed to the hospital more than once...
bad breeding brings out bad traits. i suggest you be more picky when you decide to bring children into this world.

Jeez, cant make a joke around without someone getting all literal.
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Old 08-25-2009, 05:06 PM   #27
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So how does the 4.0 throttle body fit on the 2.5? also what exactly do you use the drimmel on?
this weekend ill take a few pics and post them, plus a cool trick to hog out intake while still on engine without getting metal into engine.
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Old 08-25-2009, 05:25 PM   #28
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clearly that calculation is wrong since i can go much faster than 85mph and i know i didnt pick up 30 hp.

no the calculation is correct for a mass of those weights. Other factors will come into play which may alter the findings. Temp, drag, tire size to name a few. I would imagine you picked up 5-10hp at the most.
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Old 08-25-2009, 05:36 PM   #29
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I want to say the last year it had close to 150hp but I can't say for sure...
naw, just checked out of bordum. tbi 2.5 112 hp. multiport 118 hp, last one i checked was 1999 tj 2.5 120 hp. i doubt they went that far from there but i didn't check 2004 or 2005 and so on.
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Old 08-25-2009, 06:00 PM   #30
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Man there is no way I want to
go 85 for very long in my YJ
way would you want to

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