97jeepwrangler

I have a 97 jeep wrangler with the four cylinder in it. I want some horse power. I don't know if there is anything that would increese it a lot more then what it is now. I live on a road thats paved and has some large hills and its hard to keep it around 40 MPH. Have any ideas. Also I am pritty sure that they make terbo chargers for four cylinder engines are they good and do they work. Also any feelings on chipping it???

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Juggernaut

That sentence is like mixing water w/ oil lol. By the time you invest in a super or turbo-charger, you already had to have replaced a lot of vital engine components. The chargers themselves are $3000 and up, and who knows whether that little engine can take all that extra power. When you add a super/turbo charger, you're changing the compression ratio, putting huge stress on the engine components, the crank, cam, valves, push-rods, rockers. You'd prolly have to upgrade all of them just to keep that little engine from tearing itself apart, it's only designed to handle factory specifications, heat ranges, and tolerances.

I think most ppl on here will agree, sinking money into the 4-banger is like sinking money into the Dana35. It'll get you what you want somewhat, but you could've done it right the first time 'round.

The best you can do $ wise for more hp is: Cold air intake, 4.0 throttle body upgrade, throttle body spacer ring, top-end spark plugs and ignition wires. But other than that you're talking about some serious dough, but hey if you have the money...

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MediaRocker

Seconded. A more cost effective solution would be an Engine swap.

I know i know. i read the thread title. But seriously bro, I have a 4 banger... I've been trying... I've gone nowhere.

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1999 TJ Wrangler -2.5L I-4 AX-5, NP231, D30 Front, D35 Rear --CAI, 31x10.50 BFG A/T KO's
I'm blunt. Get over it.

Okie

gearing gearing gearin.... you don't need to swap engines.. you need gearing

33's need 4.88's or 5.13's
35's need 5.13's or 5.38's

once you do this your 4 banger will be happy and so will you

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JeepersdoitDeeper

I normally and of the school of bigger is better, but I have to go with Chris on this one. Having ridden on both the highway, and offroad wheeling in his Jeep, the four cylinder is an adequate motor when combined with the right gearing combinations. His 4 banger would nearly snap your neck if you came off the clutch too fast, and I do believe it would climb a wall at idle if allowed to.

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91YJoe

2nd this as well... Gears help the most, but I would also do the 4.0 TB swap.

I did 4.88s (5.13s would be better but thats as low as I could go in the front D30),
4.0 TB and smooth 1" spacer (port matched the TB spacer to the intake).
As long as I can get traction I can crawl up almost anything.

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sureshot40sw

deep gears (5.13 +) will require an axle swap that will require new wheels, a TJ bracket kit, new brakes all around blah, blah, blah...... by the time you get all that done, you could have swapped in a Chevy V8 with a conversion kit and had 10 times the power you need...


otherwise..... GEARS GEARS GEARS...!!!!!!!


EDIT: I forgot about the rubi axles.... find a set of those and gear em down as far as 5.38 and everything else is there... they already have the brackets and you can keep your same wheels..

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Jesse-James

I agree that gearing is your best option, 4.88 is fine with 35's. However a turbo IS a viable option that some disregard without reading up on it. You can run a turbo with 5-7lb of boost without touching the lower end. The 2.5L will hold up fine to it. There is a bit involved but it can be done without breaking the bank.

http://4bangerjp.com

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'95 YJ 2.5L Auto, SOA front, 4 linked rear on 35's

Brew City Crawlers

Okie

not in colorado

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(insert joke about texas longhorns here....)

Lucky14

Wow. Is the "2.5L I need more power" thread and the "Swap a D35 or D44" thread on a rotating schedule?

Ditto

Ditto

Ditto

But I have to ad. SEARCH

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Owner of many at one time (XJ/MJ/YJ's/TJ's) 97 2.5L KN cold air, pacesetter exh. AX5, 33's Procomp XT, 4" Custom Lift, Tera Low 4:1, Detriot True-Trac D30, SB discos, SD35 3.73 Aubrun ECTD
ASE Master Tech. L1/X1 Specialist, ASE collision Tech

sureshot40sw

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sureshot40sw

ooops... i meant ...

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JTkeefe

Oil stabilizer.

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Thread killer.

sureshot40sw

^^^ ^^^^^

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Lucky14

And if you also consider the following:

1)Prepackage Supercharger kits will set you back about the same as doing a SBC swap (decent used crate engine or CL find with reconditioning) about $3,500 with doing it right, exhaust work, EFI kit if needed, Fuel system up grades, etc. SC kits are 3,000 to 4,000

2) Kenne Bell, HESCO, Vortech all do no make 2.5L kits anymore PERIOD. Avenger DOES make the 2.5L kit but have made changes with the screw supplier. So R&D work has just finished on the new 4.0 and JK 3.8 kits. When I spoke with Avenger via Bullhide Offroad a few weeks ago... I was told that the 2.5L new screw kit should be out later this year.

Either way you have to remember build it the way you want it. As shotie said... "I'm with stupid"

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Owner of many at one time (XJ/MJ/YJ's/TJ's) 97 2.5L KN cold air, pacesetter exh. AX5, 33's Procomp XT, 4" Custom Lift, Tera Low 4:1, Detriot True-Trac D30, SB discos, SD35 3.73 Aubrun ECTD
ASE Master Tech. L1/X1 Specialist, ASE collision Tech