Anybody know?

[YJwonderboy]

Anybody know the Stock Horsepower of a '91 Wrangler YJ, with the 2.5L 4cyl? I wanna say it's around 120 but I could be wrong.

[freewaydan]

I think its more like 90

[murphdog]

Hey YJ, did you ever find out the H.P. rating on your 91'? I just bought a 95 with the 4cyl. and I was wondering what it was rated at. Also, are there any easy bolt ons to add an extra 10-20 H.P.?

[YJwonderboy]

Easy bolt on's...Try a K&N air filter. It might not add 10-20 HP, but they supposedly guarantee a noticeable horsepower gain. You may also wanna look at a throttle body spacer. They help a little, keeps the airflow consistent instead of bouncing around inside your intake manifold.

[blackZZR]

best bolt on for the 2.5 would be a 4.0
but serriously, I would think a throttle body spacer would work wonders and be smog legal

[killwhytey07]

the factory rating for a 2.5 is 120 h.p., the stock 4.0 makes around 180-190 h.p.

[TommyGp]

I speak from experience, the throttle body spacer does nothing for the 2.5 MPFI engine.

TB spacers work decent for throttle body injected engines because they allow for a longer air/fuel mixing zone. Since the 91+ 2.5L is multi-port injected the spacer doesn't do much.

The most you can reliably do for a 2.5 is bolt on a 4.0 throttle body (larger diameter), high flow intake, and high flow exhaust. I've read somewhere that Ford 5.0 injectors work well to provide more fuel to go with the increased airflow.

[YJwonderboy]

The factory rating for a Stock 2.5 AFTER '95 was 110-120, cause after '95 chrysler started putting the Neon 4cyl in the 2.5 Jeeps...before that, I did some research and I think it's anywhere from 90-110...still not a whole lot.

[Matt2001TJ]

Never Again

best bolt on for the 2.5 would be a 4.0

I had a 2.5 in a cherokee, it was ok with a 4 speed and 31s but to put 33s or 35s .. nope. But every person i have met that tried to squeeze every last drop of blood/power out of a 2.5
was never happy in the end. For what it cost to do all the mods. just put a wrecking yard 4.0 in it and get it over with.
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(ollllllllo)
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[paultyler]

I had a 2.5 in a cherokee, it was ok with a 4 speed and 31s but to put 33s or 35s .. nope. But every person i have met that tried to squeeze every last drop of blood/power out of a 2.5
was never happy in the end. For what it cost to do all the mods. just put a wrecking yard 4.0 in it and get it over with.
______
[_____]
(ollllllllo)
[]---o-[]

That's right. Save your money. I've tried it all...4.0 TB, TB spacer, bored out intake manifold, K&N, and snorkel. The only thing I ever did that I believe did help was (1) a good tune up and (2) a high flow exhaust. The problem with the exhaust (magnaflow) was that it was so loud I had to take it off after one week.