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Author Topic: yj with no go  (Read 3780 times)

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YJ KiD

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yj with no go
« on: September 20, 2009, 09:00:32 PM »
alright guys i have finally got my beloved yj back on its feet and running again and now am looking to improve it........ i am looking for some ideas and suggstions to help me make some more power out of the 2.5.   i have seen on the threads that guys are using forced induction to make them more power but the only thing about that is that i am ok with maintence and can fix it if it is broken but whe it comes to modification i would need very specific step by step instructions and kinda spooks me off of anything that major and was wondering if there where any mods to make any more power out of a NA 2.5

thanks for the input in advance
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Offline FourbangerYJ

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Re: yj with no go
« Reply #1 on: September 20, 2009, 09:29:03 PM »
E-fan
Ignition upgrade
19# injectors (see for sale section) :whistle:
Larger TB (see vendors section)
And re-gearing to lower gears. Need to have a shop do this unless your pretty good with setting up gears.
Lotsa good info in the FAQ.
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

YJ KiD

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Re: yj with no go
« Reply #2 on: September 20, 2009, 10:31:14 PM »
already have e-fan . . . .
 and how low of gears used for some offroad but still needs to be streetable heard that 4.56 is about right ?
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Offline sharpxmen

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Re: yj with no go
« Reply #3 on: September 20, 2009, 10:40:26 PM »
Quote from: YJ KiD on September 20, 2009, 10:31:14 PM
already have e-fan . . . .
 and how low of gears used for some offroad but still needs to be streetable heard that 4.56 is about right ?
depends on tires, although pple say here that the lower the better i would try to get it close to stock final ratio or a bit lower (i mean 1 level lower gears than what would give you stock like final ratio) - so if i'm not mistaking (has to be verified but this is just so you get the image) for example if you have 31s i think the 4.56 would be like stock then i wouldn't go lower than 4.88 (and with stock axles D30/D35 you can't anyway), but like i said some guys recommend even lower than that.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

YJ KiD

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Re: yj with no go
« Reply #4 on: September 20, 2009, 10:46:47 PM »
looked at the for sale thread do the jeep 2.5's take ford 19# injectors?  sorry if it is a dumb question but i have only owned 4.0's in the past but got a good deal on this one and how big of difference can u make with bolt ons or is this just a lost cause and i just need to learn how to deal with it? 
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YJ KiD

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Re: yj with no go
« Reply #5 on: September 20, 2009, 10:57:15 PM »
and where can i find parts to upgrade the ignition i haven't been able to find anything for the 2.5's where i have been looking any sites or links would be great
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jcsanders79

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Re: yj with no go
« Reply #6 on: September 21, 2009, 06:00:57 AM »
Quote from: YJ KiD on September 20, 2009, 10:31:14 PM
already have e-fan . . . .
 and how low of gears used for some offroad but still needs to be streetable heard that 4.56 is about right ?
I'd go 4.88 while your doing it.  Thats as low as you can get the D30/35 anyways.  What size tires do you run?
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Offline FourbangerYJ

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Re: yj with no go
« Reply #7 on: September 21, 2009, 10:13:52 AM »
Quote from: YJ KiD on September 20, 2009, 10:46:47 PM
looked at the for sale thread do the jeep 2.5's take ford 19# injectors?  sorry if it is a dumb question but i have only owned 4.0's in the past but got a good deal on this one and how big of difference can u make with bolt ons or is this just a lost cause and i just need to learn how to deal with it? 

The 91-95's can take the Ford 19# injectors.
http://4bangerjp.com/forums/index.php/topic,3479.0.html

PD makes a ignition upgrade. It looks like for the 91-02 crowd on the 2.5L
http://www.performancedistributors.com/jeep.htm

What year Jeep do you have?
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

YJ KiD

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Re: yj with no go
« Reply #8 on: September 21, 2009, 02:03:41 PM »
its a 94 5 speed . . . .running 33's now and would like to go to 35's when these are worn out which is coming pretty quick
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Offline FourbangerYJ

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Re: yj with no go
« Reply #9 on: September 21, 2009, 02:05:02 PM »
Re-gear to 4.88's.
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

YJ KiD

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Re: yj with no go
« Reply #10 on: September 21, 2009, 05:52:19 PM »
even if i decide to stay with 33's
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Offline FourbangerYJ

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Re: yj with no go
« Reply #11 on: September 21, 2009, 06:23:39 PM »
Quote from: YJ KiD on September 21, 2009, 05:52:19 PM
even if i decide to stay with 33's

YES! The small motor needs all the help it can get. Gearing makes a big improvement.
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

Offline sharpxmen

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Re: yj with no go
« Reply #12 on: September 21, 2009, 07:44:17 PM »
Quote from: YJ KiD on September 21, 2009, 05:52:19 PM
even if i decide to stay with 33's

33s and 4.88s will be like stock if you had 4.10 before
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

jcsanders79

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Re: yj with no go
« Reply #13 on: September 21, 2009, 07:54:53 PM »
Quote from: YJ KiD on September 21, 2009, 05:52:19 PM
even if i decide to stay with 33's
Definately!!!  If your going to 35's I'd go 5.38 (you'll need new axles).
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YJ KiD

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Re: yj with no go
« Reply #14 on: September 21, 2009, 08:00:29 PM »
new axles isn't going to happen.  for one i don't have enough time to wheel enough to justify and if i am going through with that big of an expense then it will go to a fuel injected small block but that prolly wont happen either add that to the when i hit the powerball list
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