Performance for a 90 yj - JeepForum.com

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post #1 of 22 Old 06-29-2013, 10:32 AM Thread Starter
moeller26
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1990 YJ Wrangler 
 
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Performance for a 90 yj

Does anyone have any suggestions to get more power in my YJ it's a 1990

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post #2 of 22 Old 06-29-2013, 10:38 AM
blackjeep05
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Not a whole lot you can do but, is it a four banger or a 258 six? If its a 258 six you can put a head on a 4.0L on it to pick up about 40 horsepower. You will have to make some modifications to do it but, its do able. You can also do fuel injection for either engine but, it can be pricey. What is your current set up? Auto? Manuel? Tires,lift?

Soccer six in the mix.
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post #3 of 22 Old 06-29-2013, 10:41 AM
dancytron
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Fill out your profile.

Is the issue that it isn't running right or that the stock performance isn't good enough for you?
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post #4 of 22 Old 06-29-2013, 10:53 AM Thread Starter
moeller26
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Stock isn't good enough. It's straight six 4.0 4in suspension lift with 35's
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post #5 of 22 Old 06-29-2013, 10:55 AM
crackedcornish
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speed is just a question of money....how fast do you want to go?


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post #6 of 22 Old 06-29-2013, 11:04 AM Thread Starter
moeller26
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Around 65 but I want to be able to make it up hills with power too. I can get to about 55
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post #7 of 22 Old 06-29-2013, 11:12 AM
blackjeep05
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what gears you running? 35s are big tires and to be able to run 55 up a hill is not bad.

Soccer six in the mix.
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post #8 of 22 Old 06-29-2013, 11:15 AM Thread Starter
moeller26
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I don't know the gears. And I wish I coul go 50 up a hill on a good day maybe 30
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post #9 of 22 Old 06-29-2013, 11:22 AM
blackjeep05
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well check your gears because if your not geared right everything else is mute.

Soccer six in the mix.
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post #10 of 22 Old 06-29-2013, 11:23 AM
blackjeep05
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With 35s I would say 4.88s or so but, depends alot on if you have a stick or auto.

Soccer six in the mix.
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post #11 of 22 Old 06-29-2013, 11:39 AM
wendell
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In 1990 it should be a 258 straight 6 unless a 4.0 has been swapped in. Lets say it is a carbed 258 and I'll tell you what I did with my 258 for more power. I installed a 470 holley TA 4 barrel carb, offy dual plane intake manifold, roller rockers, comp cam, higher compression pistons, ported head, header, dui distributor and MSD. My 258 will scream, it really bumped the power to well over 200 hp. The 4.0 head works best on a 258 if you go FI. I found a ported 258 head works better with a carb as far as making more power with my other mods. The 258 is capable of making great hp and gobs of low end torque with throwing a few parts at it.

1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed
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post #12 of 22 Old 06-29-2013, 11:40 AM
Tom95YJ
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4.88 gears , 4.0 Head. Fuel injection and a cam you'll be good


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post #13 of 22 Old 06-29-2013, 11:50 AM
roadyrob
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with 35"s your biggest problem is the gears but wendell gave you good advice on how to get more power from the 4.2. fix the gears first.

Do everything with a positive attitude, it won't always work but you'll piss enough people off to make it worthwhile.

the voices aren't real but they sure have good ideas.
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post #14 of 22 Old 06-29-2013, 01:04 PM Thread Starter
moeller26
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How much will this cost? I have time to work ok it but there is only so much money
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post #15 of 22 Old 06-29-2013, 01:24 PM
Tom95YJ
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Gears and carriers roughly 500-600 then the going rate for labor is 250-300 an axle


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