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Unread 05-18-2008, 01:10 PM   #1
apollokilo
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Join Date: May 2008
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Cheap Preformance Mods

Hey people,

This is my first post here and I'm sure its a repeat, but I couldn't find the thread. I have a '95 ZJ with the 4.0 straight 6 engine. I'm looking to do some performance mods but I'm not sure what to do. It's my daily driver so I can't have it down for anything longer than a weekend. I also have a college students budget so $400 a pop is about all I can spend. I was looking at mufflers and intake systems. Does anyone know if replacing either of these will give me better performance? Thanks for any suggestions.

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Unread 05-18-2008, 01:18 PM   #2
tsconver
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2003 WJ 
 
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Quote:
Originally Posted by apollokilo View Post
Hey people,

This is my first post here and I'm sure its a repeat, but I couldn't find the thread. I have a '95 ZJ with the 4.0 straight 6 engine. I'm looking to do some performance mods but I'm not sure what to do. It's my daily driver so I can't have it down for anything longer than a weekend. I also have a college students budget so $400 a pop is about all I can spend. I was looking at mufflers and intake systems. Does anyone know if replacing either of these will give me better performance? Thanks for any suggestions.
a 99 or later intake manifold will livin it up some. A bored throttle body (63mm) will help it as well.
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Unread 05-18-2008, 01:51 PM   #3
QuadraTokn
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Unread 05-18-2008, 02:04 PM   #4
Jeeples
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Originally Posted by QuadraTokn View Post

YOU WILL NOT see more performance with $400. It takes thousands to see a big difference!

although you could start with a CAI, kolak's exhaust, and a bored TB.


but since that would be over $700 right there, plus the installation of the exhaust: buy a used CAI, and piece together your own exhaust using a high flow cat FM muffler and a turndown after the muffler.


might as well sell it and get a V8. It gets the same mileage.

Not neccessarily true, as stated in an earlier post, the 1999 and newer 4.0 intake manifold is a great bang for the buck mod. There was a link to a thread posted here that had dyno sheets showing solid gains in HP. Considering that you can pick up the manifold for less than $100 at the boneyard, it is much more cost effective to start with that, then add a good free flowing exhaust and header to compliment the intake manifold.

Being that the OP's vehicle is a '95, he can also upgrade the factory ignition system with a high output coil, cap, rotor, and wires, of course he could go all out and get a performance distributor as well. With a healthier ignition setup, adding the '99 and up fuel injectors would be a good idea to, since they have a better spray pattern for improved atomization of the air/fuel mixture, this would allow him to create the most energy possible without having to add more fuel to the combustion chamber.

If the OP is creative enough, he could probably pickup the '99+ manifold, injectors, wires, cap, rotor, plugs and coil for under $400, add in a decent exhaust system (such as Kolak's) and he would be right around $700, assuming he doesn't have to pay for someone to install these items, that would net him noticeable increase in power for under $1k.
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Unread 05-18-2008, 02:38 PM   #5
QuadraTokn
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the '99+ intake along with the ignition system and everything should only get you ~10HP. Also said in that thread. I would rather change the cam for all that work.
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Unread 05-18-2008, 05:23 PM   #6
texas_jeep_guy
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get the intake kit from rustys for 125. then you can cut the exhaust right after the cat and gain alil from that plus it sounds amazing. rustys also has a programmer for 380. im waitin for my intake kit to come in but a friend has one and it helped alot and the no exhaust i got that too and it helped a little but its free and cant hurt.
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