Did I screw up?

[karter74]

Hey guys, I have an 87 Laredo that I just rebuilt back to stock specs except I put in the Crane Cams 753901 in it. I knew I would lose some low end power, but now the whole car just seems slower than it was before. What can I do to regain some low end torque, or atleast make the car seem faster. Granted, everything is absolutely stock, except the cam (and lifters/springs etc.) Would an exhaust system help a bunch and a cone filter?

 

[Dr. Dyno]

You've added a cam that should help the engine breathe but it's still choked off by the stock intake and exhaust systems. Upgrade these areas and your Jeep will feel like a very different animal. Here's what I suggest:

1. Rusty's intake with 6"x9" K&N, and build a FIPK-style heatshield around it.
2. Jeepersn'Creepers 60mm bored HO TB. You'll need to adapt your TPS to it and you'll need Joe Attardo's TB spacer/adapter for the Renix manifold, but it'll work wonders compared to your 51mm Renix TB.

http://www.rockmodified.com/2003/april/TB/tb_perf.htm

3. Rusty's high-flow cat & Flowmaster cat-back.
4. Mandrel-bent 2.25" downpipe custom made by a muffler shop.

 

[Wiley Coyote]

Dr Dyno is right, your engine has to breath if you want to make some horses. The bored out throttle body and new air intake will definitely help. I’d suggest a Banks header, they really help. I have one on my XJ and two buddies have them on their TJs, there is a noticeable difference in power. All of theses mods are cumulative; a cam, air intake, bored throttle body or header alone will not give you much of a return. Doing them in combination with each other will give you a lot more power.

 

[karter74]

I was wondering, instead of going throught the hassle of converting a HO throttle body to my engine, wouldn't it be more economical for me just to bore out the Renix one? Also, if I get the 2.25" downpipe, would you recommend I go with a 2.5" exhaust from the cat back?

 

[Mike@Accurate]

See this post regarding boring RENIX TB's. (From about a week ago).
http://www.naxja.org/forum/showthread.php?t=40570
MIKE