Ok here's my issue. I am concidering a chip but am not sure what is better. I was looking at a JET performance stage 1 or 2 chip or the EDGE performance module. What do you guys think? What have been your experieances with them? Can anyone sugest anything better. i am also planning to add a cold air intake, throttle body, and throtle body spacer.
I wouldn't waste my $$$ on any chip like the Jet. Essentially, a chip like that primarily gains its small amount of performance by primarily advancing the engine timing which then requires you run 89 or even 91 octane gas. They also only make that small amount of difference at very high rpms and then only when the engine is also at wide open throttle. Unless you drag race your Jeep at the quarter-mile strip, they're a waste of $$$. In normal driving, you won't notice any difference.
The Edge product provides more benefit than a chip does but even it won't make a dramatic improvement. It advances the timing but it also makes the engine run richer by "fooling" the computer by thinking the engine is running cooler than it really is so it stays in the warm-up loop which can really pretty much destroy your fuel economy.
Forget installing a throttle body spacer. Spacers can help significantly when placed under a carburetor or throttle body injection system but the TJ's throttle body is not a TBI type system so a spacer won't help in the least. Only air passes through the TJ's type of throttle body so adding a spacer would be useless and provide zero benefit. Forget too their claims of "swirling" the air since even if it did, any swirling effect would be lost entirely by the time it got down the intake manifold and past the intake valves into the combustion chambers, all well below and far enough away that it has zero effect. Save your $$$. Besides, a Jeep Wrangler TJ is meant for offroading, not street racing with the local ricers.
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I put in a performance enhancing chip in Febuary just to see what I would get out of it. Ends up treating my 4cl pretty well. Idles at about 900rpms and I get a good boost when accelerating. My gas mileage has also improved, averaging about 24mi/gal
I've been running an Edge setup with the 62mm TB and the programmer for awhile now. I've had several different people rail on it in my rig and there is a marked difference both on the dyno and in the real world. We've messed with chips in the past just to see what they do and they do nothing except mess with your motor like Jerry suggests.
Honestly guys there is not a TON of stuff that can be cheaply and easily done to the 4.0 to gain a bunch of power. Your best bet is always going to be gearing.
Jerry, I'd beg to differ with you on the Edge. We've run mine on the scanner and it is not staying in Warm Up mode any longer than it does without it.
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