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View Full Version : performance chips for the 4L WJ



guitarpic
03-06-2007, 03:06 AM
Has anyone purchased any of the numerous chips and have they added any noticeable performance.

Mtn WJ
03-06-2007, 11:18 PM
I talked to a guy that had a download for his 4.0 WJ and he liked it a lot. I would be more tempted but the download he used required 91 plus octane and I did not want to spend the money on high octane gas. If you know of decent code for the WJ 4.0 that will run on standard grade you should try it. keep an eye on your engine temp because some of the downloads advance the timing too much as particular rpms and the engine will get hot.