Problems with Tune of GT500 with Kenne Bell
I recently purchased a GT500 2007 with a stage three Kenne Bell supercharger and magna flow dual exhaust. Everything else (I think), is stock. I love the car, but here are the problems:
1. When I put the car in neutral and coast, the RPMS's fluctuate between 0 and 1000. Sometimes the car will turn off. If the heater is running, it will lose power in proportion to the car losing power. Other times, the RPMS's, while coasting, will shoot up to 1500-2000--only in neutral. When I come to a complete stop, the car will settle back to 900 RPM or so. I've had the car checked for vacuum leaks and they say it is OK. Kenne Bell says they have never heard of this problem. The original owner told me that he had the RPM problem--when it shot higher (he doesn't remember having the 0-1000 RPM problem, however), and he had to clean off the Throttle Body because condensation had built up. Eventually he replaced the TB motor. Something tells me, this isn't the problem. Kenne Bell is saying they can give me a new tune after I fill out a questionairre or something like that. I am working with a local performance shop guy who seems good but he said he has never worked on a car with this combination.
2. First and second gears are basically useless with the Kenne Bell Charger. I am thinking a set of drag/street tires on the back would help. Any recommendations? I was also told that when I do the back tires, I should also do the suspension and an upgraded drive shaft. Any thoughts?
Thanks--this is fun.