spytech

I am building a GTM Supercar that uses a 408 LS2 (utilizing an LS1 engine harness and computer) and the car starts and idles with my 78mm C5 throttle body on it. If I put on anything else (ie: a nick williams 96mm) the car will not run.

I sent out my HP Tuners file to Nick Williams and he tuned it and sent it back. The car idled for 3 seconds and then died. Now it will not even idle at all when I try starting it. The car throws zero codes. (this is what it did before I had Nick do a tune).

While I wait to see what NW has to say, I thought I would post here - any ideas?

twitchtwice

iTrader: (12)

will it run with a little bit of throttle when you put the nick williams tb on there?

spytech

Yes it will rev and what not, but as soon as I let off it dies instantly.

Sales4@Texas-Speed

iTrader: (4)

Do you know what reluctor wheel is in the motor? Some of the later LS2 motors came with a 58 tooth reluctor wheel that would not operate with the LS1 computer.

spytech

Thanks for the response. Pretty positive it is the 24x. I was driving the car around in go-kart form when I had the stock c5 78mm tb mounted.