I have a built gsr turbo tuned on C16. Car was making just over 500whp on stock ignition components. Dyno tuned great, no issues, made 5-10 passes no issues. 11th pass in the water box at part throttle car was cutting out, almost sounded like detination. I made the pass, in 4th gear car cut out completely almost like boost cut.. I changed the distributer, spark plugs, tightened the gap, new fuel... Problem is getting worse. Tune looks good on the computer/chip, had it back on the dyno, could not duplicate the problem...

Any thoughts?

 

wiring issues.

 

That's what I was thinking... I've had the same wire harness working with no problems for the last few years so I'm not sure if that's it. Maybe I'll change the engine harness and look at the ecu see f anything catch's my eye. It sux I can't made it act funny on the dyno, I hate to drive it on the street and risk getting a damn ticket or arrested lol...