Quote:
Originally Posted by Don Whitmore
Everyone....thanks much for the input, really, really appreciated.
@Aaron Keown....the car is an '88 Firebird with a 350 ci 265 hp fuel injected combo, in SS/JA. The car has run 1.25 sec 60 foot times which I thought was pretty good, but your comments on Jeff Dona's car (1.18 sec) blew me away. IMO, that's an awesome 60 foot time for that kind of Super Stock car.
From what's been said, beginning to think one of the reasons is the AFR is wrong at the starting line. Thinking it through at the starting line, the car is staged and on the rev limiter. The throttle body is wide open, but the engine is only consuming the air required by the limited rpm. The trans brake is released, the engine rpm accelerates quickly and the converter flashes. At converter flash, the engine encounters the load imposed by the car and struggles to accelerate further.
At that point, I would think cylinder pressure would be high, so is a lean or rich mixture better at the given rpm (6100 rpm).
Not sure the converter is right either, it was used for a different (but similar) combo...and may need tweaking...per ss3011's point.
Just thinking 'out loud' ...
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I would think you might look into accelleration enrichment function. And program it off rpms and map sensor.
What I know about ECU's might fill a thimble. But I got mine to leave pretty good that way. I also leave at least 500 rpm (2 step setting) before converter lockup.