2002 Camaro SS a4. The car runs great, and fuel trims are nice. Has a larger camshaft (low 240's duration @ .050) a FAST intake w/ NW tb and is SD tuned.
after a quick rev if sitting still in park the rpms will come back down pretty fast and dip below the commanded idle rpm. It doesn't stall, but it is annoying. It will surge back up maybe 200 rpms over idle at times. On the log you can see that timing stays steady while this is happening at 18 degrees like set in the idle timing table. The idle stabilizes once adaptive spark kicks in....but why does it wait so long to take effect? This can go on for a second or two after before adaptive kicks in, but if the rpms are let down easy it will kick the adaptive in immediately.
I've played with the running air flow without much luck. RAF was set based on a cold start log of desired and then I've added a bit to it. I've played with the throttle follower values with no change or luck at all.... It seems the issue is the timing not correcting for the over/under speed of the rpm. I have the idle timing set to a value lower than the main table...why doesn't adaptive work immediately following a quick rev?