Greenhorn

[blandmiller]

The VE table is actually indicating the engine's ability to completely fill the combustion chamber with air. It's nature is not to add fuel, it doesn't care about fuel. The VE tables are used to calculate the air/fuel charge.

6 degrees of advance sounds way out there, but I guess it works for you.

I am still confused as to the timing controlling AFR in closed-loop. The PCM already backs timing when it encounters knock while it is still toggling around stoich. KR has no effect on the commanded or actual AFR.

I agree that pulling timing is easier than adding fuel to reduce KR, but 16 degrees seems extreme. Are you seeing 16 degrees of KR? Allow me to quote ds8 from 10-11-06 on another forum, "My knock retard was at 8* at RPMs greater than 1400 all the way to redline with MAP at or above 85 kpa. KR was at least 5* in the same RPM range with MAP at or aove 50 kpa."

How about posting a screenshot of your 'low Rpm non-PE spark advance' table.

I am not trying to be a pain, I just want to try and understand what you are doing.