Most of people have after market ignition. But how to define the new dwell ? Google didn't helped me. Most of us have D585 AC Delco.

Your AFR are richer than stock !! Why ?

Ok, thanks.
Nothing is good in this car !
Make a good tune is really a big job.

I also noticed that the table "Load calculation IAT ajustment" must be modified. AFR become lean when the weather is cold.

AFR between 12.9 and 13.8 I cant have less variations

Hi, I'm french, I have a S1 drift : RB street port big intake, full exhaust air pump delete, LS2 coils only the first O2 sensor ABS box delete welded diff electrical harness simplified and many more things... I'm not a ECU specialist. When I'm logging, I have big variations of load and AFR. Is it th...