Originally Posted by
swingtan
Hi Ringram,
I was talking to someone about this sort of thing last week.
Have a look at B8062 and "REDUCE" the % value for the cranking. I haven't put a lot of thought into why this works, but it seems to help a lot with larger cams. I think the guy I was talking to tried values around 75% to start with, and then jumped to 50%.
The other table would be B5119. For some reason, GM decided to put some weired steps in the spark map for cranking. I removed the -VE values, added some timing as the RPM rose and smoothed the lot out.
Hopefully this helps a bit.
Simon