Big_G
Active Member
Open to opinions on the relationship of timing and a/f ratio at full power levels (max boost), in an effort to prevent detonation and generate the most power. Case in point...my combo. 8.3 scr and approx. 18 lbs boost and 30* timing at 6,000 rpm. No signs of detonation...using a fairly cold plug. Visible smoke (expected) at full throttle. I believe I have the v/e and desired a/f tables set to 11.0:1 in the high boost cells. Now the best power seems to be made at about 12.5-13.0:1 a/f ratio, so I am leaving a good percentage (5-6%?) on the table. It seems to me if I lean out the full throttle mixture a point and a half to get to 12.5, my risk of detonation will increase. How do I figure the appropriate timing with the new a/f ratio to maintain a safety margin? Keep in mind I can't here the detonation...engine too loud. I can, of course, read the porcelain on the plugs..Thanks, gents..