Hehe, yes, this is what i wanted out of this thread, good debate From what i am gathering from Armond, is that he is not using ANY timing retard up to 20 psi on pump gas??? Am I getting that right? Is this with stock 9.6:1 compression or lower compresssion? 11.0:1 is running pig rich. It does makes sense though, to run much higher boost levels to have the much needed extra fuel to help cool down the A/F charge, and lower the combustion temperature to prevent detonation. That I have no problem with, and to which i completely agree.

My point, or "theory", was instead of running such rich A/F ratios to cool the mixture and lower the temps, why not run slightly more "conservative" A/F ratios, and THEN retard timing to help cool the burn process. By retarding the time the plug fires the mixture, it helps cool down the combustion temperature be cause it makes the plug fire at a later time in the cumbustion process, later after max compression is made, therfore lower combustion temperature keeps it from detonating. Does anyone think that you are getting the maximum HP out of a 11.0:1 fuel mixture? Seems to me that there can be more power from cumbustion if the mixture contains less fuel than that, its just my idea anyway. I have another queston for Armond, as he seems to be the leader here with high HP 420A motors.. Did you use ANY form of ignition timing retard when you dyno tuned yours or any other 420A's??? I would really like some more of your input.

And as for the SAFC's, I will NEVER use one, as its cabability to add igntion timing and leaner fuel mixtures isnt what we really need with a turbosystem. For N/A applications, it can be a excellent product.

My intent of this thread was to enlighten the unknown about what our engines can and cant handle, according to spark timing. I always want to learn more, always. Knowledge is power

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)