A/F for NA or FI

Originally Posted by warmonger 11/15/05 08:05 PM

I have to reiterate the point that our engines run leaner than engines of the old days. The combustion temps are higher yet they still resist detonation and pinging better.
I have always run much higher EGT temps. I always made my best power when my car was NA with 13.2:1 A/F at WOT without any worries of pinging.
With the turbo this engine is comfortable with 12.5:1 A/F without detonation...on 91 ocatne no less!
These engines have better materials than the engines of old and people don't realize it; especially the 'old time' hot rodders. THey'll tell you the engine will blow up on a NA engine with a 13.5:1 A/F ratio. That isn't the case at all and it has been proven bymore than just myself.
With the turbo, old school turbo people say to run 11.5:1 or even 11:1. THat is pig rich for this engine. AF with my turbo as I said earlier is comfortable at 12:1 and fine on 12.5:1 with moderate boost. I have no fear running my engine at 12:1 and 12-14 pounds of boost! That is because this engine is well designed and it is very efficient.