I have around a 9.0:1 compression ratio with my 1.9mm head spacer and I run 92 octane from BP all the time. Currently I run 10-11psi normally on pump gas and have AFR's of 11.8:1 while at WOT. Today I ran 12.5psi really quick racing my buddies dad in his 04 cobra mustang running a AFR of 11.7 to 11.9:1 on 92 pump gas. I ultimately want to run 15psi this thursday on the dyno but I'm not sure when the detonation will begin to occur.
I am NOT making any timing adjustments to this motor under any circumstances unfortunately. The only adjustments will be made by the computer itself with the aid of its two knock sensors and other stuff.
I beat the cobra stang btw.
