Quote:
Originally Posted by PlanoEvo
What fuel are you running? Will 93 support 11.5:1 ?
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I have sucky gas in Iowa, the best I can get is BP 91 octane with no ethanol. It runs about 22* of timing and 12.3:1 AFR at peak torque and around 25* of timing and 12.6:1 AFR at peak HP up top.
I'm sure my 11.5:1 compression is quite a bit lower than most cars here running 8.5:1 plus lots of boost, probably making an effective 20:1 compression ratio (or at least high teens). The previous owner just about converted it to e85, but with the annoyance of the cold start in the CTS-V I just can't do it in this car, especially with how much it makes on the 91 gas.