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Before I spun a rod bearing, I was running an Edelbrock supercharger (original pulley 11psi) on California 91. Delicious tuning was always battling my IAM's dropping down anywhere from .9-.75. IAM's were the worst when autocrossing in hot weather.
After my rebuild, I am now running 10:1 pistons with a smaller pulley (18psi). IAM's are rock solid on 1. Power is significantly higher despite the closely comparable effective compression ratios. I never have to worry about Cal 91 gas anymore. However, Delicious has stated I won't be able to take advantage of e85. In any case, I am content with the power for now.
Would I personally choose 10:1 pistons again? No. I would choose maybe 11.5:1 to give me a buffer on shitty california gas, while still being able to take advantage of e85. This is only my take on my roots supercharged setup. Every boosted setup is different.
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