I think that at about 10 to 1 compression you are pushing the 93 octane pretty good. My Celica had 14 to one compression and had to use 110 octane. It would be nice if there was a chart that listed what compression you get with different boosts. There is probably a formula to figure it out. There are other sites that have monster outputs from the 7m engine, maybe some of them would have a formula for what you are looking for.
Russ
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