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#3: 04-14-2011, 09:19 PM
 
 csbrown28
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Quote:
Originally Posted by cypher0117 View Post
the compression ratio is lower to allow the extra volume of air/fuel during full boost. The high octane is really only effective when your turbo is spooled. The added pressure from extra fuel/air brings the cylinder pressure higher than a normal combustion engine which is why you need the higher octane.
So your saying the CR is variable , but starts at 8.2:1? That would make sense.