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      11-27-2012, 11:57 PM   #160
Ænema
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Drives: BMW
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Quote:
Originally Posted by J Boy View Post
Not sure exactly what you mean by "the better the car will perform." but from what I understand, a lower CR will give turbo cars better peaks and take away from their low end.
In a perfect world(no limit on octane) the higher the compression ratio the more power the engine will make. Period.

However, with pump gas you run into an issue of the high compression ratio making the engine very likely to pre-ignite and detonate. So you take some CR out to make the engine less likely to knock.
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