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BlkBird BlkBird is offline
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Join Date: Feb 2002
Location: Atlanta, GA
Posts: 938
Compression ration question...

Fellow 930'ers,

No doubt documented somewhere, but what is the CR for a Turbo when it is on full boost?

For example, say your car is 8:1 CR off boost and you're running a 1 bar spring. Does that mean that at full boost you have doubled the atmospheric pressure and therefore doubled the CR to 16:1?

I'd imagine there would be some losses and you wouldn't really double the air pressure going into the motor but what's the final result going to be?

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Boost Addiction - honestly, I have it under control
1989 911 Turbo Cabriolet
Mods include: Kokeln IC, GHL Headers, Hooligan muffler, Modified K27 7200, BL WUR, LC-1 & XD-16, Bilstein Sports (4), TRG sway bars, Oversize torsion bars, Strut brace
Old 11-20-2006, 09:04 AM
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