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BlkBird BlkBird is offline
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Join Date: Feb 2002
Location: Atlanta, GA
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So using Fred's figures and assuming a VE of 90% and a stock compression of 8:1 -> one bar (14.7psi) would yield a 13.6:1 compression ration when on full boost.

Assuming a VE of 80% and a stock compression of 8:1 -> one bar (14.7psi) would yield a 12.2:1 compression ration when on full boost.

Assuming a VE of 70% and a stock compression of 8:1 -> one bar (14.7psi) would yield a 10.8:1 compression ration when on full boost.

I'm not sure what the VE for a 930 is but I suspect we would fall under the category of "maximum RPM modified engines may have a better VE, eg: ... 65% to 80% " which is in line with the 12:1 compression ratio I've heard used when referring to our cars.

Sound about right?

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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 11-21-2006, 05:11 PM
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