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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
8/1 compression with 1 bar (14.7lbs) is close to the same effective compression ratio as 10/1 running about 7.4 lbs of boost. Both are on the agressive side for a 930.

Doing this requires close management / listening for knock and motor temps. They are quick to pull back spark, add fuel and or pull back boost. Often boost is managed by rpm. I belive higher boost can be run early in the rpm range and has to be reduced near TQ peak.

Most OEM turbos also run AFR's on boost in the 10's.

And all the other stuff mentioned.
Old 02-02-2010, 05:23 PM
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