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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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Hi, I haven’t posted here for a while but I marked up the chart shown above.

First, the origin of this chart was a Porsche technical turbocharging paper published close to 30 years ago. It’s relevance is to Porsche air-cooled boxer engines of 3.0 to 3.3l, which still applies to most all posters on this site.

This should not be extended to modern water-cooled , small bore, four-valved, center/multi spark engines with ultra precise fuel delivery backed-up by knock sensor spark control.

Within any given engine configuration which is fully optimized N.A. or supercharged ultimate power is controlled by available fuel octane and how close one chooses to run near detonation and component mechanical limits.

Last edited by copbait73; 04-08-2009 at 11:14 AM..
Old 04-08-2009, 10:35 AM
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