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voitureltd voitureltd is offline
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Join Date: Feb 2008
Location: Bayside Wi
Posts: 2,329
US 930 cars 27 btdc, Euro spec 930 says 29 btc @ 4000. Early 930 Euro spec cars have a few better innards/exhaust system to make breathing better. If you go to race gas ( no catalyst ) maybe 30 BTDC. I believe both US and euro cars had 7.5 compression for this factory recommended setting. Old school engine builders/ tuners ( on the forbidden topic of somewhat modified systems ) say another 2 degrees w/ twin plug and extra enrichment using a factory distributer curve w/ race gas. Of course cams, porting, valve size,compression ratio and C I displacement alterations change these parameters.

Last edited by voitureltd; 04-15-2008 at 07:30 PM..
Old 04-15-2008, 02:36 PM
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