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Doug Siegel
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
Originally Posted by voitureltd View Post
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 and displacement change these parameters.

Since most of our US CIS 930's are modified to breathe better than stock, are we to assume that 29 BTDC at 4000 rpms (with advance and retard lines pulled off dist and plugged) is safely maximizing performance .....1 bar boost? Currently I run 26 BTDC but I am a newbie and my car still ain't tuned properly.
Old 04-15-2008, 05:06 PM
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