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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Using the Co chart, setting idle CO at 3.5% gets us a 13.2 AFR and should achieve the best pre-boost performance. Stock Co gets us around a 14/1 AFR which is better for idle and cruse AFR.

Unfortunately the 3.3 930's do not have acceleration enrichment,just boost enrichment, so it comes to a decision between performance or efficient cruse MPG. The 3.0 Turbos did have acceleration enrichment with loss of manifold vacuum.

Getting a more ideal pre boost AFR and ignition advance can noticeably improve off idle performance.

Last edited by 911st; 04-20-2010 at 05:21 PM..
Old 04-20-2010, 05:17 PM
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