Quote:
Originally Posted by gmd2003
Stock AFR's are in the 12's at the 5k rpm range , these are at 14 that's quite lean in a high compression motor if they are accurate . Just look at the stock logs in the S 63 TU database .
George
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Also, when running on race gas it has a different stoichiometry than regular gas and can cause a leaner AFR condition being reported.
http://www.modularfords.com/threads/...s-of-Race-Gas?