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Old 09-13-2012, 04:26 PM   #25
68Cadillac
Scooby Specialist
 
Member#: 95901
Join Date: Sep 2005
Chapter/Region: SWIC
Location: Las Vegas, USA
Vehicle:
2004 WRX Wagon
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Here's one from ImportTuner Magazine.

Selected Quote:
Quote:
Tuning the fuel boils down to setting some targets for your AFRs and doing your best to hit those targets. For naturally-aspirated cars, AFR's should usually range from 14.7:1 at idle and very light throttle, 14:1 to 13:1 at part throttle, and around 12.5:1 at wide-open throttle.

The AFR targets for a forced-induction car are a little different. Normally, the off-boost targets will be the same as naturally aspirated engines, but under boost they usually are tuned to run rich, which leaves extra fuel in the chamber for cooling and reduces the chances of detonation. On crappy pump gas (91 octane), most tuners we know tune using conservative AFR targets under boost (around 11:1 to 12:1).
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