Difference between AFR and Lambda
lamda is the same for all fuels not just gasoline
Stoich Mixture for Cruise 14.7:1 AFR
Dangers of an Overly Rich Mixture
cylinder wall wash
oil contaminated with fuel, reducing lubrication properties
Dangers of an Overly Lean Mixture
destruction of internal components
What to Tune AFR at?
12:1 is a good power range (prone to det)
11:1 more reliable (10.5:1 to 11:1 for TMIC, 11:1 to 11.5:1 with FMIC)
AFR Target for Fast Turbo Spoolup
More or less power with leaner/richer mixture?
Comparing Dictated AFR to actual measured AFR with wideband
Don’t use factory o2 sensor!! Need Wideband!
Narrow band o2 reading is only .4v variance to show Lean or Rich
Factory (narrow band) o2 not precise enough to give a decent reading, let alone rely on for tune
Adjusting for Intakes
Adjusting for Injector Size Change
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Page last modified on April 20, 2007, at 08:49 AM