Tuning Fuel
- 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
- High Egt’s
- Dangers of an Overly Lean Mixture
- detonation
- destruction of internal components
- CATASTROPHIC FAILURE
- 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
- Choosing Injectors
- Adjusting for Injector Size Change
- Injector Latency
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