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TARGET AFR:
Allows changes to the Target Air/Fuel ratio at idle, cruise, and wide open throttle. The following are typical
values and some tuning notes.
Idle Air/Fuel Ratio – Typically between 15” and 15.0. Engines with larger cams may need a
richer setting for smoothest idle.
Cruise Air/Fuel Ratio – Typically between 15” and 15.5. Engines with larger cams may need a
richer setting for smoothest operation.
Wide Open Throttle Air/Fuel Ratio (WOT) – Typically between 12.0 and 13.0. Running richer
may reduce power. Running leaner may reduce power or cause potential engine damage.
AFR Boost Offset – Modifies the target AFR while under boost. The input is how much you would
like the Air/Fuel Ratio decreased per 7 PSI of boost. This will richen up the Air/Fuel Ratio. Good
starting point would be 0.3-0.4 AFR offset per 7 PSI of Boost. There are 4 boxes that will show up
when modifying this parameter. Each box corresponds to the target AFR at 0 PSI, 7PSI, 14PSI & 21PSI
of boost.
NOTE: The Target Air/Fuel setting between IDLE, CRUISE, and WOT is blended together automatically.
Consequently, the air/fuel you see on the MONITOR screen, may not be exactly what you set for the
settings. Changing these settings raises or lowers the “curve” of that specific area.
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