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AC Load Compensation In Modeled Fueling


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VE is definitely way different with alpha-n at idle rpm and AC on vs off, and short of a full 4D fuel table I don't see a supported method of working around it.

G4+ ECU Tuning Functions > Fuel > Fuel Corrections > Idle Load Trims > Air Con Trim

amount of time in milliseconds added to the injector pulse width when the Air Conditioning clutch is engaged.

This is the right trim to use, but it's locked to injector millis and thereby traditional fueling.  In modeled alpha-n:

  1. AC turns on increasing demand.
  2. Engine goes lean with stall compensation via IAC solenoid.
  3. Engine dies.

By adding 32.5% to my idle cells in a 4D fuel map I've worked around this, accomplishing stable lambda across AC state transitions; but this should be a supported use case.

Additional context:  http://forums.linkecu.com/index.php?/topic/7096-idle-with-accessories/

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