EFI parameters

4 parameters in the EFI family. ArduCopter 4.7 only — other vehicles share many of these names but not always the same ranges or meanings.

EFI_COEF1

EFI Calibration Coefficient 1

Used to calibrate fuel flow for MS protocol (Slope). This should be calculated from a log at constant fuel usage rate. Plot (ECYL[0].InjT*EFI.Rpm)/600.0 to get the duty_cycle. Measure actual fuel usage in cm^3/min, and set EFI_COEF1 = fuel_usage_cm3permin / duty_cycle

Range	0 to 1
User level	Advanced

EFI_COEF2

EFI Calibration Coefficient 2

Used to calibrate fuel flow for MS protocol (Offset). This can be used to correct for a non-zero offset in the fuel consumption calculation of EFI_COEF1

Range	0 to 10
User level	Advanced

EFI_FUEL_DENS

ECU Fuel Density

Used to calculate fuel consumption

Units	kg/m/m/m
Range	0 to 10000
User level	Advanced

EFI_TYPE

EFI communication type

What method of communication is used for EFI #1

Reboot required	Yes — the change takes effect after a reboot.
User level	Advanced

Values

Value	Meaning
0	None
1	Serial-MS
2	NWPMU
3	Serial-Lutan
4	Loweheiser
5	DroneCAN
6	Currawong-ECU
7	Scripting
8	Hirth
9	MAVLink