Haltech F10X - Manual (Page 61)

F10X Manual
61
CHAPTER 9 CORRECTION FACTORS
Note: The following correction factors should not be altered unless you have a
detailed knowledge of your engine and the environment in which it operates.
Severe damage can be done to your engine if the correction factors are not set
properly.
The ECU has further correction maps: inlet air temperature and battery voltage fuel
correction.
WARNING:
MOST USERS SHOULD NEVER ADJUST THESE MAPS. THESE
MAPS ARE FACTORY SET TO PROVIDE EXCELLENT
CORRECTION FOR ALMOST ALL ENGINES. THESE MAPS
SHOULD NOT BE ADJUSTED UNLESS THE USER HAS
EXPERIMENTALLY DERIVED DATA THAT THE CORRECTION
FACTORS COULD BE BETTER CUSTOMISED TO SUIT A
PARTICULAR ENGINE.
9.1 Fuel Versus Air Temp Map
The mass of air entering the inlet manifold varies with the temperature of the air. To
compensate for this the ECU uses the fuel air correction map. The values supplied in your
ECU have been mathematically determined to give the optimal correction for most engines.
The map allows the user to set positive and negative corrections.
9.2 The Battery Voltage Map
The ECU uses fuel injection driver circuitry that compensates for changes in battery voltage.
This compensation can be insufficient for the full range of battery voltages that a vehicle's
electrical system may experience. As the battery voltage falls, the injectors will take longer to
turn on and so reduce the effective open time. To compensate, the F10X applies the Battery
Voltage Map to increase the injector on-time as the voltage drops. This map should not be
altered unless the system is connected to a fuel injector test bench that will allow the injectors
to be accurately flow tested over a range of battery voltages and the corrections calculated
accordingly.