Haltech E6M - Manual (Page 63)

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CHAPTER 8 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 Haltech E6H/E6M has two further correction maps to compensate the fuel for changes in
inlet air temperature and battery voltage, and also two correction Maps to adjust ignition
timing for coolant and inlet air temperatures.
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.
When the E6H/E6M software is run in the OFFLINE mode, the software will load factory-set
correction maps unless other maps are loaded.
8.1 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 E6H/E6M 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 Fuel Air Correction Map is accessed via the Fuel Maps and Set-up Menu. Across the
bottom of the map displayed is the inlet air temperature. An arrow appears showing which bar
the system is currently using.
The map displayed is split by a horizontal line. Bars above this line indicate a positive
correction making the mixture richer. Bars below the line indicate a negative correction
making the mixture leaner.
A typical Fuel Versus Air Temp Map was loaded into your E6H/E6M at the factory. You
should not modify it unless you experience trouble with variation in engine performance with
air temperature.
8.2 The Battery Voltage Map
The Haltech E6H/E6M uses intelligent 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