Haltech F10X - Manual (Page 49)

F10X Manual
49
5.3 The Haltech Maps
The Maps that the ECU uses to calculate fuel requirements are explained in detail here.
5.3.1 Fuel Map – 3-Dimensional
The fuel map is accessed through the menu structure under the maps menu or using the hot-
keys CTRL-F (2D) or CTRL-ALT-F (3D).
The Base fuel map represents the reference on which all fuel corrections are made to calculate
the final fuel requirement for the given engine load and engine speed. This map should
closely reflect the engines fuel requirements at optimum operating temperature and average
operating and environmental conditions. This map is where the most tuning is carried out.
The fuel map comprises a series of 2-dimesional maps of fuel quantity versus engine load
across the range of engine speed. If the “RPM Mode” in the main set-up page is set to 10500
there are 22 engine speed ranges in the fuel map from 0rpm in 500rpm increments, if it is set
to 16000 there are 17 engine speed ranges from 0rpm in 1000rpm increments. Each range has
32 bars distributed across load and each bar represents the quantity of fuel that is to be
injected prior to any corrections. For any given load and rpm the range for the injection time
is 0ms to 16ms.
5.3.2 Fuel Correction Map
The following is an explanation of maps that are used to correct the base fuel quantity based
on the environmental conditions.
5.3.2.1 Coolant Temperature Correction
The coolant temperature correction map is accessed through the menu structure and can be
found in the maps menu.
The coolant temperature correction map is used to adjust the fuelling based on the coolant
temperature measured by the ECU. The map has 32 bars distributed across coolant
temperature in the range of –40°C to 127°C and each bar represents a percentage correction to
the current calculated fuel.
5.3.2.2 Air Temperature Correction
The air temperature correction map is accessed through the menu structure and can be found
in the maps menu.
The air temperature correction map is used to adjust the fuelling based on the air temperature
measured by the ECU. The map has 32 bars distributed across air temperature in the range
–40°C to 127°C and each bar represents a percentage correction to the current calculated fuel.
5.3.2.3 Battery Voltage Correction
The battery voltage correction map is accessed through the menu structure and can be found
in the maps menu.
The battery voltage correction map is used to adjust the fuelling based on the battery voltage
measured by the ECU. The map has 32 bars distributed across battery voltage in the range 8V
to 16V and each bar represents an addition correction to the current calculated fuel. The
battery voltage correction is applied after all other corrections take place.