Haltech E6GMX - Manual (Page 48)

E6GMX Manual
48
4.5.7 Turbo Waste-gate Maps
The ECU has access to two turbo waste-gate maps that are used to control boost pressure.
The two maps are labelled “1” and “2” which operate identically but whose usage differs. For
information on map usage refer to 11.1 Turbo Waste Gate Control (TWG), p78.
The waste-gate maps are accessed through the menu structure under the maps menu.
When turbo waste-gate control is used, the ECU uses the waste-gate maps to determine the
duty cycle with which to drive a solenoid that is used to bleed pressure from the waste-gate
diaphragm to control the boost pressure. Each map has 32 bars distributed across engine
speed in the range 0rpm to 16000rpm and each bar represents a duty cycle fed to the bleed
valve in the range 5% to 95%.
4.5.8 Torque Converter Control Map
The torque converter control map is accessed through the menu structure under the maps
menu and is used in conjunction with the torque converter control. Refer to 11.4 Torque
Converter Clutch Lockup (TCC), p79
When the torque converter clutch control is used, the ECU uses the torque converter control
map to determine whether the clutch lock-up should be engaged. The map has 24 bars
distributed across throttle position in the range 0% to 70% and each bar represents the road
speed at which the clutch lock-up should be engaged in the range 0km/h to 300km/h.
4.6 Dual Maps
A second set of Fuel and ignition maps is provided for use with dual fuel vehicles or for users
who wish to use pump fuel day to day and race fuels at the track. The same engine running
on different fuels will almost always require some modification to the fuel and ignition maps
to produce maximum power (or efficiency), and rather than loading and reloading different
maps, the user can simply switch between the two maps which best suit their driving
requirements.
Dual maps can be used in conjunction with the variable valve controlled engines. Variable
valve control changes the engines operation when engaged, consequently a second map can
be tuned to suit this change so that the engine will operate correctly at all points on the load
and speed ranges with the variable valve control engaged or disengaged. The Haltech VTEC
control feature can be programmed to have hysteresis on the output to prevent oscillations at
the switching point (load or speed), consequently there is a range of speed and or load points
at which the engine operates with both the variable valve control engaged and disengaged,
this means that the fuel and ignition can only be optimised for one state of the variable valve
control engagement if only one map is used, this may result in the other state having poor fuel
and ignition tuning. Switching between the primary and secondary fuel and ignition maps
allows both states of variable valve control to be mapped correctly. The turbo waste-gate
control solenoid maps can also be configured such that waste-gate Map 1 is used with the
primary fuel and ignition maps and waste gate Map 2 is used with the secondary fuel and
ignition maps. This allows different boost levels for different fuels and environments. Refer
to 11.1 Turbo Waste Gate Control (TWG), p78.