Haltech IG5 - Manual (Page 55)

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If the Standard Boost Map is selected as the primary map the duty cycle applied to the
solenoid is computed differently. With the controller at its centre position, the solenoid's duty
cycle will be taken directly from the Standard Boost Map. As the controller is rotated anti-
clockwise, the duty cycle is linearly reduced to 0%. When the controller is rotated clockwise
from the centre position, the duty cycle is linearly increased to the value in the Maximum
Boost Map. The Maximum Boost Map should always contain values greater than or equal to
the corresponding values in the Standard Boost Map.
The use of two independent boost maps allows an engine to be set up for maximum boost
conditions, but driven safely at lower boost pressures without the need of re-loading maps.
The boost controller may be used by the driver to match the engine's power output to the
current demand: higher boost pressures for qualifying speeds, lower boost levels for engine
preservation or wet roads.
If time constraints do not permit the complete mapping of the TWG function, waste gate
control may be executed from just one map. Select the Maximum Boost Map as the primary
map and the Standard Boost Map is never accessed.
13.3 Dual Intake Valve Control (DIV)
Some late model engines possess two tuned intake manifolds. One intake tract remains shut
at lower rpm where there is less airflow, then opens as airflow demands increase. This
provides a broader torque curve. The DIV function controls the solenoid that operates this
valve.
In order to use the DIV function, you will need the following:
- a two wire solenoid valve mounted in the air intake (already on the engine);
- IG5 programming software and cable.
Wire the solenoid to the appropriate output, taking note of voltage polarity. (Some solenoids
are non-polar.) Run the IG5 programming software in Online mode and select the Dual Intake
Valve function on the appropriate channel. There are two values to be set.
Switch On RPM
This is the engine speed at which the solenoid is to be energised.
Switch Off RPM
This is the engine speed at which the solenoid is to be de-energised. This value should
be 200-500 rpm lower than the Switch On Rpm - a small amount of hysteresis will
prevent the solenoid from oscillating.