Haltech E6A - Manual (Page 83)

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Once the solenoid installation is complete run the E6A software in Online mode. Select the
Turbo Wastegate Control Function on the appropriate output channel, and set the following
parameters.
Period: This sets the period of oscillation of the solenoid. Most solenoids will operate at
around 30Hz, which corresponds to a period of about 30mS. Enter the desired oscillation
period in milliseconds here.
Boost Limit: If the manifold pressure exceeds this limit, the solenoid valve will immediately
be set with a duty cycle value of 5%. This will expose the wastegate regulator to the full
manifold pressure and force the wastegate to open. This value should be set slightly higher
than the desired boost pressure as a fail-safe in the event of an overboost condition.
Primary Map: There are two maps associated with the TWG control function. Both set the
duty cycle of the solenoid against the engine rpm. The base duty cycle value applied to the
solenoid is derived from either the Standard Boost Map, or the Maximum Boost Map.
Toggling this parameter selects the map from which will be derived the base duty cycle. The
state of this flag also affects the way the Boost Controller (if selected) operates. See Using the
Boost Controller below for more information.
Map Programming: Selecting the Maps heading will bring up the primary boost map, as
selected by the Primary Map flag. The boost maps indicate %duty cycle ON time of the
solenoid against the engine speed. A programmable bar exists every 500 rpm. Increasing the
duty cycle bleeds off more air from the manifold, resulting in a higher boost pressure. Each bar
is adjustable from 5% to 95%. Mapping against rpm permits a varying boost level with engine
speed, so the torque curve for the engine may be customised. These maps should start with all
values at 5%. Load the engine at a constant rpm and observe the resultant boost pressure at
that speed. If the boost pressure is lower than that desired, increase the height of the bar a
small amount. Pressing the
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key switched between the Maximum and Minimum Maps.
16.2.3 Using the Boost Controller
The optional Haltech
TM
Trim Module may be used as an electronic boost controller if selected
in the TWG function Options menu. The way the boost controller operates depends on the
which Boost map is selected as the primary map.
If the Maximum Boost Map is selected as the primary map, the duty cycle of the solenoid will
be determined by multiplying the base value from the map by the position of the controller.
Fully anti-clockwise, the controller reads 0%, and fully clockwise the controller reads 100%.
Thus if a value of 60 is derived from the Maximum Boost Map, and the Controller is set to
40%, the solenoid will operate with a duty cycle of 24%.
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