Haltech F9A User Manual download pdf (Page 89)

Once the solenoid installation is complete run the F9 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 over-boost 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 v key switched between the Maximum and Minimum

Maps.

Using the Boost Controller

The optional Haltech

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

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Haltech F9A User Manual Page 89