Haltech E6M - Manual (Page 95)

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Once the solenoid installation is complete run the E6H/E6M 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.
Use 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 Map 1 or Map 2.
Map Programming
Select the Maps menu and go to map 1 or 2 depending on the map selected for the
TWG you wish to tune. The boost maps indicate %duty cycle ON time of the solenoid
against the engine speed. A programmable bar exists every 500rpm. 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.
16.2.3 Using the Boost Controller
The optional Haltech
TM
Trim Module may be used as an electronic boost controller if the trim
control field in the input/output page is set to “boost control”.
The trim module varies the wastegate duty cycle from the appropriate map value at full
clockwise rotation to 5% duty cycle at full anti-clockwise rotation and linearly reduces the
duty cycle in relation to the trim control position.
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.