ovan, when done with calibrating the Boost offset table.
Now we have calibrated the Boost range and the Boost offset table so that the boost control
valve gives us the boost pressure we want.
Next step is to set up the M5 / Boost modifier table.
This table can be set to all zeros. But then the boost control will always try to achieve the set
boost pressure. Even if the throttle is only half open. This will make the pressure rise before the
throttle, and in turn that the exhaust back pressure before the turbo will rise. The effect of that is
that the on/off throttle response may be a bit jerky. It also implies that the fuel consumption will
go up slightly, due to the extra work for the pistons to push the exhausts out of the cylinders.
It is beneficial to set up the Boost modifier table similar to the example in Fel!Hittar inte
referenskälla. below.
Boost modifier table
Looking at the example Boost modifier table in Fel!Hittar inte referenskälla., we can see that
if the throttle is only 80% open, the Boost setpoint will be lowered by 8 KPA, and if the throttle
is 40% open or less, the Boost setpoint will be lowered by 50 KPA.
The Boost modifier table can also be used for protection of the engine when the intake air
temperature rise to a dangerous level.
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