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I have a theory about how to setup these boost maps on the DTA that we are going to try on my friends beetle when he has it running again.
You really need a dyno to set it up, and a ignition cut set on the ECU at the highest boost you will ever want to run.
The tuning of the PID will only work if the target map is set to a real value that can actually be reached.
So the target map needs to be defined well. The way to do this is to disconnect completely the wastegate (which is why you need the boost ignition cut) and do a full load run logging the boost pressure against engine speed until you get to the max boost level.
From this log, you can then work out the actual maximum boost that the system can attain and this curve (or perhaps a little lower boost per engine speed) must be used on the DTA.
By doing this the actual PID will be able to work correctly as it is trying to control to a boost level that is actually attainable.
If you request a boost level that is not able to be obtained, the I term will wind up, causing massive instabilities in boost pressure when the engine speed reaches a level where the engine can meet the required boost.
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