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Boost Req. drops suddenly during WOT

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Hey,

sometimes i get a strange drop in power during WOT pulls in lower gears. (it's not DTC!) I can feel it and it's also clearly visible in the logs, that Boost Setpoint Factor, Boost Req. (and accordingly Boost Mean) go down in the range at about 4000 - 4500 rpm and back up again afterwards. I've marked the region in the datazap log, where Boost Req. drops nearly 200mbar (or 3 psi).

http://datazap.me/u/rayban81/boost-r...7-8&mark=19-26

Any ideas, what causes this behaviour?

Best,
Clemens

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