@xcelir8bmw quick question...
What brand and octane rating do you run in your X2, and have you changed it lately?
Reason I ask is the TDI seems to want RON 97, which is roughly US AKI 93. If the engine isn't adapted to this, it will pull timing and alter the fuel map to avoid detonation. This can really mess up the tuned behavior.
I'm surprised disabling the pedal mapper made such a big difference. The TDI box and pedal mapper really don't interact at all, electronically or operationally. But I guess a rapid, unexpected throttle surge can cause strange things as maps shift from low-load to high-load quickly.
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