Given the N55 uses completely different injectors to the N54 I doubt that they are involved in this:
Quote:
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Originally Posted by N55 Engine description document:
The high pressure fuel injection valve Bosch HDEV5.2 is a solenoid type injector. In contrast
to the piezo-electric injectors used on the current BMW engines, the solenoid valve
fuel injectors are designed as inward-opening multi-hole valves with highly variable jet
angle and form. They operate at a system pressure of up to 200 bar.
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Also given that the turbo set up is completely different I'd guess that the waste gate chatter is not reason for the changes either.
I know my comments don't really shed any more light but hopefully they eliminate a couple of options.