Quote:
Originally Posted by Owen VEENSTRA
Thanx for sharing it Fraser.
Did you make this measurement yourself ? Doesn't seem to be an official BWM doc, so thax for making available something your probably paid for.
The curves looks quite smooth when factoring in the limited number of data points. Do you know approx when (if) the second turbo kicked in (as my understanding is the first turbo is always active but the second comes "when needed" ie your floor the accelerator).
Regards,
O.
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This is an official BMW document and represents the operation of both turbos. The intervention of the second (bigger) turbo is dependent on engine load and throttle opening and doesn't happen at a fixed rpm.