Quote:
Originally Posted by Needsdecaf
N54 twin turbo - engine cover has no wording
N55 single turbo - engine cover says "Twin Power Turbo".
Confusing? Yewbetcha.
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I think for the N55 it may be a single 'twin-scroll' turbo system and the redesigned exhaust manifold which divides into two three cylinder sections to feed the turbo. Could be mistaken though. Supposed to improve the breathing. The N57S which I have on my X6 is the 3.0D powerplant with two differently sized turbos to give 306bhp and mated to the ZF 8sp auto. My Dealer told me the 40d had a single twin-scroll system but when I popped the hood at delivery there were two blowers sitting there waiting to play
. Whether they are both twin scroll I have yet to discover.
No manual available as the engine won't pass the emission regs and is supposed to be more economical in auto too. All I know is it goes like the wind for a 2-tonne wagon with a top speed approaching 150mph - Yipe!!