Quote:
Originally Posted by Future M1 owner
There's no sound reason for twin twin scroll turbos on a six cylinder, be it a boxer, V or inline, Porsche, BMW or other.
Dual twin scroll turbos means four separated exhaust streams, which is not a workable engineering solution for a six.
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That's not entirely correct. You can have an uneven split of cylinders - two cylinder to one and one cylinder to the other. The idea is to pair the two cylinders which exhaust gas won't affect each other to be on the same scroll. The other option is to have a sequential scroll which have a smaller scroll and a larger scroll to connect to the 3 cylinders, with a valve controlling the opening of the larger scroll, but which I don't think this will be the route BMW is going for this engine.