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Originally Posted by brisance
I don't understand why the tri-turbo rumor gets around. It would be unnecessarily complicated for an inline 6. If the electric-driven compressor is to help with low-end torque with a larger turbo taking over at mid-high revs, that sort of makes sense. But not a tri-turbo setup for a gasoline I6... compressor surge is going to ruin the party.
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The rumor started a couple of years ago and was confirmed somewhat when BMW put in for a patent that had a 3 turbo set up with 1 turbo running off of electric.