Quote:
Originally Posted by Fundahl
There have been twin-charged cars, mainly race vehicles. The benefit is the ability to run a large turbo with a high flow rate but without the lag.
You can do it properly with a positive displacement blower that has a clutch to disengage the pulley when the appropriate turbo rpm is reached.
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True. But it's non-trivial (understatement) to do well.
As you say, it's generally used to reduce lag, such as:
http://www.greencarcongress.com/2005..._vws_new_.html
But the 1M already has small turbos and not much lag, so it's be a lot of complexity and weight for little gain (which is probably why BMW didn't do it).
Now if you swapped the turbos for larger ones then it might be worthwhile to reduce the lag, but the OP suggested leaving the turbos stock...
Could it be done? Probably yes. Should it be done? Probably no...