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      08-15-2013, 12:42 PM   #36
mkoesel
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Drives: No BMW for now
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Quote:
Originally Posted by RichReg View Post
Correct me if I'm wrong but, some superchargers are powered by electric motors, correct?
Not in any production automobile that I am aware of, no.

Quote:
Which greatly reduces lag.
There is no lag. A supercharger is not powered by exhaust gas, so it does not have lag as demonstrated by a turbocharger.

Quote:
So is this design basically eliminating the turbo lag by 'supercharging' the twin turbos?
In a manner of speaking, yes.

The reason to use a turbocharger vs. a supercharger is that it does not rob power from the engine in order to spin its turbine. The reason not to simply fix this by using a purely electric supercharger is that the energy storage required to power it would be very heavy. So, you combine the ideas by using an electrically assisted turbocharger (or system of them in some combination).
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