Quote: There is no way to spin anything without expending energy. The energy in this case comes from the fuel.
Turbochargers are recovering some of lost heat energy in the exhaust stream, unlike a supercharger which is stealing it off the front of the crank.
One reason why turbos will always make more power than a supercharger.
Top fuel teams were working on turbocharging at one time because the supercharger load was calculated to be as high as 500hp off the front of the crank!
