| Dan is right on.  Its the old "a square is always a rectangle, but a 
rectangle isn't always a square" argument.  One is just a subset of the 
other.  While an engine driven supercharger always draws on engine power 
to work, the turbocharger can greatly increase back-pressure in the 
exhaust system, so it isn't a free lunch either.
JJJ
>By definition, a turbo charger IS a supercharger, but a supercharger is not 
>necessarily a turbocharger. By definition, supercharging is the act of 
>forcing air into an engine under pressure, or, to provide the engine with a 
>super charge; therefore, a turbocharger is indeed a supercharger.
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