what does a turbo do and what does a supercharger do?

Basically the same thing, they both force more air into the combustion chamber. However, a supercharger is driven by a belt connected to the crank shaft and a turbo is driven by exhaust gases flowing out of the exhaust manifold. <br><br>A turbo has an impeller which is turned by the exhaust gases and connects to the turbine by a shaft. The turbine compresses the incoming air. The time when the exhaust gas flow slows and doesn't spin the impeller as fast as the incoming air is flowing is called turbo lag.<br><br>A supercharger is turned by the crankshaft via a belt and pully so there is no turbo lag to worry about.<br><br>On average a turbo will add more horsepower than a supercharger (people will argue that however)