The term `` turbosupercharged '' is sometimes used to refer to an engine that uses both a crankshaft-driven supercharger and an exhaust-driven turbocharger . This is also called twincharging . This is now a source of confusion , as the term `` turbosupercharged '' is sometimes used to refer to an engine that uses both a crankshaft-driven supercharger and an exhaust-driven turbocharger , often referred to as twincharging .