When do we use a supercharger or a turbocharger
Superchargers are used when response is more important. They do not need to spool up like a turbocharger.
Turbochargers are good for adding a large amount of power, or to add power while trading off response for efficiency. Because the turbine will absorb some of the momentum of exhaust pulses from the cylinders (which can be around ~10% of the fuel energy at full throttle depending on circumstances) it typically enjoys an efficiency advantage over a supercharger.
If you control for intercooling, if there is more boost pressure being generated than exhaust backpressure, the net thermal efficiency of the engine is higher than it would be with a supercharger, and this is often the case in a well designed turbocharged engine.
Ironically, to save fuel, a supercharger could be the better choice. Because most of the time a car engine is operated at low power, it helps to reduce engine speed (aka use a higher gear). A supercharger can provide much better throttle response and low end torque than a turbocharger and thus allow more efficient operation. This is the reasoning behind using positive displacement superchargers on newer Audis.
Turbochargers are good for adding a large amount of power, or to add power while trading off response for efficiency. Because the turbine will absorb some of the momentum of exhaust pulses from the cylinders (which can be around ~10% of the fuel energy at full throttle depending on circumstances) it typically enjoys an efficiency advantage over a supercharger.
If you control for intercooling, if there is more boost pressure being generated than exhaust backpressure, the net thermal efficiency of the engine is higher than it would be with a supercharger, and this is often the case in a well designed turbocharged engine.
Ironically, to save fuel, a supercharger could be the better choice. Because most of the time a car engine is operated at low power, it helps to reduce engine speed (aka use a higher gear). A supercharger can provide much better throttle response and low end torque than a turbocharger and thus allow more efficient operation. This is the reasoning behind using positive displacement superchargers on newer Audis.
Supercharger is more efficient and increases compression more, as compared to a turbocharger, since it uses engine power to do so. In effect, it considerably depreciates economy and efficiency of the engine.
A turbocharger uses exhaust gases to power itself and increases compression in the same way as a supercharger, though to a smaller degree. However it does not use engine power directly, and thus does not depreciate engine economy considerably.
A turbocharger uses exhaust gases to power itself and increases compression in the same way as a supercharger, though to a smaller degree. However it does not use engine power directly, and thus does not depreciate engine economy considerably.
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