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It increases the hp/torque of the engine by increasing its (VE)volumetric efficiency. It does this by force air/fuel into the engine under great than atmospheric pressure(boost). Boost is Absolute pressure(coming out of the supercharger-atmospheric pressure(14.7psi aprox.) Absolute pressure/atmospheric = P/R Theoretically how many times more air the engine is seeing.

An example:

a 302 v8 that normally has a V.E. of 80% = only 241cuin. of the engine is filling per complete cycle. BUT with a supercharger running at 7.5PSI (boost) 1.5p/r =361cuin is consuming/ 50% more= a possible 50% increase in power. I say possible/theoretical because compressing air heats it, causing a reducing the increased amount. air to intercoolers and alcohol injection can get it close(90%) to the potential output, only air/water with ice can get at or above the estimate. So a 300hp 302 with a 7.5psi intercooled kit should get close to 450hp, probably 435hp is more likely, for a 135-150hp increase.

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Q: What does a supercharger do to your car?
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An electric supercharger is essentially an electric motor run off a car's alternator driving a high speed fan which attempts to force more air into a car's air intake. The idea is the same as a turbocharger or supercharger, the more air and fuel forced into the combustion chamber the more power that will be developed by the engine. The only difference between a turbocharger or supercharger and the electric supercharger is that the electric supercharger is limited by how much power the car's battery and alternator can supply whereas a turbocharger and supercharger is limited by the amount of power the engine can supply which is significantly greater in comparison.


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