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Originally Posted by Auto_newb
30 hp per 100 HP is a quite exaggerating especially for the screw types which are the newer ones. Turbos DO rob the engine's power at some degree, just not directly, it uses exhaust gasses as a medium transferring energy from the exhaust stroke of the piston to the blades of the turbine.
They have been outlawed because turbos give so much power compared to s/cs unless you run on a course with nothing but low speed turns and sharp turns with little to none straightaways, but obviously none of this would happen, but I think it is a stupid idea to outlaw turbos as they are just denying the inevitable and the companies that make s/cs will never be ambitious to find a way around the turbo and neither will the racing teams.
BTW, I read that thread, and it hasn't changed my way of thinking... I still like s/c's  |
How much power a supercharger is robbing depends much of the boost pressure. So in a small high boosting application the supercharger takes more than on a larger low boost application.
Turbochargers DO NOT use the exhaust gasses like some sort of medium to transfer energy from the exhaust stroke, I don't know why people tend to believe this.
As we know turbines work by the same principle as the piston engine; expandning a gas mass lower its enthalpy and this energy can be converted into motion. When the exhaust valve opens the temperature is still high and the pressure is well above atmospheric, this means that the gas can be further expanded and energy otherwise lost can be extracted. The turbocharger do not take any power from the crankshaft to power its compressor. The turbine do however add a restriction like a poor flowing exhaust system which restrict the exhaust flow, and this increase the pumping losses during the exhaust stroke. However, when the turbocharger works efficiently it can produce a boost which is as high as the exhaust pressure, or even higher than the exhaust pressure which means that the engine will work as NA in a high pressure environment or even as a supercharged engine but without the powerloss.
With modern technology the turbocharger will probably handle a course with low speed turns even better than a supercharged engine unless the supercharger somehow can adjust the boost pressure with a variable speed drivesystem of some sort, this since a turbocharger easily can use a higher boost on lower engine speed and keep the turbo going even on low engine speeds with the help of antilag or perhaps a variable turbine geometry. This can give the turbocharged engine high power outputs even at low rpm, an example of this is the WRC engine which I mentioned above.