Ford Mustang Forum - View Single Post - Turbo or Supercharger
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post #5 of (permalink) Old 07-02-2006
Kmagn13
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Quote:
Originally Posted by GTRaptor
That is not the case, the SC will place a load on the crankshaft (drag and lateral load), the turbo will use wasted exhaust gases.

A properly tuned turbo is way more efficient and you dont need as much boost as a SC to get the same amount of power.
The biggest disadvantage of superchargers is also their defining characteristic: Because the crankshaft drives them, they must steal some of the engine's horsepower. A supercharger can consume as much as 20 percent of an engine's total power output. But because a supercharger can generate as much as 46 percent additional horsepower, most think the trade-off is worth it


Superchargers do not suffer lag... Turbochargers suffer from lag because it takes a few moments before the exhaust gases reach a velocity that is sufficient to drive the impeller/turbine. Superchargers have no lag time because they are driven directly by the crankshaft. Certain superchargers are more efficient at lower RPM, while others are more efficient at higher RPM. Roots and twin-screw superchargers, for example, provide more power at lower RPM. Centrifugal superchargers, which become more efficient as the impeller spins faster, provide more power at higher RPM.

There are tradeoffs in both systems. In theory, a turbocharger is more efficient because it is using the "wasted" energy in the exhaust stream for its power source. On the other hand, a turbocharger causes some amount of back pressure in the exhaust system and tends to provide less boost until the engine is running at higher RPMs. Superchargers are easier to install but tend to be more expensive.


Source: HowStuffWorks.com

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