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Linus Gump -> RE: Turbo or Super (7/31/2007 9:53:57 AM)
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Both a turbo and a supercharger will shorten engine life because they both pressurize the cylinders more than natrual aspiration. A supercharger works all of the time because it is connected directly to the crankshaft, where as a turbo is driven by the exahust and only creates boost when needed. A turbo can be fitted with a waste gate to regultae total boost pressure, where as I don't believe a supercharger can be. Because the turbo is powered by the exahust, there is a lag between the time you put your foot into it and it builds boost. This lag is noticeable, but predictable. A supercharger has no lag since an increase in crankshaft rpm directly affect the supercharger speed and boost. A turbo will create higher exahust temps because of the restriction of the turbine in the exahust sytem close to the heads. This extra heat must be dealt with, or critical engine components may melt, or cause a fire. Typically proper placement in the engine bay, heat shields, and a moderate boost level is all that is needed.
I would suspect a turbo could provide better fuel economy than a supercharger because you can drive a turbo with little to no boost and basically have exactly what you have now with the same fuel consumption, whereas with the supercharger you have boost all the time and therefore extra fuel, to maintain the air/fuel ratio, all the time.
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