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Originally Posted by ///M Power
Gains all depends on the amount of boost. Boost high enough and you will absolutely need to reinforce the internals. A supercharger does nto necessarily mean you engine will last longer at all, but rather actually puts MORE stress on your engine. Just look at how a supercharger works and what it works onversus what a turbo works on and you will understand.
Although, a supercharger will be a single unit instead of the plethora of pieces involved in a turbocharger. The mroe pieces you have the harder it may be to locate a problem. A single S/C unit is easier to maintain for that specific reason.
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Superchargers are known for there reliability. While your logic is correct, a supercharger puts no more load on your car then an ac pump. There is an external pulley that spins a step up gear inside the sc which acts as a tranfer case and spins the impeller at higher rpms and substantially faster than the external pulley.
As to komodo's question, superchargers normally boost between 6-9psi over atmospheric pressure(at sea level is about 14.7) The only tuning you will need in most cases is a boost timing retard chip that retards the engine's ignition timing under certain conditions to prevent detonation. With some kits, detonation is not a concern, in which case the kit will not include. A concern some people have when using a supercharger is that they think it will increase the engine's compression to the point that it will cause detonation that is the purpose of the chip. The only other thing you have to watch is you A/F ratio. You will prolly make around 300hp to the crank which is the best bang for your buck IMO.