Oil pumps can fail on turbos, and they require tapping the oil pan, but a self-contained system requires its own fluid change and watching of fluid level. Cooling is also better through the engine oil. If a system has its own reservoir and cooler, it needs its own pump, lines, radiator, and so on. Lots more failure points. More importantly, there are superchargers that tie into the engine oiling system, and there are turbos that use their own lubrication. The whole point you made has little to do with the supercharger vs turbo question other than, maybe, what is the preferred method of cooling, and what is offered in mainstream kits.
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Originally Posted by Turbowned
Generally speaking, a supercharger should be more reliable and less fuss because it is internally lubricated and does not have to tap into the engine oil supply. Also, boost tends to be more consistent and thus safer because it doesn't rely on a wastegate to meter boost pressure (again, generally speaking). In the FR-S/BRZ, the primary catalytic converter is located in the exhaust manifold, so that has to be eliminated if you install a turbo. Therefore, your likelihood of passing emissions without doing any funny stuff to the ECU becomes a challenge as well.
You can upgrade to a smaller pulley to run more boost, and if you max out the Vortech or Rotrex blower, like you could max out a turbo, you can always upgrade to a larger unit.
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