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Just saying by the way, assuming electric supercharging systems haven't taken off by the time I get around to this, I intend to someday build a blowdown turbine for an NA engine connected to the crankshaft directly via speed reduction using a large twin scroll turbocharger and removing the compressor side. I'm thinking a GT47 or so geared down 9:1ish to a 2L engine. At 7000rpm or so it should hopefully make a healthy few horsepower, with some luck it could hit 10hp. It's okay that the turbine spins too slowly at lower rpm, since blowdown losses are lower at low rpm anyways.
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