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My idea was just the opposite of the belt driven turbo... two small centrifugally adjustable pulleys, with a belt/chain driven between them... the exhaust wheel spins up, and the pulleys gradually change gearing based on load and available torque generation.
I had originally thought about using a VNT from a Chrysler car for this, since they're capable of spooling at very low speeds, and holding full spool without over-boosting for a relatively long RPM range.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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