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I always wanted to see a turbocompound setup on a car. I know it's impractical because turbine speed and crankshaft speed have very different requirements (not just in magnitude but also in dynamics) but I believe an exhaust turbine produces more shaft horsepower than it takes in restriction. Additional energy can be had from the exhaust stream by enlarging the turbine outlet relative to the inlet, increasing pressure differential across the turbine. That's why a catback is so much more effective on turbocharged cars than on N/A cars. Mechanical constraints make a true turbocompound setup unlikely in a passenger car, but I think it would do good things if rigged to charge an IMA battery.
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