> exhaust energy recovery turbine That would be a turbocharger. And electric turbocharger and driveshaft turbochargers are also a thing. The problem with turb

> exhaust energy recovery turbine That would be a turbocharger. And electric turbocharger and driveshaft turbochargers are also a thing. The problem with turbo is backpressure from the exhaust energy recovery part, which compromises some other engine tuning. And the problem with traditional superchargers is low efficiency + high boost in low RPMs, same issue. A centrifugal supercharger is relatively efficient and basically only does anything at high RPM, so from what I understand it won't "upset" the compression of the rotary or highly tuned NA engines as much as a traditional turbo/supercharger.