Comments

The device would have to come after the catalytic converter(s). Those are temperature dependent. Robbing heat energy from them would reduce they're effectiveness or eliminate it. But the further from the engine you get, the more heat is lost from the exhaust gasses. Also, harnessing exhaust pressure gasses leads to less efficient engine performance (back-pressure reduces overall horsepower). The device would also add weight to the vehicle. Prototyping is necessary to verify the gains from the steam turbine would overcome the negatives. Still, very much worthwhile to test. I'm interested in using small gas turbines to charge batteries and capacitors to power a vehicle instead of Internal combustion. Far lighter, more efficient, but they don't respond quickly enough to be used as a main drive in an automobile (ask Mercedes).