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If your interested in "blowdown" turbines or energy recovery check out a Detroit DD15. One is in my truck and it use a turbine connected to the crankshaft running off the exhaust. They have been used in limilted numbers of engines. I dont know that it really helps the fuel mileage.
It separate from the turbocharger system to boost the engine.
I dont know much about the whole subject but I can tell you my old engine would pull down to 1250 rpm and you had to shift, this one will pull down to 1000 rpm before you have to shift. Mind you anything over 1500 rpm is a waste on this engine. (14 litres displacement) There is about 300 rpm between gears. Most truck engines operate in very low rpm range like this to get good mileage.
I think the turbine does help the low pulling power, I have never had on the pulls this low.
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