Quote:
Originally Posted by 82mm 4g63
You can definitely...what? Were you referring to my "above" post? Or greg's?
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Yes your post. You can definitely argue a turbo is silly on most cars because a supercharger does a similarly good job in a much simpler way. I forgot to mention the energy that backpressure costs the engine cannot be fully recovered by the turbine, so it's actually somewhat vague whether a turbo is actually more efficient than a supercharger. My guess would be with most exhaust manifold and turbine housing designs which don't utilize the impulse of the exhaust pulses very well, there probably is very little advantage if any at all.
@Dimman: Good to see other people are thinking about this too
In the second application that's definitely right, you need quite a large pressure drop to make a dual stage turbine (essentially what it is) worth it over a single stage turbine. With a small supercharger just one exhaust turbine stage would probably be pretty good. You can also add more turbine stages and gear them appropriately, as some of the aircraft engines did in the past I think, although using a turbocharger in conjuction with a second turbine for power generation would probably be simpler and better. Application 1 would be just to get a bit more energy out of every drop of fuel in a (high compression) naturally aspirated engine, upping power a little bit.