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Location:
Brisbane
Registered:
May 2002
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Re: Compound turbo
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Tue, 15 July 2003 23:31
 
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The whole idea of a twincharge setup is to eliminate the inefficient supercharger at high rpm, when the far more efficient turbo takes over. Having a supercharger spinning past its efficiency range is going to sap a lot of power for no reason!
I gave a lot of thought to this idea a few years ago, and here's what I came up with. Consider a normal turbo setup, but with a positive-displacement supercharger pushing air into the turbo inlet. When the turbo spools up, a clutch disengages the supercharger and an air bypass opens so the turbo isn't trying to draw air through the supercharger. All the advantages of a turbo but without any lag!
It would be complex to set up and difficult to make the transition smooth, but I reckon that's the best compromise. So, anyone wanna try it? 
As for "compound turbos", that usually means two or more turbos joined in series. The idea is to get huge boost pressure without overspeeding a single turbo. I've never heard of it being used on anything but large diesels though.
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