have you looked at a turbo setup with a blow through carb?
Correct me if I'm reading the rule wrong, but if Dick's running vintage tin, I don't think he's permitted to run a turbo on a vintage flathead four.
That's why I said I didn't know his rules..
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As for the holding the curve question...
If you look at the power curve (dyno graph) where a blower builds boost (just as a #'s example) say from 2k-5k hitting max boost of say 8psi at 4800 creating max hp... A turbo, will hit max boost earlier, holding a higher hp for longer... but that's out of the question anyway, as someone pointed out it's not within his rules.
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And it's been proven time and time again. Turbo's are more efficient then blowers. More power, with less boost. The blower belt adding drag to the engine as more boost is created and belt slip = using power to make power.
Where as a turbo, it's simply (as your aware) air pushing air. Create more air, more air gets pushed.. it's less power to move a turbo (and more efficient!) for the simple fact as your not losing any through belt slip or drag as the RPM's get higher as well as the boost. Turbo is a constant..
Of course, this is a mute discussion as he can't use one anyway lol