I'll have to dig around to find the hill climbing threads; it's a subject near and dear to my heart (as you might imagine).
I assume that superchargers are like turbochargers in that they can be designed to provide boost at various rpm levels. A smaller unit that is geared to spin up quickly can provide boost at pretty low RPMs. I drove a 1.1 liter turbodiesel Fiat in Italy that had effective boost at 1500RPMs.
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