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Apparently turbo kits are more efficient than superchargers because the engine has to spin the supercharger. The question is how much HP is going to spin an Edelbrock SC or JRSC? I can’t imagine that it is a lot—maybe 20hp—but if we are talking about what the engine can take then that will be the same for a turbo or a SC, but as measured at the wheels, the turbo will handle more to the wheels. Both might push the engine to 350hp, but the turbo might show 300whp and the SC might show 280whp.
From what I’ve read too, a supercharger is harder on the engine; downshift and the engine throws the supercharger to instant high rpms, so instant boost or instant torque. Some have even suggested low end torque is hard on the engine; I think specifically the rods. Maybe that is why the torque dip is there because it decreases forces at low rpms.
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