Stick with the roots type (magnacharger, whipple, kenne bell, etc.). ATI/Procharger, Vortech, Powerdyne, Paxton, etc., are all centrifugal superchargers. Their boost curve is rpm based meaning they don't make maximum boost until redline, where a roots type blower makes boost right off idle and has a nice, flat torque curve like turbos.
Plus, centrifugal superchargers are attached to the front of the engine with brackets, like an alternator or power steering pump. These brackets tend to flex because they have problems with belt slippage, so people make the belts tighter and tighter, then the bracket flexes and tosses the belt off (or destroys it), which could strand you. Roots type superchargers sit on top of, or are part of your intake manifold, so no bracket to flex.
The only downside to the roots styles (for your application anyway) is that they have a limit to the power they can make, but it should be more than enough power for what you guys are doing. I don't know for sure, but I'd guess in the 500-700hp range. So for your application, this couldn't really be considered a down side.
They make very large centrifugal superchargers that can make 2500hp.
Roots type is the better choice for your application.
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Rad Craig,
Induction Concepts
High Performance, Twin Turbo Systems
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