Here's a subtle question about Mustang throttle bodies, and their relative location/position to superchargers. On Centrifugal systems like Procharger, Paxton and Vortech, the throttle body remains on the manifold, and is fed pressurized air from the discharge side of the supercharger.

On Twin-screw systems like Whipple, Kenne Bell and Saleen, the throttle bodies are located in the intake side of the supercharger. It seems to me that this design is more logical, as opposed to pressurizing the butterflies on centrifugal systems and trying to modulate 12 psi with your foot.

My question is, is there anything inherent, in terms of engineering principles, that would preclude re-locating the throttle body on the intake side of a centrifugal system?

 

First off, you say The butterfies in the TB on a centrifugal system are not modulating the boost of the blower. As a matter of fact, there is no way to modulate the boost on a centrifugal car. It is either building boost, or loosing it. People have talked about a blow off valve that regulates pressure at a set psi level. The idea here is that you could run a very small pulley and spin the blower faster, allowing boost to come in a lot sooner, then reaching a 'maximum' desired psi, and holding it steady there. ie, you could run a 20 psi pulley and it would only produce 10 psi, with a way to allow the blow off valve to modulate the release of pressure, holding it steady at a specified boost level.
But, to answer your question, the location of the TB means fairly little, logistics wise. The mass air sensor, on the other hand, is very sensitive to positioning, and positioning can mean a lot as far as how your incoming air charge gets read.