if you meant what's a positive displacement supercharger it is either the rootes or twin screw type (plus other weird ones that nobody uses) supercharger that use their rotors to push the internal displacement of their fluid along (in this case air) (and compress by forcing the air through a contration) unlike centrifugal supers (including turbos except of course they aren't mechanically driven) which spin the fluid and use centrifugal forces to force it through the outlet.Originally Posted by Jay 535i
no increase in low down torque........ centrifugal is less effecient than a turbocharger yet gives you no increase in low rpm torque like a positive displacement. basically a centrifugal is a turbo with a mechanical drive instead of a turbine. Therefore i don't want a centrifugal. and I don't really want a turbo either (not for technical reasons so much as to be different), i'd prefer a positive displacement super because m50 doesn't have much low rpm torque, twin screw is probably the number one candidate but rootes is okay as well.
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