there are all sorts of impeller /compressor configurations for turbos that all perform unique to itself..... some have small compressors, and larger impellers to give boost right off the line, but they die out in the upper rev band.... and they go to the other extreme
superchargers come in 2 basic configurations, roots type, and screw type. the roots type is typically cheaper to make/install, but ends up "robbing" the engine of 50-80 hp, whereas a screw type seems to keep working right on up the rev band.
hope that helps
gtp has a roots type, mustang svt has a roots type, ford gt has screw type, mercs have screw type.
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