Actually, not exactly true, one thing that is nice about the "supercharger" being either roots-style or centrifugal is that the power curve is so friggin' LINEAR! The more you mash the pedal, the more power is accumulated!
To speak VERY briefly on this subject, (for a change) The supercharger is JUST LIKE a turbo on the compressor side (shiny part) and works exactly the same- forcing air into the intake ports as quickly as possible. Now, that being said, again- you don't make power with a supercharger, OR a turbo, OR nitrous oxide! Those things are put in engines only to be able to increase the FUEL DELIVERY into the combustion chamber! Nothing else! The fuel is what burns, and the "forced induction" system only allows for more fuel to be used.
The only real drawback to the s/c (blower if you drive trucks-ack) is the parasitic loss of power created by turning the little shaft that runs the s/c. You have to USE power to MAKE power on the s/c setup. (You really wouldn't believe the drag on that pulley till you felt it for yourself-believe me)!
So, how does a "blower" work? (Centrifugal- like a turbo. Roots-style is different) Pulley on pulley-side of engine on a belt turns shaft across motor, gears in s/c that connect to shaft spin blades inside s/c. That creates more air to ADD MORE FUEL via ecu, injectors, fuel-pressure regulator, or a combo. of all-
And that's how you make more power! YEE HAW!!!!
Sorry about the lengthy post (DAMMIT! Why can't I have one-sentence replies! LOL)!
I hope that sheds some light!
PeaceOut! <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt=':cool:'>