Cheers narlo, thanks for the info. There are superchargers on the market that are about the same size as an alternator, centrafugal superchargers, these are like a gear driven Turbo using a gearbox to spin a compression rotor up to 50-60,000 rpm to create the boost.
This type of supercharger doesent produce lots of boost low down , which can be a benefit to FWD cars to be honest, save the transmisson etc.
The supercharger i bought is a Sprintex, it was/is a very efficent compressor that adds little heat to the inlet charge, so no intercooler is nesscessary, the CR ratio can stay as standard provided the engine doesent start detonating, i would have to limit the boost like Ian says by setting the charger pully ratios correctly and posibly using a bleed valve to get rid of excess boost.
Of course to run very high boost, the engine would have to be built appropriately.
My problem at the moment is the sheer size of the sprintex... ITS BIG... i need to get my mechanic to look at how to fix the charger to the engine, will have to weld brackets and stays around inbetween the exhaust manifold, not easy i fear. but damm interesting