Supercharger
While understanding how a supercharger works is slightly easier than a turbo, it's still great to learn the basics on what affects what and how to maximize your hard work. The following link will give you a great rundown on the basics of superchargers.
How a supercharger works
Types of Superchargers
Roots -positive displacement units, which means every rev of the blower pumps out a fixed volume of air, regardless of the blower's rpm. Result is that boost comes on instantly. Most applications will produce full boost at 2000-2500rpm. Boost can be increased or lowered by changing pulley size. Best to under drive larger unit than to overdrive smaller one.
Centrifugal- Most popular type for fuel injected engines. Provides airflow proportional to blower rpm, thus full boost comes as high rpm.
Twin-screw- positive displacement, similar to roots. The difference is that this type uses twin screws instead of lobed rotors to compress air, works best when overdriven.
Properly Sized Intercooler Piping
Each Supercharger and intercooler use a certain amount of air, you should always try to set up a close ratio of each. One way you have to do this is to have piping that runs from the intercooler, if chosen to use is properly sized. If your pipes are too large, The smaller piping will mass flow, and increase velocity. The problem with smaller piping is that it can choke the engine. You must research this and find a nice medium. The size of the piping a Supercharger uses is not as delicate as that of the turbocharger, but the velocity must more finely tuned with a Super Charger. The largest concern with the piping is the length. A one by one inch pipe will flow thousands of cfm, but if it's 12 inches long it will only flow a few hundred at most. For the intercooler piping, in general most people use piping that’s 25% larger than your compressor output. The largest limitations is the throttle body, make sure the throttle body can keep up with amount of air flowing into the engine.
Picking the right Super Charger
When considering your Supercharger, you must first decide which of the types you would like to have. This will alter the set up of the unit. Don't pick a Supercharger that is too small or too large. But it is better to under stain a larger unit that it is to overstrain a smaller unit. Also look at how much boost each of the different units creates on a low, and on a high boost pulley. The larger and the heavier the pulley is, the slower it spins, which in turn creates less boost.