<b>Zorak</b>
I reccomend you read Maximum Boost by Corkey Bell.
There are no hard and fast rules that says 10 PSI = 30 HP. There are just too many variables in the HP equasion. Compression ratio, Intercooler efficency, Compressor efficency, ambient air temp, engine tuning...etc..etc..etc..
Getting 300 HP out of a Beta motor with a supercharger would be DAMN hard. You would need to use a centrifical supercharger, as the current Roots type supercharger for the beta motor are just not designed to move enough air for 300 HP. A centrifical supercharger is basically half of a turbo, driven by a belt of the engine crank. In order for them to work, they need to be spinning at least 50,000 RPM to START making boost, and upwards of 120,000 RPM for serious power. Since your belts don't move that fast, they are driven of internal gears. The belt turns a pulley, then internal gearing multiplies the speed of the pulley up to the stratsopheric RPM levels needed by the centrifical supercharger. This creates DRAG on the engine...lots of it, so for each HP the supercharger makes, it is eating some of it to keep the supercharger spinning. centrifical units have more "drag" than "roots" type superchargers. Also, centrifical superchargers are usually only effective within certian RPM ranges (depending on the size of the unit you choose). This means that you wont see much of a gain untill the centrifical superchager spins up to the right speed. The advantage of the centrifical supercharger is that they can be adapted to just about any engine, and allow the use of an aftercooler (intercooler to most people).
There are NO commercially available supercharger kits in the USA at this time. RimmerSuperchagers did sell an eaton "roots" style, but they have since gone out of business. Twice.
You can order the Alpine Supercharger from South Africa, which is also an eaton "roots" type. You can also order the AutoRotor Twin Screw "roots" type supercharger from C.A.P.A. In austraulia. However, both would probably not get you to 300 HP. C.A.P.A. also sells centrifical superchargers, so they would be the place to start if you are really set on using a centrifical supercharger.
If your goal is really 300 HP, I do reccomend a turbocharger rather than a supercharger though. Especially for a daily driver. centrifical superchargers tend to be really "peaky". meaning their power comes on suddenly, and sharply. This makes driving the car in anything but a straight line somewhat difficult.
If you want questions answered on the various turbo and supercharging kits, I do suggest you e-mail or call the various manufacturers, as they would know their product best. Just feel free to use the forums as a reality check on the claims and such made by the various companies. Alpine claims over 250 Wheel HP on their turbo kit. Yet with their kit, which was installed by Alpine, I only showed 174 HP and 173 torque at the wheels.
<hr width=60% noshade size=1 align=left>Leave it to Random to Needlessly complicate things.
