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If you're running a smaller pulley than stock you're certainly familiar with knock. Spinning the blower faster increases outlet temperatures thus causing knock. A stock M90 with a smaller pulley can see outlet temperatures of 300 - 350 degrees! We can reduce these temperatures by using an intercooler. We can also reduce the temperatures by improving the efficiency of the stock blower. By modifying the supercharger's outlet and porting/ polishing the inlet we can slightly increase boost and significantly lower output temperatures. All W Body Store blowers feature re-packed bearings, full intercooler compatibility, and are media blasted for a like new finish!
W Body Store VS1 Supercharger - This is our basic supercharger upgrade. The supercharger's outlet is reworked and beveled. This is a major contributor to dropping outlet temperatures. Milling each piece ensures a high quality finish far beyond what the home porter could achieve. This increases velocity and also improves adiabatic efficiency by reducing the amount of energy required to spin the rotors. W Body Store VS3 Supercharger - Our deluxe supercharger. As well as modifying the outlet of the supercharger we open up the inlet from 72mm to 75.5mm in diameter, polish and blend it. This further improves adiabatic efficiency and is ideal for setups where a larger throttle body will be used in the future. Optional Intercooler Outlet - Add an intercooler outlet if you're running an intercooler or plan on running one in the future. The intercooler outlets allows you to take full advantage of your intercooler's core.
Please allow 5 - 7 business days for shipment of this product.
Steven Bair writes: "I finally got the blower housing and throttle body installed and they work great. I cut my 0 - 60 time from 6.6 seconds to 6.2 and knock retard was almost non existent at wide open throttle to over 100 mph." 
Limitations to the stock blower - The Eaton M90 is a relatively efficient blower when compared to older Detroit Diesel roots blowers. The advantage to a positive displacement blower like the M90 is that it's constantly pushing out 90 cubic inches of air for every revolution resulting in a torque advantage off the line. This advantage also turns into a limitation as we can not increase the displacement of the blower. We are left to improve on adiabatic efficiency, which lowers heat, thus reducing knock and resulting in a denser air charge (more air passed). We do this 2 ways: - Porting & polishing the inlet - Porting and polishing the inlet increases velocity (the speed at which the air moves through it) which reduces the amount of energy required to move that 90 cubic inches of air. This requires less work from the motor to turn the supercharger and since the supercharger now doesn't require as much energy to spin it runs cooler, resulting in cooler outlet temperatures.
- Modifying & polishing the outlet - This is the most effective way of reducing outlet temperatures and when combined with our ported and polished inlet results in significantly cooler outlet temperatures than an equivilent M90 with a stock case. We have worked with several outlet designs and have used what we feel is the most efficient.
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