2002_Ford Mustang GT Upgrades Kenne Bell Twin Screw Supercharger Kit
Vacuum Loss (6, 9, 11 psi)
Like their distant positive displacement cousins the roots superchargers, twin-screw superchargers are ultra-sensitive to inlet restrictions. According to testing performed by Kenne Bell, each 1 inch of vacuum present in the inlet system of the supercharger can be worth ? pound of boost pressure with the resulting power gain associated with the extra boost pressure. While running the new 4.6 twin-screw kit, the gang at Kenne Bell took the liberty of monitoring and data logging the vacuum present in the inlet tract. Not content to simply monitor the vacuum present at one boost level, they kept track of the inlet restrictions at various boost levels to illustrate the fact that restrictions become more pronounced as the boost (and power) level are increased. This graph illustrates the vacuum present at 6, 9 and 11 psi. Note as the boost pressure increased, the vacuum present in the stock inlet system also increased. This was a sure sign the stock air intake system (air box, MAF, inlet tube and throttle body) was never designed to flow over 400 hp worth of air. Replacing the stock components with a Kenne Bell cold-air, 90mm MAF, dedicated inlet tube and 75mm throttle body improved the power output by as much as 26 hp at 11 psi. View Related Article
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