2003 Ford Mustang Cobra Kenne Bell Twin Screw Supercharger - Mods For Mods Part 2
Power Curves--Eaton Roots vs. Kenne Bell Twin-Screw (Same Pulley Ratio)
Having already run the Eaton supercharger up in boost with the Dial-Ur-Boost pulley system from South Florida Pulley Headquarters in "Mods for 4V Mods, Part 1," we decided to take up where we left off and look for more power. The motor was first run with a 7.5-inch DUB crank pulley and a 3.2-inch DUB blower pulley to verify the baseline power. So equipped, it produced 537 hp at 6,500 rpm and 530 lb-ft at 3,500 rpm at a maximum boost pressure reading of 12.1 psi. As expected, the Eaton supercharger produced peak boost pressure in the mid range (4,200 to 4,800 rpm), but fell off to just 10.9 psi at 6,500 rpm. After a repeat run, we removed the Eaton supercharger and installed the Kenne Bell 422 twin-screw supercharger. We expected and were rewarded with big power gains from the more efficient twin-screw design. Equipped with near-identical pulley ratios (the Kenne Bell was actually spun slightly slower with a 3.25 blower pulley), the Kenne Bell supercharger pumped up the power to the tune of 682 hp. The timing and fuel were kept constant at 23 degrees and 11.8:1 using the F.A.S.T. system. The peak torque was up as well, from 530 to 595 lb-ft. View Related Article
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