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Eaton Roots vs. Kenne Bell Twin-Screw (11 psi)Like the Eaton, the positive-displacement twin-screw blower from Kenne Bell produced immediate boost response and a broad torque curve. Looking at the graph, you might be tempted to think that the Kenne Bell twin-screw is more efficient at higher engine speeds than the Eaton (it is), but less so at lower speeds. The reality is that the twin-screw was so much more efficient, we had to slow down the twin-screw by nearly 2,000 rpm (compared to the Eaton) to keep the boost pressure from exceeding 11 psi at the top. Running a maximum boost pressure of 11.9 psi, the Kenne Bell pumped out 629 hp and 525 lb-ft of torque.