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With the electric solenoid energized, and the stator fins in the closed position, torque converter stall speed increases to about 2,800 rpm to maximize off-the-line acceleration. As a car progresses down the road and less torque multiplication is necessary, the solenoid can be switched off. This opens up the fins and increases fluid friction inside the converter, reducing stall speed to roughly 1,800 rpm. View Related Article
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