S (stall place): During this stage the turbine speed is zero along with the impeller is rotating; the performance while in the stall point is minimum amount, about 50%, which means that 50 percent of the power coming through the motor is dropped through friction and dissipated as warmth; at https://torqueconverterclutch86283.bloginder.com/34919527/what-does-torque-converter-clutch-mean