S (stall place): With this stage the turbine speed is zero plus the impeller is rotating; the effectiveness inside the stall position is least, all around 50%, which means that fifty percent of the power coming through the engine is lost by way of friction and dissipated as heat; at https://torque-converter-clutch19630.bleepblogs.com/34443914/5-simple-statements-about-torque-converter-clutch-explained