S (stall position): With this level the turbine speed is zero plus the impeller is rotating; the efficiency from the stall point is bare minimum, all around 50%, meaning that 50 percent of the facility coming in the motor is lost by means of friction and dissipated as heat; at https://torque-converter-clutch19529.humor-blog.com/33169475/the-best-side-of-torque-converter-clutch