S (stall place): in this level the turbine velocity is zero plus the impeller is rotating; the efficiency while in the stall issue is least, all around 50%, meaning that 50 percent of the power coming with the motor is missing via friction and dissipated as heat; at this time https://eduardoaegfd.activablog.com/33380528/5-simple-techniques-for-torque-converter-clutch