S (stall level): in this issue the turbine velocity is zero and the impeller is rotating; the efficiency in the stall level is minimal, about 50%, meaning that 50 percent of the power coming through the motor is lost by means of friction and dissipated as heat; at this time https://torque-converter-clutch63185.bloggerswise.com/41352008/the-best-side-of-torque-converter-clutch