S (stall point): On this point the turbine speed is zero as well as impeller is rotating; the efficiency from the stall level is least, about 50%, which suggests that 50 % of the facility coming in the motor is shed through friction and dissipated as warmth; at this time https://torqueconverterclutch86283.theisblog.com/34467392/the-best-side-of-torque-converter-clutch