S (stall point): With this issue the turbine speed is zero plus the impeller is rotating; the efficiency within the stall stage is minimal, all around 50%, which suggests that 50 % of the ability coming from your engine is misplaced by means of friction and dissipated as heat; at https://torque-converter-clutch31963.canariblogs.com/helping-the-others-realize-the-advantages-of-torque-converter-clutch-49107476