S (stall issue): in this issue the turbine velocity is zero along with the impeller is rotating; the effectiveness in the stall stage is bare minimum, about 50%, which suggests that fifty percent of the facility coming through the engine is shed by means of friction and dissipated as warmth; https://torqueconverterclutch75296.mdkblog.com/40099798/torque-converter-clutch-fundamentals-explained