S (stall stage): On this level the turbine velocity is zero and also the impeller is rotating; the performance in the stall place is least, all around 50%, which implies that half of the power coming from the engine is missing as a result of friction and dissipated as heat; https://torqueconverterclutch52839.smblogsites.com/34266030/5-simple-techniques-for-torque-converter-clutch