S (stall issue): Within this level the turbine speed is zero as well as impeller is rotating; the effectiveness from the stall stage is minimum amount, close to 50%, which suggests that 50 % of the power coming in the engine is missing by friction and dissipated as heat; at https://torqueconverterclutch65208.p2blogs.com/33146476/a-secret-weapon-for-torque-converter-clutch