S (stall level): During this point the turbine velocity is zero and also the impeller is rotating; the efficiency while in the stall stage is least, around fifty%, which means that 50 % of the power coming from your engine is lost by way of friction and dissipated as heat; https://torqueconverterclutch19640.tokka-blog.com/34236455/the-torque-converter-clutch-diaries