S (stall point): With this issue the turbine speed is zero and also the impeller is rotating; the effectiveness during the stall point is bare minimum, around 50%, meaning that 50 percent of the ability coming with the motor is dropped by way of friction and dissipated as heat; at https://torque-converter-clutch79123.blog-eye.com/34109637/how-much-you-need-to-expect-you-ll-pay-for-a-good-torque-converter-clutch