Because the turbine velocity lags constantly guiding the impeller (pump) pace, the velocity ratio is fewer than one. Which means There is certainly friction from the transmission fluid which ends up in electric power losses. The torque converter clutch solves this by locking the turbine towards the converter’s housing, thus https://torque-converter-clutch59257.elbloglibre.com/33954910/details-fiction-and-torque-converter-clutch