Automatic Transmission clutch losses?
Automatic Transmission clutch losses?
(OP)
Has anyone ever measured parasitic losses from the clutch packs of various Manufactures of Automatic Transmissions?
What I mean is say, with the transmission in top gear, the unapplied clutches will be coasting and washed in Transmission fluid, so there is a certain amount of drag or loss from this. Also I realize it will be different from transmission design and clucth pack size and design. I'm just looking for some close approximations.
Thank you.
What I mean is say, with the transmission in top gear, the unapplied clutches will be coasting and washed in Transmission fluid, so there is a certain amount of drag or loss from this. Also I realize it will be different from transmission design and clucth pack size and design. I'm just looking for some close approximations.
Thank you.





RE: Automatic Transmission clutch losses?
From SAE Paper 1999-01-1259, clutch pack drag parasitic losses in a typical AT represent about 75% of losses in the transmission. The total losses in an AT can be from 10% to 20% depending on the operating conditions.
Worst case, 75% of 20% would be 15%. Close enough for you?
Regards,
Terry
RE: Automatic Transmission clutch losses?
RE: Automatic Transmission clutch losses?