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torque converter pressure


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peterraymond
New User

Sep 12, 2019, 10:08 AM

Post #1 of 3 (93 views)
torque converter pressure Sign In

(1) For a project I need to know what the typical pressure is inside the torque converter and (2) I'd be interested in knowing how it's controlled. The pump creates the pressure, but that supplies flow to other circuits too. I wonder if there is an orifice, or something else, to specifically lower the pressure to the torque converter. As I understand, pressure in the torque converter creates a force trying to push the engine crankshaft forward, so it seems like you don't want the pressure in the converter to be too high. And (3), is there an easy way to measure this particular pressure for most transmissions?

Anyway, thanks for any help on this.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2019, 10:24 AM

Post #2 of 3 (91 views)
Re: torque converter pressure Sign In

The torque converters job is to allow for pressure reduction during vehicle stop which allows the car to sit still in drive without stalling. As the RPM increases, the slippage reduces until it reaches a specific RPM the converter will stop the slippage and allow the pump to operate at full pressure. This is called the stall speed of the converter.

Gary may chime in with a better explanation.



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(This post was edited by Hammer Time on Sep 12, 2019, 10:25 AM)


gsferraro
Enthusiast

Sep 12, 2019, 5:04 PM

Post #3 of 3 (66 views)
Re: torque converter pressure Sign In

Hello,
The torque converter is a fluid coupling. The pressure inside the converter may be the same as line pressure in the transmission. If at an Idle, the pressure will not be that much because the car is not moving, maybe around 60psi, as you step on the gas, pump pressure will increase and pump more fluid into the converter which will transmit to the wheels and make the car move. The actual pressure inside the converter may vary as line pressure varies inside the transmission. If you want to know what the pressure are inside the transmission you have to hook up a pressure gauge (0-400psi) to the line pressure port of the transmission. Hope this helps. Fluid is constantly flowing in and out of the converter, this fluid also must be cooled because how the fluid flows inside the converter generates a lot of heat. Gary






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