Somebody plz school me. - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-31-2009, 05:18 PM Thread Starter
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Somebody plz school me.

Ok I want to learn more about torque converters. What do they exactly do and what is this stall speed i hear about? Thanks

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post #2 of 11 Old 03-31-2009, 05:23 PM
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Its basicly a clutch like part for an automatic.

Stall speed is the rpm that a TC has to spin in order for it to overcome a given amount of load and begin moving the wheels.


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post #3 of 11 Old 03-31-2009, 05:25 PM Thread Starter
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LoL i need more details i guess. I have no idea why I dont understand this. So you mean it meets the stall speed before it changes gear?

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post #4 of 11 Old 03-31-2009, 05:27 PM
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The torque converter is designed to act as a fluid coupler that can engage and disengage with the increase and decrease of engine rpm. When the vehicle is not in motion while the engine is running the torque converter is in action. The torque convert converts fluid pressure to lock the converter output shaft. Once the shaft has locked the transmission receives engine power. At minimum engine rpm fluid pressure is low and the torque converter allows the engine to "freewheel" from the transmission.

When the converter receives the power from the engine it transfers power to the transmission. The torque converter also has the ability to multiply torque when the engine is under power by multiplying fluid pressure through a component called a stator.

The stator allows the smooth transition from standing still to motion of the vehicle. The torque converter is filled with automatic transmission fluid pumped in from the fluid pump of the transmission. There is a measured amount of heat generated by the torque converter. This is why a transmission fluid cooler is necessary, usually installed inside the engine radiator. Most torque converters are equipped with a clutch that has the ability to lock up as the vehicles reaches cruising speeds. The clutch is activated by a fluid control solenoid inside the transmission that is activated by the ECM . Transmission fluid passes through the torque converter and needs to be as clean as possible to ensure proper operation and limit malfunctions. Always observers manufacturers recommended transmission service intervals.

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post #5 of 11 Old 03-31-2009, 05:29 PM
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Well Im no Transmission Guru, But I read this on the DG and it stuck.

RPM's under stall the converter is slipping. RPM's over stall and it kind of like the converter being locked or not slipping.


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post #6 of 11 Old 03-31-2009, 05:31 PM Thread Starter
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That helps a little bit. It seems kinda complicated. I got my extra trans today with a TC and I want to build it up. So im trying to find out about them.

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post #7 of 11 Old 03-31-2009, 05:32 PM Thread Starter
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So if I got a high stall 2100 does that mean my truck stays around 2100>?

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post #8 of 11 Old 03-31-2009, 05:37 PM
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if you got a 2100 stall it means your truck will not engage in gear till your motor hits 2100 rpm. kinda like a how a snowmobile engages when you hit the throttle.

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post #9 of 11 Old 03-31-2009, 05:39 PM Thread Starter
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So that would be real bad then. thats way to high.

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post #10 of 11 Old 03-31-2009, 05:42 PM
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for everyday driving it would probably get annoying but racing it would be sweet

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