Torque Converter Stall Speed

ixtlan

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That is what the tech manuals state for them.
The values are with the Locking Clutch disabled during the testing. So those would be the true stall speeds.
That would also be why there is a locking clutch in the TC controlled by the PCM.
 

Benwhite911

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Is it possible that the locking clutch is programmed to engage at a lower RPM? It has always felt like the engine and trans would lock up around the 1500 to 1800 range. If so, is it possible to disable that on our own with a tuner?
 

ixtlan

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I know of no way to do it with a tuner. Perhaps someone that writes tunes could answer that.
The PCM controls when it engages but what it uses to make the decision I cant say. My guess is it is some sort of load logic in the PCM.
As far as testing the clutch you disable OD and drive steady around 40-50 mph and tap your brake while watching the Tach.
The Tach will increase slightly and then decrease again. That checks the locking clutch disengaging and engaging.
 

RocketcarX

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That is what the tech manuals state for them.
The values are with the Locking Clutch disabled during the testing. So those would be the true stall speeds.
That would also be why there is a locking clutch in the TC controlled by the PCM.
You are confusing "stall" for "lock up". The OP asked what the lock up is. Ford doesn't measure converters in traditional RPM but instead as a K Factor, I would be interested in seeing your source.
 

RocketcarX

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I know of no way to do it with a tuner. Perhaps someone that writes tunes could answer that.
The PCM controls when it engages but what it uses to make the decision I cant say. My guess is it is some sort of load logic in the PCM.
As far as testing the clutch you disable OD and drive steady around 40-50 mph and tap your brake while watching the Tach.
The Tach will increase slightly and then decrease again. That checks the locking clutch disengaging and engaging.
The converter will lock with OD defeated? I would double check that.
 

ixtlan

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The stall speeds are from 307-01-3 Ford Mustang tech manual.
As for the OD disabled it just makes the clutch disengage / engage easier to see.
I think the OP is asking if the lockup clutch can be controlled by a Tune to engage at a specific RPM.
At least that is the impression I got from the post.
 

Benwhite911

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Thank you, to the both of you for this info. My original question was regarding the stall speed of the converter. It then morphed into whether or not we can alter the converters lock up on our own. Again thank you to the both of you.
 

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