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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 08-01-2006, 10:43 AM   #1 (permalink)
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Torque Converter Lockup

Anyone ever used one of those aftermarket torque converter lockups like the one listed below? (scroll down the page after you click on the link)

I have heard people really like them and I have heard that some people say they are not worth it.

What do they do exactly and why do people install them?

<font color="blue">T/C Lock Override switch with LED</font>
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Old 08-01-2006, 03:30 PM   #2 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
What do they do exactly and why do people install them?

[/ QUOTE ]

The torque converter in front of your 4R100 automagic tranny has a computer-controlled clutch to lock or unlock the torque converter to the tranny. When the torque converter is locked, then the engine crankshaft is tied almost directly to the driveshaft that drives the rear wheels. But with the torque converter unlocked, the only thing that ties the engine to the rear end is a bucketfull of ATF inside the torque converter, so the pickup can almost free-wheel down the mountain as that ATF sloshes around inside the torque converter.

The PCM in most '99-up PSDs will lock the torque converter at about 37 MPH when accelerating, and unlock it at about 37 MPH when slowing down. But it will also unlock the torque converter any time you apply the brakes. Some PCM codes will relock the PCM after you get off the brakes if you are still going more than 37 MPH. Others won't relock the torque converter unless you mash on the go pedal while going at least 37 MPH.

For towing, you want that torque converter locked any time you are coming down the mountain with a heavy trailer pushing on you. Even if you apply the brakes to slow down a bit, you want that torque converter to stay locked. The locked torque converter combined with the coast clutch in the tranny will give you at least some engine braking. And if you have an exhaust brake, then the locked torque converter can add a lot of engine braking.

So the main purpose of a torque converter lockup switch is to assist with braking by increasing engine braking when being pushed down the mountain by a heavy trailer. The only caveat is you must remember to unlock it every time before your speed drops below about 20 MPH. Else it would be like coming to a stop in a stick shifter without mashing the clutch. Not a good. [img]/ubbthreads/images/graemlins/crazy.gif[/img]

With my PCM code and a really-good coast clutch in my tranny, I don't need an exhaust brake or a torque converter lockup switch to tow my 8,000-pound 5er all over the USA - including the so-called mountains back east and the real mountains out west. But with a heavier trailer I would. Or with a different PCM code, or with a less-than-perfect 4R100 tranny, I might.
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Old 08-01-2006, 03:51 PM   #3 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
37 MPH when accelerating, and unlock it at about 37 MPH when slowing down

[/ QUOTE ]

Not true

[ QUOTE ]
Some PCM codes will relock the PCM after you get off the brakes if you are still going more than 37 MPH

[/ QUOTE ]

Oh? Which pcm codes would that be?

[ QUOTE ]
The locked torque converter combined with the coast clutch in the tranny will give you at least some engine braking

[/ QUOTE ]

Might wanna make it clear that you have to have the OD button locked out for this to happen as well.
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Old 08-01-2006, 03:57 PM   #4 (permalink)
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Re: Torque Converter Lockup

probablecause,
Smokey is right, my trans program will lock the converter at a rather slow speed, but will unlock between 3 and 4 up shift or down shift and you get RPM rise and power loss. I built my own (not difficult) I have 3 LEDs one for Lock Up from the PCM another showing I locked it and the last when the 18K is on. Smokey is right about forgetting to turn off.... [img]/ubbthreads/images/graemlins/biggrin.gif[/img] it will kill the engine if you come to a stop with it locked. [img]/ubbthreads/images/graemlins/phoney.gif[/img]

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Old 08-01-2006, 04:03 PM   #5 (permalink)
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Re: Torque Converter Lockup

Housted : How did you build your own. Any plans/diagrams?
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Old 08-01-2006, 04:54 PM   #6 (permalink)
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Re: Torque Converter Lockup

http://www.dieselinnovations.com/techfiles/tclockup.pdf
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Old 08-01-2006, 05:06 PM   #7 (permalink)
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Re: Torque Converter Lockup

My converter doesn't unlock in overdrive when I let of the pedal or touch the brakes. It will coast with the converter locked until a bit under 40mph, and then unlock and downshift to 3rd at the same time. It will also stayed locked in 3rd (until around 30mph) if you have the OD off button enabled. This is VDH2 ecm code. The manual lockup switch would be useful if your computer unlocks your converter anytime you hit the brakes. That would get annoying quick.
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Old 08-01-2006, 10:13 PM   #8 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
[ QUOTE ]
37 MPH when accelerating, and unlock it at about 37 MPH when slowing down

[/ QUOTE ]

Not true


[/ QUOTE ]

Okay, so what is true?

[ QUOTE ]
[ QUOTE ]
Some PCM codes will relock the PCM after you get off the brakes if you are still going more than 37 MPH

[/ QUOTE ]

Oh? Which pcm codes would that be?

[/ QUOTE ]

I don't know about other PCM codes but my original NVK3 and my current MRT3 will both relock after I brake going down the mountain at over 60 MPH. I know some don't by reading this website for the last 7+ years.

[ QUOTE ]
[ QUOTE ]
The locked torque converter combined with the coast clutch in the tranny will give you at least some engine braking

[/ QUOTE ]

Might wanna make it clear that you have to have the OD button locked out for this to happen as well.

[/ QUOTE ]

Could be. I never tow down the mountain without the OD button locked out. [img]/ubbthreads/images/graemlins/cool.gif[/img] I can't imagine anyone being that bad of a driver.
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Old 08-01-2006, 10:21 PM   #9 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
37 MPH when accelerating, and unlock it at about 37 MPH when slowing down

[/ QUOTE ]

Not true

Sure nuf. Well, not totaly. Under acceleration, lockup mph can vary. With my code, UNK1, durring WOT my TC will lock before the 1/2 shift, which is ussually under 37 mph..

[ QUOTE ]
Some PCM codes will relock the PCM after you get off the brakes if you are still going more than 37 MPH

[/ QUOTE ]

Oh? Which pcm codes would that be?

Well, UNK1 for starters. Mine does it all the time. As long I am above 37 mph, tap the brakes it unlocks, let er coast and it will re-lock.

[ QUOTE ]
The locked torque converter combined with the coast clutch in the tranny will give you at least some engine braking

[/ QUOTE ]

Might wanna make it clear that you have to have the OD button locked out for this to happen as well.

Nope. It is just more noticable in 3rd.
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Old 08-01-2006, 10:26 PM   #10 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
My converter doesn't unlock in overdrive when I let of the pedal or touch the brakes. ... This is VDH2 ecm code. The manual lockup switch would be useful if your computer unlocks your converter anytime you hit the brakes. That would get annoying quick.

[/ QUOTE ]

Those DP tunes on your X-Cal have more than likely changed the way the TC locks and unlocks. Return programming to stock and it would imagine it would unlock when you hit the brakes.
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Old 08-01-2006, 11:01 PM   #11 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
Might wanna make it clear that you have to have the OD button locked out for this to happen as well.

Nope. It is just more noticable in 3rd

[/ QUOTE ]

If the tranny is in OD the coast clutch will be disengaged. If you lock out the OD button the coast clutch will engage.

Put a light on your torque converter and see if it relocks or is actually unlocking when you hit the brake.
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Old 08-01-2006, 11:36 PM   #12 (permalink)
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Re: Torque Converter Lockup

Quote:
Put a light on your torque converter and see if it relocks or is actually unlocking when you hit the brake.

It's the on one the left.!
Cut and paste it. Can't get the links to work right now.
www.rlarkin.clearwire.net/Truck/esof.jpg
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Old 08-01-2006, 11:46 PM   #13 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
[ QUOTE ]
My converter doesn't unlock in overdrive when I let of the pedal or touch the brakes. ... This is VDH2 ecm code. The manual lockup switch would be useful if your computer unlocks your converter anytime you hit the brakes. That would get annoying quick.

[/ QUOTE ]

Those DP tunes on your X-Cal have more than likely changed the way the TC locks and unlocks. Return programming to stock and it would imagine it would unlock when you hit the brakes.

[/ QUOTE ]


Even with my stock VDH2 programming it is this way...
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Old 08-02-2006, 09:09 AM   #14 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]
[ QUOTE ]
Put a light on your torque converter and see if it relocks or is actually unlocking when you hit the brake.

[/ QUOTE ]


It's the on one the left.!
Cut and paste it. Can't get the links to work right now.
www.rlarkin.clearwire.net/Truck/esof.jpg

[/ QUOTE ]

Fixed it

What is your PCM code again?
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Old 08-02-2006, 10:06 AM   #15 (permalink)
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Re: Torque Converter Lockup

[ QUOTE ]

What is your PCM code again?

[/ QUOTE ]

UKN1

In my above post I got a little dyslexic.

And I verified it this morning on the way to work.
As long as I am above 50 mph, it will unlock with a tap of the pedal, and imediately re-lock.
Below 50 it will stay off.
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