Manual Lock Up Switch, with relays

[Mobius1]

How/Where would this be installed? I understand the schematic, would this be preassembled and plug in somewhere?

 

[p-Bar]

Yes it will go in a port on the trans and when it senses low pressure it will send signal to your switch relay which you will need to put together or I can do it for a fee.

 

[Mobius1]

Yes it will go in a port on the trans and when it senses low pressure it will send signal to your switch relay which you will need to put together or I can do it for a fee.

I am ok with that. I want to be as close to plug and play as possible

 

[p-Bar]

OK looking for one more buyer now

 

[Mobius1]

Great, can't wait!

 

[Mobius1]

Bump!

Someone sign up!

 

[Mobius1]

Can't believe no one else wants to do this?

 

[sag2]

Actually I have been towing without it, and it really isn't a big deal not having the pressure switch. Perhaps some day, but right now I'm fine with the current setup.

 

[Mobius1]

I was looking to get it more for fun, playing around

 

[WalterJ]

Actually I have been towing without it, and it really isn't a big deal not having the pressure switch. Perhaps some day, but right now I'm fine with the current setup.

sag2: Greetings;

I have a Banks exh. brake & the TC lockup drops out below 1500rpm. I think it's because the line press. is too low then to be effective at the TC?

If you don't mind another query; My rebuilt 48RE was done to handle my RV towing needs & has worked fine for a year. Lately I'm seeing some numbers on my Trans Slip display [Banks Automind Tuner w/PDA]. My shop reports not seeing anything RPM related to support that PDA display. The transmission was dropped & stator pump assy checked for leaks, and a new Precision Triple Disc TC was installed as well. Got a clean bill of health.

On interstate few days ago @ 65mph & slowly floored it, backing off @ 115mph. The Trans Slip display showed up to "20" [RPM slip]. An acquaintance said WOT unloads the TC lockup. Sound right to you? Whilst hauling up a grade & I decide to use full throttle [in Tow Haul], will the TC then unlock?

My current setup is calibrated to Lockup above 50mph & dropout below 45mph. Is this reasonable for towing. Should I consider maintaining Lockup <45mph?

Thanks so much for your expertise, it's been an education for sure.

Wally Janus
Racine, WI

 

[sag2]

I have a Banks exh. brake & the TC lockup drops out below 1500rpm. I think it's because the line press. is too low then to be effective at the TC?
The line pressure should be fine at that RPM. It would make more sense that they feel the retard torque would not be high enough.

If you don't mind another query; My rebuilt 48RE was done to handle my RV towing needs & has worked fine for a year. Lately I'm seeing some numbers on my Trans Slip display [Banks Automind Tuner w/PDA]. My shop reports not seeing anything RPM related to support that PDA display. The transmission was dropped & stator pump assy checked for leaks, and a new Precision Triple Disc TC was installed as well. Got a clean bill of health.

On interstate few days ago @ 65mph & slowly floored it, backing off @ 115mph. The Trans Slip display showed up to "20" [RPM slip]. An acquaintance said WOT unloads the TC lockup. Sound right to you? Whilst hauling up a grade & I decide to use full throttle [in Tow Haul], will the TC then unlock?
On a 4xRE I do not see how they would calculate the TC slip. You would know only the input RPM (engine RPM) and output shaft speed. Without having a sensor on the input shaft of the transmission (driven by output of TC) they can only calculate the slip if the gear ratio is known. I suppose they could do that, but I'm not sure how with no other speed sensors. Any calculated slip would include the TC as well as the applied element. The TC will generally unlock on WOT with stock programming.

My current setup is calibrated to Lockup above 50mph & dropout below 45mph. Is this reasonable for towing. Should I consider maintaining Lockup <45mph?
As long as you have the torque available for the load you are towing there isn't a good reason I can think of to not be able to set it lower.

 

[Mobius1]

Would anybody be willing to make one of these?

 

[sag2]

Do you mean make one for you, or to make them for sale?

 

[Mobius1]

Do you mean make one for you, or to make them for sale?

To have someone make one for me. That's what I was looking for.

 

[sag2]

Just to update, the micro relays were not up to the task, so I remade it with standard ISO relays. No trouble with the larger relays, just takes up more room under the dash.

 

[SDrake]

Just to update, the micro relays were not up to the task, so I remade it with standard ISO relays. No trouble with the larger relays, just takes up more room under the dash.

I have forgotten what all was discussed earlier on this thread so this may be a repeat. I wonder if it was the relays under sized for the task or if they failed because there needs to be diode woired across the terminals of the switched circuit. This keeps the contacts from arching when the circuit is switched open and they last much longer.

 

[JJPage]

The relays are switching to ground for activation, wouldn't believe breaking a < .5v circuit should arc. My simple lockup circuit still works great, not as sophisticated as sag2's, but effective.

 

[SDrake]

The relays are switching to ground for activation, wouldn't believe breaking a < .5v circuit should arc. My simple lockup circuit still works great, not as sophisticated as sag2's, but effective.

Any circuit that has a coil in it maintains an energy field that has to go some where when the circuit is opened. This energy field builds momentarily a high enough voltage to jump the gap as the contacts are opened. The old ignition systems were built on this principle. Depending on the contact construction they may not last as long as you need them to. The diodes just take care of that tiny spark that most likely in making its way across the gap unless the wiring is such that there is leakage somewhere else as the volltage builds up across the gap.

 

[JJPage]

Install a diode across the relay, see what transpires...or not. This lockup circuit is quite sensitive to any interference, because of my valve body modifications I had to ground both pins 6 & 7 to get my desired affect. I had used two resistors (one for each ground circuit) in parallel, placing the resistors in parallel changed their resistance and the lockup circuit would not function. I had to use two smaller (iirc) resistors to get the correct ground resistance not only to work, but to not throw codes, that's why you hear reluctance in my statement about diodes across the relay, I just do not know...

Sorry to OP, this is a thread about your circuit, not mine Jess

 

[Mobius1]

Any takers on having someone make this for me? I would pay for parts, labor and shipping of course