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| PeteK | Auto trans tip for sunday- lock -up | ||
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Lock up torque converters are a great thing.
They allow for better gas milage, sometimes 3 or 4 mpg They allow rpms to drop 2-300 rpm Temps in the trans drop like a stone. The ecm looks for a few things, then it commands lock up. The pressure switches in the valve body look for the pressures required and normally complete the circuit. This allows for the lock up solenoid to activate, opening a mechanical valve in the pump. This valve permits fluid to the converter to lock up the large plate inside. It then allows for the converter to go 1:1. Zero slippage internally allows for the good things I listed at the top of this page. Failures in the lock up circuit should be corrected asap. Repairs are typically very inexpensive. To test for proper lock up function, cruise down the hiway at approx 55 mph. While maintaining steady pressure on the accellerator, use your left foot and squeeze the brake enought to light the brake lights. You will hear the rpm climb approx 2-300rpm. When you release the brake, rpm will drop again. I usually do this 2 or 3 times to hear it work and continue down the road. Not a bad idea to check it once a month or so. Quick, easy, free, and no grease under the fingernails |
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Posted on: 2006/9/3 14:19
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| red_johnny | RE:Auto trans tip for sunday- lock -up | ||
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Good info
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Posted on: 2006/9/3 19:50
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| freakd | RE:Auto trans tip for sunday- lock -up | ||
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Posted on: 2006/9/3 21:25
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| TommyT-Bone | RE:Auto trans tip for sunday- lock -up | ||
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Chair-man of the bored
 
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Hhmmmm.
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Posted on: 2010/7/5 17:02
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| Tre57 | Re: Auto trans tip for sunday- lock -up | ||
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Nice tip..... thanks!
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Posted on: 2010/7/5 17:51
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93 AT Coupe |
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| PeteK | Re: Auto trans tip for sunday- lock -up | ||
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Wow. That tech tip was a blast from the past. Hard to believe it was 4 years ago.
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Posted on: 2010/7/5 18:01
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"It was really on a pass until it came apart." "Yeah. They always are." |
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| bogus | Re: Auto trans tip for sunday- lock -up | ||
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no kidding.
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Posted on: 2010/7/5 18:52
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Trae1976 | Re: Auto trans tip for sunday- lock -up | ||
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2012 Memorial Day Car Show Winner!
 
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Great info Pete!
But I have a question. How does it work when there is no ECM to tell it when to lock up, as in mine? It has constant voltage until the brake switch opens the circuit (I think). |
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Posted on: 2010/7/5 19:09
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| PeteK | Re: Auto trans tip for sunday- lock -up | ||
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Quote:
Lots of ways to do it in the aftermarket. Something must control it. The brake pedal can unlock it, but something has to trigger the ground, assuming the positive side of the solenoid is wired hot (as they usually are). Simplest was is 4th only lock up. A 12 volt ignition lead is run to terminal A (lock up solenoid). Then, a normally open pressure swith is installed into the 4th gear pressure port, and run to the ground side of the solenoid. |
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Posted on: 2010/7/5 19:13
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"It was really on a pass until it came apart." "Yeah. They always are." |
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| Trae1976 | Re: Auto trans tip for sunday- lock -up | ||
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2012 Memorial Day Car Show Winner!
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Quote:
PeteK wrote: Sounds like that's what I have - been wondering how exactly it works. Thanks again!  |
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Posted on: 2010/7/5 19:28
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| CentralCoaster | Re: Auto trans tip for sunday- lock -up | ||
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On my truck, I used a GM vacuum switch, I forget the exact application, but it unlocks the converter during high vacuum (coast) and during low vacuum (heavy throttle) but allows it to lock in between. Then of course run it through your brake pedal switch.
Works like a charm. |
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Posted on: 2010/7/6 6:32
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| patgizz | Re: Auto trans tip for sunday- lock -up | ||
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Quote:
believe your switch is from a diesel truck. |
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Posted on: 2010/7/6 14:45
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| CentralCoaster | Re: Auto trans tip for sunday- lock -up | ||
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Not sure what cars came with it, but I found my old post. IMO this is the perfect setup for lockup control on a carb'd vehicle or anything not using computer control. I did a lot of research on this subject and ran across plenty of horror stories from other "solutions", so it was nice to get it right on the 1st try.
It's actually just a switch that opens on low vacuum. Hooking it up to ported vac is the 2nd part of the puzzle, as it has low vacuum at idle and at heavy throttle. You want the converter to unlock in both scenarios. I'd like to hear Pete K's input on this. Quote:
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Posted on: 2010/7/6 23:54
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| corvetteronw | Re: Auto trans tip for sunday- lock -up | ||
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It works! I tried it on my 91 on the way home from work just now.
 Thanks Pete! |
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Posted on: 2010/7/8 4:23
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A VETERAN IS SOMEONE WHO AT ONE POINT WROTE A BLANK CHECK MADE PAYABLE TO THE UNITED STATES OF AMERICA FOR AN AMOUNT OF UP TO AND INCLUDING THEIR LIFE. |
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