got a ?,maybe it belongs in the ecm box,anyways ill try,rebuilt my trans,guy undid the lock up feature,said i dont want it for my horsepower and use,but car still computer controlled,will not having the convertor plugged in trip a light or fool the ecm or is the convertor just an output signal

 

It may trip a trouble code, but it won't hurt anything. The ECM send a signal to lock and unlock the converter. It may be able to "tell" that nothing is happening from this signal, but that's it. A custom chip can solve the check engine light problem.

Also, if running a non-lockup converter you need a non-lockup valve in the pump.

 

So, if my tranny was also installed with a NON-locking converter, what do i have to do to tell the ECM to quit trying to lock it up? Very annoying watching the RPMs jump around at 45mph because the ecm is still trying to lockup the converter.

 

Get a chip burned that will stop trying to lock the converter.

 

i believe u have to take the o-ring off the input shaft too

 

Ok - i've talked to a guy that supposedly does custom chips, and he said the computer shouldn't care. Well, if it's not the ECM, what DOES tell the converter to lock/unlock? Something is causing the rpms to jump up/down between 40-50mph. I've done some searching on these pages, but didn't find anything specifically related to what tells the converter to lock on a non-VSS car.

 

What engine does the car have? Because if it's got TPI then it has a VSS. It might not be in the trans, but it has one. Early cars had a VSS piggybacked into the speedometer. The ECM got it's signal from that VSS.

The computer does tell the converter to lock and unlock in the stock configuration.

If you have a non-lockup converter installed then the RPM jumping issue isn't realted to the converter. THe ECM can send a signal, but if the converter can't lock it isn't going to affect RPM.

 

There are TCC lock and unlock constants, and tables in the program, depending on the vehicle. I dont think it would throw a code though. At least I have never had a code come up before. It just might not be able to lock, and unlock at the MPH values in the program, since it will not have the lockup feature anymore. Might not even need a new prom reprogram.

 

How much power are you making? Lockup is the reason alot of people run the 700R4 to begin with.

 

No, this car is an 1987 - all mechanical. No VSS. Speedo cable and all that. Now this is really making me nuts, I thought it was the TQ but I don't know what else would make the rpm jump around like that. No codes being set at all, wonder if it's maybe the TPS?

 

brutal,im running a built 425 stroker,estimated 530-540 hp.plus 150 nos shot/..

 

What are the exact symptoms of the RPM jumping around? Is it only in certain gears, at highway speeds, etc? I think you are going to find that this problem is not trans related.

 

My 436 made 500 hp, and 569 lb ft on the engine dyno, with EFI, and Im using a 700R4. As a matter of fact, I just mailed Edge Racing Converters my M/O for a new 9.5" lockup converter.

I was just wondering, as you said in your first post, that your trans guy said you dont want it. How does he know? Do you want it? or no? Alot of people with serious engines are using a lockup trans, and driving on the street, and getting better mileage with the lockup feature.

Also, you can always have your lockup tailored to your driving habits,(drag race, street,) in the eprom. You can do it yourself, or have someone do it for you.

If you already have a non lockup trans, and you are going to use it, then you can have that changed in the eprom too, as TKO has said. All the tables can be simply zeroed out. You will be basically using a manual trans bin.

BTW, anthony, got any more specs on your engine, (intake, cam, etc.)

 

he said based on his drag racing experience i wouldnt want it,which im kinda pissed at him for doing since he didnt ask me,he just reworked trans to eliminate the lock out.thats also why i havent called or paid him in 2 weeks,but thats another story...