[Diy_efi] Using GM '747 to control TCC lockup only

[Don Sauman]

The guy who does my transmissions believes that TC lockup causes more 
problems than it is worth. He reckons that at certain loads/speed you 
can get a drivetrain chatter that will quickly destroy splines/bearings 
etc. He suggests that when I put the 4L80E in my Jeep that I disable the 
lockup.

Thoughts anyone.

Don


Rick McLeod wrote:

>It actually is rather painless, (punn) Painless makes a kit:
> 
>snip<
>700R/4 TRANSMISSION TORQUE CONVERTER LOCK-UP KIT
>#60109 - Now you can control the lockup converter on your overdrive transmission with your carbureted engine and not have to buy an expensive computer! With our easy to install Lock-Up Kit you don?t need the computer or speed sensor. A vacuum controlled 4th gear pressure switch/lock up solenoid combination controls the lockup. Comes with everything to complete the job including a pan gasket. Fits any 700R4 GM transmission. 
>  
>
>>end-snip
>>    
>>
> 
>or you can fab your own, search the archives for diagrams, I've seen them before
>
>
>
>----- Original Message ----
>From: David M. Ingebretsen <dingebre at 3dphysics.net>
>To: diy_efi at diy-efi.org
>Sent: Sunday, September 10, 2006 10:59:10 PM
>Subject: [Diy_efi] Using GM '747 to control TCC lockup only
>
>
>I converted a Jeep 4.2 liter to a GM throttle body, works well. But, I'm
>thinking of purchasing a MOPAR MPI conversion which was designed for that
>engine.
>
>My dilemma is that I have a 700R4 automatic in the thing and like that the
>GM ECU ('747) controls the TCC lockup. I will lose that feature in the Mopar
>unit.
>
>Any ideas about the feasibility of using the '747 to just control the TCC
>lockup? 
>
>I think I can piggy back off most of the sensors the TCC logic uses; temp,
>speed, MAP, but I'm not sure about the throttle position. I saw a cable
>throttle position sensor which might work.
>
>What happens when the ECU isn't actually controlling the fuel anymore and
>the closed loop logic gets feedback, but isn't controlling the system?
>
>Is there a better way to automatically control the TCC and disable the other
>processing in the GM ECU?
>
>I just hate going to a switch on the dash. It's so "unelegant".
>_______________________________________
>
>David M. Ingebretsen, M.S., M.E.
>Collision Forensics & Engineering, Inc.
>2469 East Fort Union Boulevard, Ste 114
>Salt Lake City, UT 84121
>
>801 733-5458
>dingebre at 3dphysics.net
>
>
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>  
>

-- 
Don Sauman
Cythera Communication
35 Asteroid Way
Carlisle 6101
Western Australia

P: 08 9361 0337
F: 08 9361 0581
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