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

[Frank McCracken]

Several years ago I had 700 with a lock-up. I just a power lead to the green
wire on the trans plug. I did have switched power for a while until I
discovered that somehow the thing unlocked by itself when nessesary.


----- Original Message ----- 
From: "David M. Ingebretsen" <dingebre at 3dphysics.net>
To: <diy_efi at diy-efi.org>
Sent: Sunday, September 10, 2006 8:59 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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