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

[Eugene Pilipanko]

www.bulkpart.com    part # 74416ak.   Summit racing part # TCI 376600 or 
Jegs part 3 890-37660 should help you out.

---- Original Message ----- 
From: "Milosz Kardasinski" <miloszk at gmail.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, September 11, 2006 5:16 PM
Subject: Re: [Diy_efi] Using GM '747 to control TCC lockup only


> What I have seen in some applications is the use of a vacuum sensor
> connected to ported vacuum. You'd have
> to set the switch point to whatever you feel is the appropriate vacuum
> threshold...but all the sensor does is ground
> out, which engages the TCC below a certain vacuum setting. Some also 
> connect
> a switch in series to turn off TCC
> whenever the brake pedal is depressed.
>
> ----- Original Message -----
>
>>
>> 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".
>
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