TC lockup questions
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Joined: Sep 2000
Posts: 235
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From: Sarasota, FL
TC lockup questions
I don't want to lug my new engine and the 700R4 was always very slow to downshift. To help this, I've cut down the TPS% enable for TC unlock tables, especially at low speed. Am I doing the right thing? Am I going to hurt the TC? Should I fiddle with the lockup tables?
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Joined: Jul 1999
Posts: 317
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From: Chandler, TX
Car: Used to be an '87 IROC
Engine: 5.7l TPI
Transmission: 700R4
Axle/Gears: 3:23?
I have done some work in this area myself. Here are my suggestions:
1) Start with an '88 bin. The TPS settings in there are much better than for the '87. Don't mess with the TPS stuff.
2) Change the lock and unlock speeds. I have mine set to lock at 51mph and unlock at 49mph (lower gears and fourth gear). This way, the converter never locks in lower gears (1-3), and locks at a higher-than-stock speed in fourth.
This change alone was worth the purchase of the TunerCat software!
------------------
'87 IROC 5.7l TPI - original owner!
1) Start with an '88 bin. The TPS settings in there are much better than for the '87. Don't mess with the TPS stuff.
2) Change the lock and unlock speeds. I have mine set to lock at 51mph and unlock at 49mph (lower gears and fourth gear). This way, the converter never locks in lower gears (1-3), and locks at a higher-than-stock speed in fourth.
This change alone was worth the purchase of the TunerCat software!
------------------
'87 IROC 5.7l TPI - original owner!
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