Allow TCC lockup during shift

gojo · 06-20-2004, 10:14 PM

What is the difference in selecting true or false?

0rion · 06-21-2004, 01:10 PM

I asked this same question on LS1Tech a while back and got 1 response I think so I'm guessing no one knows. The one response I did get said he wasn't sure but had been to the track with it set to true and then set to false and saw no difference in the quarter.

gojo · 06-21-2004, 01:58 PM

MY car is a 2003 and came set on false. All the earlier year files I've seen are set on true?

ArmyVette · 06-21-2004, 02:41 PM

This sounds like a darned good question for carputing.com's LS1 Edit forum.

I'd like to know the answer to this question myself. The user's manual doesn't do a very good job at all of describing what these setting changes might (or might not) do for you.

gojo · 06-21-2004, 04:26 PM

This from Chris at Slowcar.
A4 TCC Tab - Allow TCC lock during shift:
This determines whether the TCC can be locked through a shift (if locked before) or if the computer will force disengagement.

I still don't understand.

0rion · 06-22-2004, 01:24 AM

I'm guessing having it unlocked during the shift will just save some wear and tear on the tranny. I set mine to true on my last flash but am gonna return to false on my next flash since I've noticed no gains from it.

Ken@HPTuners · 06-24-2004, 09:31 AM

It does just that.

If set to true, the converter will remain locked during a shift.
GM used this mostly on the heavy duty truck calibrations with the 4l80E.

You have to pay attention to the apply/release MPH vs TPS tables in 4th gear.
If the converted is told to lock @30MPH in third, but not lock until 45MPH in 4th, the conveter will still unlock during the gear change until the 4th gear MPH qualifications are met.

Ken

gojo · 06-24-2004, 11:16 AM

Great! Thanks for the answers.