TCC Lockup While Coasting

[RonC]

Is there anyway to make the TCC stay locked when you let all the way off the throttle and resume crusing as in slower driving on hilly or curvy roads. It is annoying to have it unlocking and locking all the time and I want to keep it locked. I have not found anything in the program that will do it and have searched for info on this but found nothing. Anyone know how to do this or is it even possible?

Ron

[joecar]

Increase the MPH difference between these two tables (in each gear separately):
TCC->Apply->TCC Apply Speeds (D1001, D1002, D1003)
TCC->Release->TCC Release Speeds (D1004, D1005, D1006)

Make the release speed say 5 MPH lower than the apply speed for the same gear.

And keep these tables at 100% for each gear:
TCC->Release->TCC Throttle Release (D1007, D1008, D1009)

[RonC]

D1007-8-9 are all 100%. D1003 is 34 mph and D1006 is 22 mph. D1002 is 26 mph and D1005 is 21 mph. Is this what you meant? This works fine to keep the TCC locked as long as I have light throttle applied but if I let off completely it unlocks and when I resume it relocks. I believe this is normal, I just want it to stay locked. Am I missing something else?

[joecar]

Hmmm... my F-body stays locked during coasting until the MPH drops below the curve or the brakes are applied...

It could well be otherwise for different OS's or even for the 4L80E...

What model/year vehicle do you have...?

[RonC]

I'm sorry, it's a 2005 Silverado 1500 HD 6.0L 4L80E, OS 5120003c . My 2000 w/4l60E does the same thing. Do you or anyone else know what makes the F body lockup and why mine don't?

[joecar]

I'm sorry, it's a 2005 Silverado 1500 HD 6.0L 4L80E, OS 5120003c . My 2000 w/4l60E does the same thing. Do you or anyone else know what makes the F body lockup and why mine don't?

I suspect there may be another set of parameters/tables, as of yet undiscovered.

[RonC]

Thanks joecar.

Is there any chance they might be discovered Ross?

[ChipsByAl]

While on the TCC subject, can the TCC WOT enable/disable parameters be added. Some vehicles have the converter upgraded and can handle the apply under these conditions. Some need it turned off.
Thanks,
AL

[RonC]

Mine will lockup under WOT when programed to. I discovered it by accident when playing with 2nd gear tcc tables.

[dc_justin]

I suspect there may be another set of parameters/tables, as of yet undiscovered.

I suspect that there are a number of TCC tables/parameters that are floating around in the PCM unbeknownst to us... This one, minimum ECT threshold for lockup, etc...