VY 4l60e TCC unlocking during decel

[calais5l]

I've started doing some basic driveability tuning on my VY N/A Ecotec using OSE flash tool and the factory VY $060A XDF, which works well.

I'm optimising the auto trans tune and TCC lock speeds in 3rd and 4th gear, however, it appears the TCC unlocks during decel. This makes DFCO almost useless, as the revs fall below the threshold at any reasonable road speed.

I've had a look through the enhanced OS version XDF's but couldn't find an option to change this either. Is there any way to have the TCC stay locked at 0% TPS?

[immortality]

There should be a few different option flags for TCC control but they probably aren't defined.

I believe there should be also one that allows the TCC to remain locked when down shifting.

On our old VS I had both those options set (TCC on during decel and down shift) and it makes for a better drive IMHO, you just need to adjust your driving style a bit, more like driving a manual.

[calais5l]

The XDF I'm using (VY V6_$060A v2.63) doesn't have any option flags for TCC, however, after looking at enhanced version (VX VY_V6_$060A_Enhanced_v2.09a), it has a heap of 'Enable TCC Conditions' flags, but I'm not sure what each one refers to.

Does anyone know if there is a list of what these abbreviated labels refer to?

I totally agree that having the TCC remain locked during decel is so important for driveability. I don't know why they make it unlock and lock again as you get on and off the throttle in the factory tunes.

[immortality]

It looks like someone has started to work on defining those option flags but it's not been completed.

[antus]

I compared to another tool and put some names on these functions. Hope it helps. @the1 I moved the version from 'a' to 'b' and added beta incase there is a real 2.09b out there, feel free to remove the beta and put it in the official archive.

[immortality]

Thanks Antus.

[calais5l]

Thanks so much, Antus!

I've already tested it by deselecting TCC 'Decel disable' and 'Low TPS disable' and can confirm it works perfectly. The driveability is so much better like that, with a fuel saving bonus at the same time.

[antus]

Great! Thanks for letting us know.

[rjdrew1986]

Does anyone know if TCC 'Decel disable' and 'Low TPS disable' options are available in other PCMs such as the P04?