G8 TCC lockup PWM ???

[ProTools4]

G8 Maggie + Vig high stall.

At light throttle the TCC actually surges in and out of slip.
If the TCC is forced ON with the VCM suite and it goes away.
Were can I find the TCC PWM and pressure tables and parameters?

[ProTools4]

anyone?

[BSmith]

There's a thread in the GenIV section on the A6 trans. Why it's in that section and not here, I have no idea.

[12secSS]

Tad,

Under the Trans table, in the TCC tab, there should be two tables/buttons (on the left): TCC Min Duty Cycle and TCC Max Duty Cycle

With the Vig converter, you need to set the Max to 100 DC and the Min to 99 DC. The stock TCC lining GM designed is exclusive designed for pulse modulation engagement, and all aftermarket converters utilizing a billet cover typically use a Kevlar or Carbon lining for the TCC. They can't handle PWM engagement, so it needs to be disabled.

[ProTools4]

George,

Thanks for the reply

I looked and and looked b4 posting
There is no TCC DC table sin the TCC tab.

when the VCM Scanner forces lockup it would be safe to assume it commands 100 DC..

When the G8 is driven at low TP the TCC comes in and out of lockup.
as if it just needs 10% more to get over the load.
But I want that 100%!!!

I'll load 2.22 back on and see if the option shows up.

[BoostedGTA]

I dont see those tables either, did anyone figure this out?

[12secSS]

Send me the file and I will take care of it.

[BoostedGTA]

Send me the file and I will take care of it.

I'm running version 2.22, and this is what the tables look like. Am i missing something?

[g8_795]

I am also having the same problem with my Circle-D in my G8. Any resolution to this?

[BoostedGTA]

I am also having the same problem with my Circle-D in my G8. Any resolution to this?

wish someone would answer this... where are the PWM tables for TCC??

[johnbeahm]

Goto Transmission -->TCC --> Auto TCC --> TCC Duty Cycle -->

Maximum = All values in table must be set to 100
Minimum = All values set to 99

If you take notice to the legends it says TCC Max or Min vs. Line Pressure vs. Trans Temp.

The X axis is the line pressure which maxes out at 96 and the trans temp is on the Y axis which leaves the dc values in the table.

hope this helps

[Russ K]

The TCC duty cycle tables are not supported for the 6L80/90E trans at this time.

Russ Kemp

[Tunning @ LMR]

What do we do on a car/trk with aftermarket torque converter??? I have a 07 Sierra Denali that has a burned up converter, and don't want to burn up the new. I guess I will just disable the lock up function all together.

[BoostedGTA]

So I just want to know if anyone with an aftermarket, higher stall converter in their 6L80 is having success? I'll be doing some more data logging tomorrow, but the G8 is not happy right now. Will be posting logs after I get them tomorrow... What are all the C6 A6 guys doing??

[slow67]

What about doing what they do on 4L60Es, come up with a PWM eliminator in the tranny?

[G8-4-speed]

Ok, since I haven't seen this addressed. The a6 uses mph/tps for clutch application. Now with a stall converter you are adding TPS% to maintain low speeds with converter unlocked causing a large jump in tps on lockup. How about going in TCC apply/release and adjust the MPH range and either spreading the MPH apart further between apply and release OR lowering the release MPH and extending the base MPH(35-lower to 32) up to 44 or 55% TPS??? Anyone try something like this yet?

[slow67]

Ok, since I haven't seen this addressed. The a6 uses mph/tps for clutch application. Now with a stall converter you are adding TPS% to maintain low speeds with converter unlocked causing a large jump in tps on lockup. How about going in TCC apply/release and adjust the MPH range and either spreading the MPH apart further between apply and release OR lowering the release MPH and extending the base MPH(35-lower to 32) up to 44 or 55% TPS??? Anyone try something like this yet?

That's not the issue. With aftermarket converters, generally you don't want them to slip at all (PWM solenoid) because they will chatter. Basically when they want lockup it needs to be instant, not a slow lockup.

[pmj341]

so is there no way to fix this??
My A6 with Yank 3600 converter does not lock up, that's 300 rpm diff, I can lock it manually with the VCM controls and lower the Trans temps by 15-20 degrees
It sure would be nice to be able to lock the converter while in cruise above 60 mph!!!
thanks

[BoostedGTA]

Wish we could get some support on this...

[midevil1]

This issue is the only thing keeping the A6 from being the "perfect" tranny. Alot of converters will "die in vane" until this is supported. Flashing thru a shift SUCKS!!!

IF YOU HAVE A AFTERMARKET STALL AND WANT IT TO LAST." ENABLE THE SHIFTLOCK." Bandaid until we can disable PWM or change duty cycle %.