Shift Torque Factor - A6 G8 GT

[Higgs Boson]

It really just depends on a lot of variables....Do you have a built transmission? Do you have a higher stall torque converter? How much horsepower do you make? etc...

95% of trans tunes are for stock trans/converter in a car with bolt ons. This does not necessitate drastic or complicated trans tuning changes.

Torque management today is far less a simple limiter. Remember, it is not torque limiting, it is torque MANAGEMENT.

You can get your car to run faster if you don't just slam full power into the shift, bark the tires, engage traction control, etc. It will shift faster when you use the torque management system to get the trans to do what you want.

Do not remove all torque management by any means. In a stock or bolt ons application I have had best results simply leaving everything stock (pressures, profiles, TM, etc) and strategically reducing shift times. Where I want it to shift faster, usually not commanding faster than about .25. I can't stand a slow but hard shift.

[cp-the-nerd]

Thanks for your advice and input. I've already reactivated TM, I'll continue refining my tuning strategy based around that.

My trans is bone stock. I'm just looking to get the most out of the factory set up, with maybe some minor bolt-ons in the future. So far with my tune and an intake I'm showing around 215-220 whp with a 7000 rpm redline (completely within factory tested tolerance). This is my daily driver.

The automatic transmission was tuned so poorly from factory, as far as responsiveness and shift points, that I was compelled to buy and learn HPTuners. IMO $500 was a bargain if it meant a great shifting, intuitive transmission. With the shift points mostly perfected, I moved on to performance. It's an uphill battle but I've improved my times by .3-.4 sec and nothing about the tune feels like I'm punishing the car.

[jtrosky]

Here is a link to a great transmission tuning article in case you haven't already seen it...

http://www.g8board.com/forums/showthread.php?t=65550

[Allmachtige]

Woah this thread took off, sorry I wasn't checking up on this lately.

So I think jtrosky is understanding my concern.

As posted in that other thread that was linked, Final TM is calculated like this:

FTF = {Shift Torque Factor + (Shift Torque Factor Adder * Shift Torque Factor Adder Mod)} * Torque Factor Cold

I have a customized Adder Modifier table I use to gradually pull more TM as I get into the throttle more, with all values being negative. So in the lower right cell of Adder Modifier (6000rpm x 295 torque) the value is -0.90039.

Typically my Shift Torque Factors are all set to 1.0000, so if we do the math this is what the formula looks like:

{ 1 + ( 1 * -0.90039 ) } * 1 = 0.09961

At lower rpm and torque cells that FTF value is larger, hence more TM is left in the shift.

Now if I used the value my most recent tuner used we get this:

{ 0.2998 + ( 1 * -0.90039 ) } * 1 = -0.60059

With these most recent changes I get a negative number...you can't have negative TM.

I set all Shift Torque Adders back to 1.0000 because I prefer my variable TM Modifier Adder table configuration.

Again, I believe the dyno tuner just didn't realize I utilize the Adder Modifier table and wanted to get other opinions. Aka: Do you agree?

[Allmachtige]

Another basic question about dyno's: Do they typically stay in TUTD?

I know the pulls are done in 4th with the converter commanded to lock, but I'm going to assume tap shifting into 4th is what's used.

If so that explains some other things I'm seeing.

[realcanuk]

Another basic question about dyno's: Do they typically stay in TUTD?

I know the pulls are done in 4th with the converter commanded to lock, but I'm going to assume tap shifting into 4th is what's used.

If so that explains some other things I'm seeing.

Yes... that is the only way to keep it in 4th.

[realcanuk]

I also use the modifier table to adjust the torque management at various loads and rpms. Keeping in mind I am talking about a high hp boosted car, I have had amazing success by starting with adjusting the torque coefficients. My tranny right now has never shifted better, and I am running for 30 to 100% torque management all over. Fast firm shifts, but not too hard.

That said my tranny (built by myself and a local builder) has lasted 2 seasons at 780rwhp. Now with 1000 it is shifting great, but I doubt it will survive long if I go to the track. Time will tell.

[Allmachtige]

Right, so then which TCC tables are used for full throttle TUTD?

Pattern Normal, A, B, Hot, etc all have Full Throttle TCC tables, but TUTD doesn't. Does it just use the 100 cell in Part Throttle?

I ask because I don't want my single disc locking at full throttle unless its on a dyno, so I copied the Pattern A TCC Part-Throttle tables to the TUTD ones.

Btw I'm currently at 563rwhp, 508tq

[realcanuk]

I wouldn't lock a single disc at full throttle. Might be ok but why even take the chance.

[Allmachtige]

Exactly. I'm trying to keep it from locking in all shift modes, but I thought you have to at the dyno for accurate numbers.

Either way I'd like to know how to keep TUTD from locking at WOT if anyone knows how. I believe have Normal and Pattern A covered.

[realcanuk]

Exactly. I'm trying to keep it from locking in all shift modes, but I thought you have to at the dyno for accurate numbers.

Either way I'd like to know how to keep TUTD from locking at WOT if anyone knows how. I believe have Normal and Pattern A covered.

When I dyno I set all patterns to lock in 4th to be sure but I am pretty sure the TUTD is controlled only by the TUTD tables. the 100% column would control full throttle.

[Allmachtige]

When I dyno I set all patterns to lock in 4th to be sure but I am pretty sure the TUTD is controlled only by the TUTD tables. the 100% column would control full throttle.

So set the TUTD 100 cell to something really low for the dyno? Like 25mph?

Might explain a dip in my dyno chart when it unlocked, because I originally had the last 3 cells set to 255 to keep it from locking on the street.

[realcanuk]

So set the TUTD 100 cell to something really low for the dyno? Like 25mph?

Might explain a dip in my dyno chart when it unlocked, because I originally had the last 3 cells set to 255 to keep it from locking on the street.

Set them to something like 50, and make sure the unlock is lower than the lock speed.

[Bluecat]

From my experience the G8's trans cals won't lock at wot in TUTD mode no matter what you put in the tables. I always have to lock them in the scanner when on the dyno. Vettes and Camaros are not that way, they do what the tables tell them to. Its like the G8's have a switch flipped that we cant see that says "Disable TCC at WOT in TUTD mode" Lol

[04blackgmc]

It will lock in TUTD mode or attempt. If you log the correct stuff you will see it happen.

[jlbjr]

When you guys change the speed control terminate to ?Immediate?, do you leave the torque management stock? Thanks