Tuning A6 Launch Control

[Duke]

When I do the A6 launch control (competition mode, apply brake, quick full throttle), the rpms go to about 1300 and hold. Can this be tuned to a higher rpm?

Also, what is happening here. Is it programmed at 1300 rpm because that is close to the stall of the stock converter? Or are the clutches actually disengaged, and then they engage when the brake is released? If it is the later, then the rpm could be raised to 2000-3000? Probably would grenade the transmission, but there should be some happy medium here.

[cowjazz]

Your RPMs should be around 3300-3500 when using launch control. Duh, you said A6. My bad.

[camaro1]

auto cars dont have launch control,, you are just feeling the stall of the torque converter ,, if you want it higher you need to buy a stall converter

[jsharp]

Going with a precision 2400 vert for my car!! And adding a cam to sig mods should be fun!

[Duke]

Originally Posted by camaro1

auto cars dont have launch control,, you are just feeling the stall of the torque converter ,, if you want it higher you need to buy a stall converter

Uh, wrong.

[Duke]

Actually, I was going to add that while doing the A6 launch control, that I didn't really feel any brake pressure like the car wanted to move. So, I'm inclined to think the clutches are disengaged.

This thread is about tuning, not aftermarket torque converters. It is also not a debate that the A6 has launch cotrol, it does. I posted this question on HP tuners forum and no response there either, not yet anyway.

[Supercharged SS]

Originally Posted by Duke

Actually, I was going to add that while doing the A6 launch control, that I didn't really feel any brake pressure like the car wanted to move. So, I'm inclined to think the clutches are disengaged.

This thread is about tuning, not aftermarket torque converters. It is also not a debate that the A6 has launch cotrol, it does. I posted this question on HP tuners forum and no response there either, not yet anyway.

The A6 has NO launch control. You can put it in "sport" mode but that's about it. Your 1300 rpm's is the limit if the stock converter. The only way to foot brake stall the car to a higher rpm is change converters. No response on the HP site because that option doesn't exist. If it did, I would have saved the money I spent on my TC.

[ArkySS]

Originally Posted by Supercharged SS

The A6 has NO launch control. You can put it in "sport" mode but that's about it. Your 1300 rpm's is the limit if the stock converter. The only way to foot brake stall the car to a higher rpm is change converters. No response on the HP site because that option doesn't exist. If it did, I would have saved the money I spent on my TC.

What he said.....

[xx_ED_xx]

Originally Posted by Duke

Actually, I was going to add that while doing the A6 launch control, that I didn't really feel any brake pressure like the car wanted to move. So, I'm inclined to think the clutches are disengaged.

This thread is about tuning, not aftermarket torque converters. It is also not a debate that the A6 has launch cotrol, it does. I posted this question on HP tuners forum and no response there either, not yet anyway.

If you are in gear the clutches are applied. The convertor is the item in your trans that dictates what rpm it flashes to.

here ya go the interwebz is your friend


http://en.wikipedia.org/wiki/Torque_converter

[DCCCTX]

There is a launch control on the A6, you tap the TC button twice, then put foot on brake and in one motion go to the floor with the gas and the RPM wil stop at 1300 just like a two step module would do with out the stutter.

[Duke]

Thanks DCCCTX. Finally someone who has actually tried it.

There are a few guys in here that don't have a clue about what they are saying.

[Supercharged SS]

Originally Posted by Duke

Thanks DCCCTX. Finally someone who has actually tried it.

There are a few guys in here that don't have a clue about what they are saying.

I just tried what the 1 post guy said and when you tap the button twice all you get is the stabiltrak message saying you r and in competitive mode. Then I brought the r's up to 1300, then 1400, the 1500, then I had a smoke show. So I really don't think there is a launch mode. No need to say people don't have a clue we are just trying to help.

[chopss]

Cowjazz manual launch control holds at 4500 rpm

[Duke]

Try again, this time push the accelarator pedal to the floor in one quick stroke.

[camaro1]

a6 has no launch control,, all you are feeling is the trans stall torque managment, the ecm is just shutting the throttle off to keep the tcm happy with whatever numbers you set in the stall torque mgt table,,, this table needs to be modified along with others when you add a stall converter otherwise even with a 3000+ rpm converter the ecm will keep the throttle only open enough to keep the rpm at these values.

[Supercharged SS]

Originally Posted by Duke

Try again, this time push the accelarator pedal to the floor in one quick stroke.

I will when I have the car in an open area. Mashing the gas is a bad idea with 660 rwhp and 25 degrees outside. But I will try it if I take the car out tomorrow. My interest has been peaked. If I do try I'll post it either way.

[Duke]

Maybe launch control is misleading, ok, stall torque management. Hey, then it can be adjusted, in HP tuners anyway.

[camaro1]

it is only torque mgt it can be set up higher but your stall converter determines your stall speed, it is just a safety measure in the ecm/tcm for the stock converter torque mgt,, it isnt launch control

[Duke]

Originally Posted by Supercharged SS

I'm curious if you can crank it up to the desired stall speed like you mentioned (2-3k). You should let us know after you adjust it.

I would think that a car like yours could really benefit as far as launch consistency if this can be done. Very impressive machine you have there.

I have to talk to the tuner that will mod my car. He uses EFI live.

[Supercharged SS]

Originally Posted by Duke

I would think that a car like yours could really benefit as far as launch consistency if this can be done. Very impressive machine you have there.

I have to talk to the tuner that will mod my car. He uses EFI live.

I can have my car leave 10 times and the 60' will fluctuate no more than .2 in either direction. I.E., last March, it did 6 1.60 60's in a row. Thats consistent enough for me. All those tables do is confuse me. I have no idea what adjust that would do. That's why I take it to a professional. All I was certain of was that there is no "launch control",( where the car would hold a certain rpm) on the A6.

[Duke]

Originally Posted by camaro1

it is only torque mgt it can be set up higher but your stall converter determines your stall speed, it is just a safety measure in the ecm/tcm for the stock converter torque mgt,, it isnt launch control

That's the way I am leaning, that it is limited by the converter, but it still acts like launch control.

When I do it, I'm at the line with brake on, engine at 1300 rpm and the throttle on the floor. Then all I have to do is dump the brake.

[Supercharged SS]

Originally Posted by Duke

That's the way I am leaning, that it is limited by the converter, but it still acts like launch control.

When I do it, I'm at the line with brake on, engine at 1300 rpm and the throttle on the floor. Then all I have to do is dump the brake.

All you are doing is foot brake stalling your car to 1300 rpm's. If you car made more power you wouldn't be able to hold it to the floor. I'm suprised you can right now. With the stock stall my car, with the front tires locked, would push itself down the track at 1400 rpm's. It would leave black marks from the fronts. Without a trans brake that is all the A6 guys can do to leave the line. Unless you wack if off idle.

[Duke]

Believe me it works.

[jimmyj333]

Originally Posted by Duke

Believe me it works.

yes it does work!! Holds at 1300 with no push.

Almost feels like pulling timing or shutting down fuel.

I am interested in knowing if this can be tuned for higher launches also.

[Entaille]

curious if that is beneficial towards your 60' or not? what kind of times are you putting down using the stall at 1300rpm?