My Car will not go into launch mode

[Janticoli]

2018 S6/ 29k miles

This is my second one in the past year as my first 2018 was hit and totaled. Only prefacing that because i followed the steps accordingly on my last one and was able to launch it no problem... this one i can't get it to work! ESC off, dynamic mode on... left foot smashed on the pedal and then push down on the accelerator..... the rpm's never rev up and it just feels like i am power braking..


any help? am i missing something?

[brad281]

Check your launch counter. Factory limit is 200. If the prior owner launched 200 times, you'll have to get a tcu tune to remove the limit.

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[widebodyfx]

Checking the launch count is a good idea. ESC needs to be held down until it says braking guard off (not just tapping it to turn off traction control), car needs to be up to temp and steering wheel should be straight.

[brad281]

Checking the launch count is a good idea. ESC needs to be held down until it says braking guard off (not just tapping it to turn off traction control), car needs to be up to temp and steering wheel should be straight.

Is the C7.5 different from the C7? My C7's ESC only has one setting.

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[widebodyfx]

Is the C7.5 different from the C7? My C7's ESC only has one setting.

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I don’t know if there’s a difference, have always done or read of holding down the traction control until the DIS says braking guard off. If it works for you without the long hold that is enough for me.

Steps I recall as to how to use LC.
Car up to temps
Steering wheel straight
Drive select in dynamic ?
Trans in Sport
ESC off (item I guess in question is long hold or quick tap)
Brake pedal all the way down
Mash the accelerator pedal

[brad281]

I don’t know if there’s a difference, have always done or read of holding down the traction control until the DIS says braking guard off. If it works for you without the long hold that is enough for me.

Steps I recall as to how to use LC.
Car up to temps
Steering wheel straight
Drive select in dynamic ?
Trans in Sport
ESC off (item I guess in question is long hold or quick tap)
Brake pedal all the way down
Mash the accelerator pedal

Drive select can be in whatever as long as the Trans is in Dynamic. For the B8 and other platforms with DSG you have to do the long press of the ESC, but not on the C7 dsg cars. Just push it once and release. Not sure about the C7.5.

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[ericw.]

I don’t know if there’s a difference, have always done or read of holding down the traction control until the DIS says braking guard off. If it works for you without the long hold that is enough for me.

Steps I recall as to how to use LC.
Car up to temps
Steering wheel straight
Drive select in dynamic ?
Trans in Sport
ESC off (item I guess in question is long hold or quick tap)
Brake pedal all the way down
Mash the accelerator pedal

There's no long-hold on ESC for the S6/S7 dual clutch.

[Nosferatu]

Checking the launch count is a good idea. ESC needs to be held down until it says braking guard off (not just tapping it to turn off traction control), car needs to be up to temp and steering wheel should be straight.

That part of ESC is not necessary.

<<-- 2018 RS7 Performance. ESC Sport (1 single click), hold brake down hard, floor it, release brake. Brake has to be FIRMLY pressed down and like others said make sure the car is warmed up. It'll do the aggressive AMAX shifting then until the 200th time like others stated.

[Faceman76]

Was the oil up to temp?

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[hozda]

On my 18 S6 I had to blip the throttle a few times before it would rev up to 5k


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[widebodyfx]

Got it, I did LC only a handful of times in my 2016 S6. At the track, upsweep launch worked out better at least on stage 3.

[brad281]

Got it, I did LC only a handful of times in my 2016 S6. At the track, upsweep launch worked out better at least on stage 3.

I agree on the upswing. I lowered my launch rpm to 3k to avoid wheel hop

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[Janticoli]

Thanks for all the replies... I will get to a scanner to check my launch counter.

Just to clarify though... does it matter if i move the gear selector over to manual?

[brad281]

Thanks for all the replies... I will get to a scanner to check my launch counter.

Just to clarify though... does it matter if i move the gear selector over to manual?

As long as the transmission is in Dynamic when you move the shifter to manual it will still go into launch control.

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[mrkubanftw]

As long as the transmission is in Dynamic when you move the shifter to manual it will still go into launch control.

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You need 3 things for launch control to work.

Up to temps.
Basic traction control-off. Single press of ESC.
Transmission in Dynamic
Drive select in S-mode. I've had it work far more consistently in S-mode. I have had it NOT work in manual mode. I THINK it uses the drive select mode you were IN and carries it to manual. So being in S mode and going to manual perhaps work fine too?

[sepheroth86]

Got it, I did LC only a handful of times in my 2016 S6. At the track, upsweep launch worked out better at least on stage 3.

What is this upsweep launch you speak of?

[Audisthesia]

NO AMAX on an S6.

[Janticoli]

NO AMAX on an S6.

whats AMAX ?

[Alabama]

whats AMAX ?

From another AZ thread:

Amax uses both clutches simultaneously and slips between the gears.

A normal shift de-rates the engine by telling the ECU to pull timing. It does this to prevent free-revving and to lower the torque at the clutch to make shifting easier. It has the engine de-rate while it's opening the first clutch. The engine free-wheels for 50ms or so while the second one is being closed and then the TCU tells the engine to bring back the power. That de-rate timing retard is what causes the DSG "farts" you can hear on videos.

Amax doesn't work like that. When in this mode, the TCU keeps the beans on the entire time. There is no de-rate at all. It controls the engine RPM by having both clutches engaged in the linear (slip) region together while it transitions between the two. The upshot of this is that there is no de-rate, the engine is making full power the entire time and is transmitting it to the ground even during the shift. The downside is that it's extremely delicate. If the transition time is too fast, the clutches won't slip enough, will be working against each other and will rip themselves out of the transmission. On the other side, if the transition time is too slow, the engine will free rev, hit the limiter and de-rate via the rev limiter. It comes back as soon as the clutch closes a bit more and pulls it off the redline, but it still spent some time in de-rate.

[gk1]

That is an interesting note I thought AMAX was only a ZF thing. At least I notice no difference on my S6 pre and post TCU tune. (Even though AMAX is listed in APR's marketing materials.)

AMAX as I understand it is a stock built in ZF thing and it essentially does what is described, but perhaps put more simply it does not drop the power in-between shifts so it is like powershifting each gear and you can feel the car lurch forward when it happens.
I've done it in the SQ5 and it is definitely different than just flooring it.

[Audisthesia]

That is an interesting note I thought AMAX was only a ZF thing. At least I notice no difference on my S6 pre and post TCU tune. (Even though AMAX is listed in APR's marketing materials.)

AMAX as I understand it is a stock built in ZF thing and it essentially does what is described, but perhaps put more simply it does not drop the power in-between shifts so it is like powershifting each gear and you can feel the car lurch forward when it happens.
I've done it in the SQ5 and it is definitely different than just flooring it.

Everything I've ever read says launch mode for DSG, AMAX for ZF.

[Alabama]

That is an interesting note I thought AMAX was only a ZF thing. At least I notice no difference on my S6 pre and post TCU tune. (Even though AMAX is listed in APR's marketing materials.)

AMAX as I understand it is a stock built in ZF thing and it essentially does what is described, but perhaps put more simply it does not drop the power in-between shifts so it is like powershifting each gear and you can feel the car lurch forward when it happens.
I've done it in the SQ5 and it is definitely different than just flooring it.

The quote is from the 2017 AZ thread titled "What is AMAX?" and attributed to "Sean@APR". In the last post of the thread Chris Morales wrote "Whatever the details, the gist I think is that normally the TCU tells the ECU to pull timing and power between shifts in order to preserve the transmission, but AMAX mode turns that protection off. You power straight through the gears."

[mmurphys7]

What has anyone used to flash the ECU to reset Luanch mode count from the 200 max?

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[MTV10]

Whenever I engage launch control, I always push the brake down far, bring it back a bit then push back down. You'll feel the brake pedal hit a wall and it won't go any further. Launch control always works this way.

[widebodyfx]

That's what brad said.

[Janticoli]

** update ... I tried again the other day and was successfull ... so it appears my car did not exceed the 200 count launch limit... I belive my issue was it wasn't recognizing my foot being all the way down on the brake pedal, I did a slight pump of the pedal first and then mashed it all the way down and it worked.... Thanks all for the input !

[brad281]

** update ... I tried again the other day and was successfull ... so it appears my car did not exceed the 200 count launch limit... I belive my issue was it wasn't recognizing my foot being all the way down on the brake pedal, I did a slight pump of the pedal first and then mashed it all the way down and it worked.... Thanks all for the input !

Great news!! Glad you got it ironed out...and without having to spend any money.

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[Nosferatu]

Yeah both my Audi cars for some reason you REALLY have to press that brake pedal down to enable launch control. My Nissan GT-R just lightly on brake and floor it and boom it's ready to launch. Audi it's put all your weight into that brake pedal or it won't launch.