[ARCTIC]

I've played with the launch control a bit in my new-to-me 2017 SS convertible A8. Is that the best/fastest way to get it going from a standstill?? It's fun to play with but it maybe seems a little lazy almost like there's a pause when I lift from the brake. Is this the car keeping me from roasting the tires or have you guys noticed that it's maybe not as quick? When I drag race snowmobiles I NEVER want to have the brake grabbing on the caliper at the starting line. I'm sure this is a whole different game.

[cmitchell17]

Everyone will say you are faster without it especially at the track. I don't agree with that but I haven't been able to test my car out at the track yet. On the street the consistency of launch control seems to vary, but I don't have data to back that up.

I find it extremely hard to believe that anyone could do better than launch control, unless there tune is modified from stock and throwing off the torque control. Unless GM just threw launch control in there as a way to keep people from crashing or suing people, I actually believe they somewhat optimized it for its intended purpose.

[laynlo15]

Better the street then at the track

[6spdhyperblue]

On stock rubber and a m6 I feel like the rpm is always way too high, spinning the wheels way too much, and LC needs to control that reactively. If the rpms were 2800 ish it would keep the spin much more under control. I feel the 3500 is more for drag radials.

I’ll try LC on drag radials to see if it works better with them

[TEEZYSS]

Originally Posted by ARCTIC

I've played with the launch control a bit in my new-to-me 2017 SS convertible A8. Is that the best/fastest way to get it going from a standstill?? It's fun to play with but it maybe seems a little lazy almost like there's a pause when I lift from the brake. Is this the car keeping me from roasting the tires or have you guys noticed that it's maybe not as quick? When I drag race snowmobiles I NEVER want to have the brake grabbing on the caliper at the starting line. I'm sure this is a whole different game.

LC is consistent and consistently slower then when its off.


Having tested both on both my A8 SS's on the same road I can tell you that on my cars on that day with LC on the cars would consistently do 4.5-4.6 and turned off I could get 4.2-4.3

One of the last times I was at the track a kid was running 12.6-12.7@112-113 consistently. After I made a pass he came over and started talking to me about launching. I told him not to run LC and feel out the track. First pass he went 12.38@115 and followed with 12.4's@114-115

It takes a little skill and feeling out the track. When I was running in stock form I would bring the rev's up to 1500-2000 rpm. On the 3rd yellow I would crack the pedal 1/2 shifting all the weight to the back of the car then I would roll hard into the pedal till it was floored.

[ARCTIC]

Is it possible that it is intended for street launches because it has an expected amount of grip with the stock tires on an unprepared surface??

[TEEZYSS]

Originally Posted by ARCTIC

Is it possible that it is intended for street launches because it has an expected amount of grip with the stock tires on an unprepared surface??

These newer cars are designed so you don't need any skill to drive them with the NANNIES on...

Personally its one of the few things I hate about the car. Everything is tied into everything and there is no master switch to turn it all off. But it makes it a great all around car if your focus isn't all about drag racing which mine is.

Launch Control is intended to give you max acceleration using the computer on board system which hinders power and torque delivery. You are waiting for the ecu to get feedback on what the tires are doing then make corrections to stop the spin then bring power back in to the point of spinning then pull power back out. All the adjusting or recovery is what makes it slower then just using your foot.

[ARCTIC]

Originally Posted by TEEZYSS

These newer cars are designed so you don't need any skill to drive them with the NANNIES on...

Personally its one of the few things I hate about the car. Everything is tied into everything and there is no master switch to turn it all off. But it makes it a great all around car if your focus isn't all about drag racing which mine is.

Launch Control is intended to give you max acceleration using the computer on board system which hinders power and torque delivery. You are waiting for the ecu to get feedback on what the tires are doing then make corrections to stop the spin then bring power back in to the point of spinning then pull power back out. All the adjusting or recovery is what makes it slower then just using your foot.

So are you racing with TC turned off then? I was surprised to discover that there is no "STABILITRAK OFF" setting. If you hold the TC button down in my truck you can get rid of everything

[SPARTAN sui]

Originally Posted by ARCTIC

So are you racing with TC turned off then? I was surprised to discover that there is no "STABILITRAK OFF" setting. If you hold the TC button down in my truck you can get rid of everything

You can turn off stabiltrak, you press and hold the TC/OFF button until both lights illuminate on the dashboard.

[whiskeyfed]

Originally Posted by SPARTAN sui

You can turn off stabiltrak, you press and hold the TC/OFF button until both lights illuminate on the dashboard.

Yes to this ^

Also, I have noticed that on the street AND on the strip. I have gotten better times WITHOUT using launch control. I still left foot brake but don't build boost. My car, not sure about the SS or the v6, but it will not let me build boost past 2k with the nannies on. However... I have not yet dragged with my nannies off. I am still an amateur. Not ready to snuggle with the wall yet.

[TEEZYSS]

Originally Posted by ARCTIC

So are you racing with TC turned off then? I was surprised to discover that there is no "STABILITRAK OFF" setting. If you hold the TC button down in my truck you can get rid of everything

I race with everything turned off.

[cmitchell17]

I really can't understand how a human could be better than the launch control? Unless you have modifications and tune modifications that have messed up the torque model.

[6spdhyperblue]

Originally Posted by cmitchell17

I really can't understand how a human could be better than the launch control? Unless you have modifications and tune modifications that have messed up the torque model.

Because it can’t know how sticky the surface is. I don’t notice the computer making changes in the two step rpm from run to run day to day

Edit: I don’t notice it compensating for weather

[init4fun]

When my car was stock on the factory run flats I did several back to back 0-60 runs on the same stretch of dead flat asphalt road. Every run I was faster without launch control.

Best run with launch control was 4.5. Best without was 4.2.

Haven't tried it since putting the drag radials on but I'm guessing that the computer wouldn't know what to do with the extra traction. That gives me a good reason to get out and give it a try today.