How does launch control work?

[Barritia]

Ok so I just been playing around today with the car. At full throttle launch I spin the tires like crazy no matter the road conditions. Is there anyway to not launch at full throttle? I'm getting the trans tune this week and John said he could help out with launch rpm on the tune but is it possible to feather the throttle your self and get the same affect. The car just bogs when I try it. Is that causing any damage to the trans or engine?

[DoughBoyFreshLV]

Ok so I just been playing around today with the car. At full throttle launch I spin the tires like crazy no matter the road conditions. Is there anyway to not launch at full throttle? I'm getting the trans tune this week and John said he could help out with launch rpm on the tune but is it possible to feather the throttle your self and get the same affect. The car just bogs when I try it. Is that causing any damage to the trans or engine?

You're spinning tires in a awd car? I would think maybe a tire slip then it would grab... yes to the engine and trans, you don't want you keep beating the car back to back to back, I know in the gtr it only allows like 3 launches in a row before it shuts off lc.

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[MadAboutCars]

Ok so I just been playing around today with the car. At full throttle launch I spin the tires like crazy no matter the road conditions. Is there anyway to not launch at full throttle? I'm getting the trans tune this week and John said he could help out with launch rpm on the tune but is it possible to feather the throttle your self and get the same affect. The car just bogs when I try it. Is that causing any damage to the trans or engine?

The stock Pirelli tires are quite hard, which doesn't help. APR's TCU tune has a cool system where they have 3 LC rpm settings based on throttle position, but unfortunately no flash at home.

[Barritia]

I have pilot super sports and still can't get grip. I'm more concerned about the Boging down where the car feels like it's burning up the clutches when trying to do a lower RPM launch. It seems the clutches do not rub at all when at the highest launch RPM.

[DGVR6]

Are you tuned?
As in just an ECU tune?

[cohall]

You're spinning tires in a awd car? I would think maybe a tire slip then it would grab...

I tried LC for the first time over the weekend. I left a solid 15-20 foot "skid mark" each time from spinning tires for quite awhile before they cleanly grabbed. Granted, I'm on all-seasons and tuned, which didn't help. But it's certainly possible to have a significant amount of 4-wheel spin in these cars.

[Barritia]

Yeah stage 1+ but waiting for the TCU to come end of this week. Hoping that will help a bit. John already said to give him a shout if I want ups like a lower RPM launch map for the TCU if I'm still having trouble after that.

[DGVR6]

With a tune you're going to have problems with traction.
Even on stock ecu tune I break traction and short shift.

Lower launch limit should help, I'd say 3.5 rpm would be optimal

[Barritia]

I'm betting that will help a lot.

[MVR 155]

You can launch early, this will require you to let off the brake before the RPM reaches max level. This may help with reducing wheel spin. With a heavy car like this, a bit of wheelspin may help providing you are not short shifting out of first due to it.

[Ze_Nardo6]

Given this thread is regarding launch control, isn't there some truth to a max of 200 launches or so before the car goes into some form of permanent limp mode?

[cohall]

Given this thread is regarding launch control, isn't there some truth to a max of 200 launches or so before the car goes into some form of permanent limp mode?

You're sort of correct. Yes, there is a limit of 200 Launch Control launches, which is tracked by the cars computer. Some of the TCU tunes (I know APR does, at least) over-ride the counter and set it at a higher number (500). However, if you reach the maximum number of launches allowed, the car does NOT go into a permanent limp mode like you suggest. It simply doesn't allow any more Launch Controlled starts. The car operates normally in every other way.

[Chris@EPL]

Our TCU eliminates the 200 launch maximum.

[Ze_Nardo6]

You're sort of correct. Yes, there is a limit of 200 Launch Control launches, which is tracked by the cars computer. Some of the TCU tunes (I know APR does, at least) over-ride the counter and set it at a higher number (500). However, if you reach the maximum number of launches allowed, the car does NOT go into a permanent limp mode like you suggest. It simply doesn't allow any more Launch Controlled starts. The car operates normally in every other way.

Interesting. I've read in other threads that cars with tunes claimed to drive with stock-like power if they hit that max threshold..

- - - Updated - - -

Our TCU eliminates the 200 launch maximum.

Problem solved.

[DGVR6]

Interesting. I've read in other threads that cars with tunes claimed to drive with stock-like power if they hit that max threshold..

I believe that's the RS7 ZF tranny, not our DSG. We're good ! That is until a clutch burns out lol

[cohall]

Interesting. I've read in other threads that cars with tunes claimed to drive with stock-like power if they hit that max threshold..

You're conflating two different issues. I'm assuming you're referring to the issue of the RS7 tranny not going into VMAX mode. That seems to be an issue with overall power/torque being too great - and is not related to the total number of launches done.

As DGVR6 says, that's not a problem for the regular S cars. The launch control limiter is exactly as it sounds. Once you reach the limit, not more using launch control - unless you get a TCU tune...

[Ze_Nardo6]

You're conflating two different issues. I'm assuming you're referring to the issue of the RS7 tranny not going into VMAX mode. That seems to be an issue with overall power/torque being too great - and is not related to the total number of launches done.

As DGVR6 says, that's not a problem for the regular S cars. The launch control limiter is exactly as it sounds. Once you reach the limit, not more using launch control - unless you get a TCU tune...

Good to know. Thanks.