Pre and post facelift launch control

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Leo-RS
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Re: Pre and post facelift launch control

Post by Leo-RS » Wed Mar 09, 2016 3:05 pm

I guess the term to use is brake torque launch rather than launch control.

Both activate in the same way (ESP off-Dynamic/Sport on, Left foot on brake, right foot flat to floor, left foot off) Launch control will obviously control the launch with electronic intervention, a brake torque launch will have no electronic intervention, you'll be at the mercy of traction and driver input only.

In fairness, other than ability to hold revs for longer, there's very little real life difference between the S-Tronic/DSG and the ZF Tip box for launching. In an S-Tronic/DSG car, a launch that breaks traction will be rudely intervened by a short shift upto the next gear, in the Tiptronic, this is not the case, you'll just slide about in 1st until you hit the change point to 2nd.

I launched my TTRS over 250 times at the drag strip so I'm very well acquainted to Launch Control capabilities and limitations. With the RS6, I must be on around 25 launches off the brake so far. Those worried about a few launches and possibility of damaging the torque converter, nope, chill, I'm the test guinea pig :thumbs:
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IanH755
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Re: Pre and post facelift launch control

Post by IanH755 » Wed Mar 09, 2016 3:54 pm

Until your damaged Tq Converter fails after a few years and the gearbox needs replacing.

When you’re at idle, the torque converter spins slowly in transmission fluid but when you use both the brake and accelerator together, using the Tq Converters Stall Speed as a type of "launch control", you're making it spin quickly without allowing the fluid to transmit power to the wheels and this can damage it (bent stators and damaged rotors). At the very least you’ll overheat and degrade the transmission fluid if you do it repeatedly.

Now doing the odd one or two shouldn't be an issue in the long term but I certainly wouldn't be treating it like the Golf above with 250+ launches.
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