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James W



Member Since: 29 Nov 2009
Location: Wirral
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Launch Control (not low speed one)

I have happened to notice on a couple of YouTube videos such as this one (linked to the correct point in the video)...

Click here

That there seems to be a launch control used where the vehicle holds at 2500rpm then takes off. There's another video showing it on a pre-2017 vehicle. I know about the low speed off-road launch control but is there one for fast starts? I can't find any reference to it in the manual.

I'm not planning on drag racing, it's just intrigued me as I've seen it twice now! Anyone else seen this or know any more info? FFRR SDV8 Autobiography

Post #608936 12th Oct 2021 2:46pm
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AJGalaxy2012



Member Since: 11 Jun 2018
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On some auto's it's foot on the brake and full throttle, releasing the brake launches you. BMW i3 Electric Car
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Post #608939 12th Oct 2021 3:29pm
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stan
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on a 4.4 the second turbo comes in around 2500rpm, maybe thats what you mean... ... - .- -.




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Post #608942 12th Oct 2021 3:43pm
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James W



Member Since: 29 Nov 2009
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Looking at the video his hands don't move, he's is S1 gear (Sports mode first) so I'm guessing it must be the left foot brake, you can hear something release before he shoots off

@Stan - yes that makes some sense but in the video he's not even crawling - then when 'something' is released he shoots off Confused FFRR SDV8 Autobiography

Post #608949 12th Oct 2021 4:40pm
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Martin2



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Are you sure the something he releases isn't just the brake? i.e. He builds revs to 2,500 and then releases the brake? MY23 Panamera E-Hybrid
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Post #608956 12th Oct 2021 5:29pm
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chugga90



Member Since: 24 Jul 2015
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I think I saw a video about the Audi system and launch control has 10 goes and then it’s new gearbox time.
So it’s going to be an expensive hobby for the people doing it on the videos.
However I have nothing constructive to add to the actual question.

Post #608959 12th Oct 2021 6:36pm
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James W



Member Since: 29 Nov 2009
Location: Wirral
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United Kingdom 2017 Range Rover Autobiography SDV8 Siberian Silver

Martin2 wrote:
Are you sure the something he releases isn't just the brake? i.e. He builds revs to 2,500 and then releases the brake?


Having watched it a few limes I'm thinking he must. I would have thought the vehicle wouldn't allow you to rev with the left foot on the brake but I can't see him doing anything else. Even the chapter on the video is entitled "launch control" so it just made me curious.

Anyone willing to try it? Laughing FFRR SDV8 Autobiography

Post #608960 12th Oct 2021 6:43pm
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AJGalaxy2012



Member Since: 11 Jun 2018
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Many Audi automatics and some BMW's I've driven if you have left foot on the brake, disengage drive and allows revs to rise to a predetermined level to allow turbo's to be spooled etc. When the brake is release the gearbox then transmits the drive and youre off. BMW i3 Electric Car
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Post #608971 12th Oct 2021 8:06pm
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James W



Member Since: 29 Nov 2009
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United Kingdom 2017 Range Rover Autobiography SDV8 Siberian Silver

I'm going to have to take one for the team and try this now, aren't I Laughing FFRR SDV8 Autobiography

Post #608984 12th Oct 2021 9:58pm
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AJGalaxy2012



Member Since: 11 Jun 2018
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keep us updated !!! BMW i3 Electric Car
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Post #608993 13th Oct 2021 5:09am
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Haylands



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If the engine and box are nice and warm and you have a standard auto box then holding it on the brake will not harm the box, it will overheat rapidly if left there for any time but what he did is fine...

It is one way to check the stall speed of the torque convertor... it is also how to do a stationary burnout in a two wheel drive car... Nail the throttle while feathering the brakes to use the non driven wheels to hold the car while the power spins the wheels...

It can make quite a difference to the 0-60 time in a turbocharged motor as it pre spins them...

It doesn't make much difference on the S/C as it has buckets of torque from tickover... I had to try one but I don't make a habit of it....


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Post #609003 13th Oct 2021 9:03am
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James W



Member Since: 29 Nov 2009
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Interesting thanks Thumbs Up

I've just tried it - yep, it does let you rev with the left foot on the brake, the drive is engaged as the vehicle squatted down under load. I didn't actually do the 'start' but I could have released the brake at 2500rpm and I'm sure it would have shot off.

This must be what they were doing on the videos. Calling it 'launch control' is a bit of an extension. Curiosity satisfied Thumbs Up FFRR SDV8 Autobiography

Post #609110 14th Oct 2021 11:06am
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swissomatic



Member Since: 16 Feb 2016
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Do the same thing in reverse and once you get tires all smoking haul it into drive you will get the familiar black J strips on the pavement. Occasional you will get the engine to run backwards which it doesn't do well.
Practiced on lots of rental cars, mainly two wheel drive with mixed results...blown engine, failed transmission, broken axle etc.

Why anyone wants to do racing starts in a 6,000pound plus, $100,000 plus 4wd luxury car is fascinating...although I will say the 5.00 SC surprises a lot of boy racers when you accelerate onto a freeway. Not sure the new BMW 4.00 Turbocharges will be quite the same..

Post #609126 14th Oct 2021 1:32pm
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