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May 22, 2012, 07:21:31 PM

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CARfaq.org > Forum > Campus > General Automotive > General Discussions > Lauch control on the Corvette!
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Author Topic: Lauch control on the Corvette!  (Read 198 times)
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Rippling Hurst
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Lauch control on the Corvette!
« on: August 21, 2009, 06:15:44 PM »

This is cool:

Quote
Launch control. On face, it's an anti-manly feature. Using it is an admission of incompetence; You're fundamentally admitting the car is it's own master, and you are only a passenger. Fine. It still makes a tire-shredding drag run ride a hell of an awesome thing. Launch control for the 2010 ZR1 is buried in the traction control options. So how do you do it? Press the traction control button twice and you put the car in performance mode, rock the ZR1-only traction knob once and you're sitting pretty in the performance dry programming.


Now is when all the magic happens. You put the car in first gear and mat the accelerator with the right foot, clutch with the left one. Normally this would mean bouncing the engine off its rev limiter and being a total prick to all the internal components, but in the ZR1 the engine bounces off the 5000 RPM mark then settles in right at the 4000RPM mark. With that 6.2 liter supercharged monster serenading you, the next step is to do what you're taught to never ever do with a manual transmission car — dump the clutch with extreme prejudice. It feels wrong, but it delivers results that are oh so right.

For the controls engineer in us, this next part is like magical happy land. To provide launch control, the car starts by measuring wheel spin. By measuring fleeting instances of wheel spin, it determines the surface friction available and the maximum amount of torque the wheels can handle at a given speed, it then sends a torque request to the engine which delivers the maximum power exactly by modulating fuel and spark for every instant of torque demand. It's a beautiful feedback loop which delivers crushing performance.

It's definitely fast, but it's very dependent on the driver too. Dog the clutch release and the car will bog down and only deliver a 4 second 0-60MPH time. Shameful. But if you let if go just right, like we did, you'll see a crushing, blistering, surreal times of only 3.48 seconds (Ben's being somewhat modest here. He had the best time of the day and best of all the auto journalists in attendance — Ed.). Considering the ZR1's quoted time with an experienced pro-driver behind the wheel is 3.4 seconds, this is as close to perfect as you can possibly get.

Of course, you can easily defeat the whole system and still get the "oh-my-god-this-car-is-trying-to-kill-me-but-this-is-awesome" experience, but you won't be beating every single car you line up against.
(Source)

http://cache.gawker.com/assets/images/12/2009/08/500x_ZR1_Graph.png


Too bad this amounts to reckless driving tickets.   But I say just don't do it when cops are around.   Grin

I do think every sport car (any car with a sport package) should have something like this, just to add to the fun.

Lauch control on the Corvette!
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oztiks
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Re: Lauch control on the Corvette!
« Reply #1 on: September 10, 2009, 08:21:13 PM »

I wish my car had launch control. I'm more than happy to admit my car is smarter than I am.

It's sad that people are scared to concede to the fact that technology in cars has surpassed human ability. Launch control, automatic transmissions, etc.

PS.. 3.4 second 0-60 is just downright scary.. another interesting item.  Mercedes (AMG side) a while ago (I think) had announced that they were giving up the "horsepower wars". Given the fact they are able to produce 1000HP+ but it's very difficult to actually get it all to the ground. Something to do with the laws of physics, i suspect? Smiley
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Rippling Hurst
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Re: Lauch control on the Corvette!
« Reply #2 on: September 10, 2009, 10:03:44 PM »

Quote from: oztiks on September 10, 2009, 08:21:13 PM

PS.. 3.4 second 0-60 is just downright scary.. another interesting item.  Mercedes (AMG side) a while ago (I think) had announced that they were giving up the "horsepower wars". Given the fact they are able to produce 1000HP+ but it's very difficult to actually get it all to the ground. Something to do with the laws of physics, i suspect? Smiley


Nah...it's all on the tires.  80's WRC 700-1000hp Lancias did sub 3s 0-60 on gravel...thanks to competition tires.  

We definitely need better tires, sportbike tires did a huge jump in the price/performance ratio in the last 15years.
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