[Z06] Launch Control and Drag Radials???
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Joined: Sep 2010
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From: Troy NH
Launch Control and Drag Radials???
Anyone try this yet? Got a new set of 19" stickies and want to know how well it works both without and with drag radials. I figure at the very least it will give me consistancy when trying to determine what tuning/mods have made the most difference throughout the course of my build.
Thanks,
Mike
Thanks,
Mike
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
You don't want to use launch control on a prepared racing surface at the drag strip. That goes for stock tires or DR. It's slower and prone to forcing bad wheel hop.
Launch control attempts to modulate wheel spin on a street surface.
The other issue at the track with LC is that it is tied to "Competitive Driving" mode, which gives relaxed Active Handling. With the wall about 8-10 feet from the side of the car, you want the aggressive form of AH to help if the car gets loose. That means running in "Traction System Off" (one push of the console button).
Ranger
Launch control attempts to modulate wheel spin on a street surface.
The other issue at the track with LC is that it is tied to "Competitive Driving" mode, which gives relaxed Active Handling. With the wall about 8-10 feet from the side of the car, you want the aggressive form of AH to help if the car gets loose. That means running in "Traction System Off" (one push of the console button).
Ranger
Melting Slicks
Joined: Jul 2007
Posts: 3,097
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From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Anyone try this yet? Got a new set of 19" stickies and want to know how well it works both without and with drag radials. I figure at the very least it will give me consistancy when trying to determine what tuning/mods have made the most difference throughout the course of my build.
Thanks,
Mike
Thanks,
Mike
With drag radials it was a different story as I was cutting killer lights (.002, .007 and .010 if I recall correctly) and ended up making it to the semi finals with the car.
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Max Acceleration in a C6 and C6Z06 and C6ZR1: Use “Traction System Off”
Ranger
Le Mans Master
Joined: Dec 2009
Posts: 5,709
Likes: 6
From: Midwest
How good is AH, really? Will it keep you off the wall if you put both feet on the floor and are intelligent with the steering-wheel, or not really?
What I am asking is, in recovering from a yaw, is it 5% of the equation, or 95%?
What I am asking is, in recovering from a yaw, is it 5% of the equation, or 95%?
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
^^^
Even among Olympic-level athletes, measured human reaction time is 150-200 milliseconds. That's the duration from signal to first muscle movement. That's execution of a expected movement practiced thousands of times. For reference, the blink of an eye is 300 milliseconds.
On the 1-2 gear change at the drag strip the car is moving (let's say) 60 mph. that 88 feet per second, or 13-17 feet in 150-200 milliseconds.
In the racing groove the car is separated from the wall by about 10 feet. At a 45 degree yaw angle, the separation is 14 feet.
So, in all likelihood, even with an olympic-level reaction time, the car strikes the wall before the driver can react. And that's best case, because a yaw event, unlike an Olympic start, is an unexpected event.
Now consider Active Handling. The sensors are reading conditions every 10 milliseconds and making necessary adjustment to reconcile yaw. At 60 mph, the car travels less than 1-foot in 10 milliseconds.
That's why in my two loose events at the drag strip in Traction System Off, the aggressive form of Active Handling recovered the yaw and signaled (through intervention) that I needed to lift the throttle.
AH reaction time is 10X-20X faster than a human's.
Owners, of course, get to decide how much risk they wish to accept. But taking on risk for no performance reward is ill-advised and reckless in my view.
Ranger
Even among Olympic-level athletes, measured human reaction time is 150-200 milliseconds. That's the duration from signal to first muscle movement. That's execution of a expected movement practiced thousands of times. For reference, the blink of an eye is 300 milliseconds.
On the 1-2 gear change at the drag strip the car is moving (let's say) 60 mph. that 88 feet per second, or 13-17 feet in 150-200 milliseconds.
In the racing groove the car is separated from the wall by about 10 feet. At a 45 degree yaw angle, the separation is 14 feet.
So, in all likelihood, even with an olympic-level reaction time, the car strikes the wall before the driver can react. And that's best case, because a yaw event, unlike an Olympic start, is an unexpected event.
Now consider Active Handling. The sensors are reading conditions every 10 milliseconds and making necessary adjustment to reconcile yaw. At 60 mph, the car travels less than 1-foot in 10 milliseconds.
That's why in my two loose events at the drag strip in Traction System Off, the aggressive form of Active Handling recovered the yaw and signaled (through intervention) that I needed to lift the throttle.
AH reaction time is 10X-20X faster than a human's.
Owners, of course, get to decide how much risk they wish to accept. But taking on risk for no performance reward is ill-advised and reckless in my view.
Ranger
Last edited by Ranger; Apr 28, 2011 at 09:01 AM.
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Le Mans Master
Joined: Dec 2009
Posts: 5,709
Likes: 6
From: Midwest
^^^
Even among Olympic-level athletes, measured human reaction time is 150-200 milliseconds. That's the duration from signal to first muscle movement. That's execution of a expected movement practiced thousands of times. For reference, the blink of an eye is 300 milliseconds.
On the 1-2 gear change at the drag strip the car is moving (let's say) 60 mph. that 88 feet per second, or 13-17 feet in 150-200 milliseconds.
In the racing groove the car is separated from the wall by about 10 feet. At a 45 degree yaw angle, the separation is 14 feet.
So, in all likelihood, even with an olympic-level reaction time, the car strikes the wall before the driver can react. And that's best case, because a yaw event, unlike an Olympic start, is an unexpected event.
Now consider Active Handling. The sensors are reading conditions every 10 milliseconds and making necessary adjustment to reconcile yaw. At 60 mph, the car travels less than 1-foot in 10 milliseconds.
That's why in my two loose events at the drag strip in Traction System Off, the aggressive form of Active Handling recovered the yaw and signaled (through intervention) that I needed to lift the throttle.
AH reaction time is 10X-20X faster than a human's.
Owners, of course, get to decide how much risk they wish to accept. But taking on risk for no performance reward is ill-advised and reckless in my view.
Ranger
Even among Olympic-level athletes, measured human reaction time is 150-200 milliseconds. That's the duration from signal to first muscle movement. That's execution of a expected movement practiced thousands of times. For reference, the blink of an eye is 300 milliseconds.
On the 1-2 gear change at the drag strip the car is moving (let's say) 60 mph. that 88 feet per second, or 13-17 feet in 150-200 milliseconds.
In the racing groove the car is separated from the wall by about 10 feet. At a 45 degree yaw angle, the separation is 14 feet.
So, in all likelihood, even with an olympic-level reaction time, the car strikes the wall before the driver can react. And that's best case, because a yaw event, unlike an Olympic start, is an unexpected event.
Now consider Active Handling. The sensors are reading conditions every 10 milliseconds and making necessary adjustment to reconcile yaw. At 60 mph, the car travels less than 1-foot in 10 milliseconds.
That's why in my two loose events at the drag strip in Traction System Off, the aggressive form of Active Handling recovered the yaw and signaled (through intervention) that I needed to lift the throttle.
AH reaction time is 10X-20X faster than a human's.
Owners, of course, get to decide how much risk they wish to accept. But taking on risk for no performance reward is ill-advised and reckless in my view.
Ranger
Just trying to figure out how much of a safety measure it really is, or if it works about as well as Launch Control.
WOW! Failure analysis?
