Guy rolls his C7 Z06

[teamzr1]

Guy with a C7 Z06 Corvette goes off track and rolls at Willow Springs Raceway in Ca

 

[Stingray]

Bizarrely he wasn't going particularly fast. At about 5.55 (towards the end of the clip) you can see the speedo and it looks like 60-70 mph.

He must have had the electronic diff switched to a setting beyond his talent and got overtaken by excessive torque at the rear wheels. Sure, electronics don't change the laws of physics but I'd have expected them to catch that one - if allowed to. These cars have enough grunt to deserve respect every minute of the day but set them to "Track" and you'd better stay wide awake.

 

[teamzr1]

I suspect he put this supercharged Z06 into track mode and with cold tires' (they wearing coats) car got out from under him with oversteer and he was too slow to respond correctly

Wonder if that track sells on track insurance,
else he is in big sift, out of pocket for him one way or another, or enough damage to be written off

 

[Stingray]

Having looked at the video again you can see he's in Track mode and has also chosen "Sport 2" for the Performance Traction Management.

"The use of the PTM switch tells the car that it is definitely on dry asphalt (or wet asphalt in in mode 1) and that the driver is prepared for some amount of wheel slip. Since the surface is known the PTM system can make a good approximation of the maximum possible engine torque that will not over-slip the tires based on how hard the car is cornering and how fast it’s going. This torque estimate is used as a starting point (since no new information about the surface is needed in PTM) and then depending on the amount of slip that results more fine adjustments can be made. As the driver unwinds the steering wheel the tires gain grip and torque will be fed back in due to the lower slip.

"SPORT 2: This mode uses the exact same traction control settings as SPORT 1 but turns off ESC completely. This mode is designed as a way to turn off ESC while maintaining a fairly stable TCS calibration. After 10 to 15 consecutive laps it is likely that your fastest times will be achieved in SPORT 2 rather than RACE."

 

[Roscobbc]

Ah, the 'folies' of driving cars with Performance Traction Management and the like........driver becomes experienced on faster on-road driving and perhaps used to the the cars 'nanny' controls. Perhaps going in this car for the first time on the track naturally selects one of the track modes (well, you would, wouldn't you?) and is quite unready for the cars readiness to 'wag its tail' ........... big time - unfortunately having just coming on the the track and driving at what appears to be a relatively slow speed he is taken totally by surprise and just not fast enough to 'catch it'? - is that how it happened?

 

[Corvette]

Cold tyres and being a bell end.

 

[Forrest Gump]

It’s a concern why the car rolled though. It must have got onto some pretty rutted ground just off the edge of the tarmac. Circuit safety issue?

 

[Oneball]

It’s a concern why the car rolled though. It must have got onto some pretty rutted ground just off the edge of the tarmac. Circuit safety issue?

Anything soft and it can dig in going sideways, a bit of bad luck and you’re on your roof, fortunately not but close:

 

[Stingray]

"SPORT 2: This mode uses the exact same traction control settings as SPORT 1 but turns off ESC completely. This mode is designed as a way to turn off ESC while maintaining a fairly stable TCS calibration. After 10 to 15 consecutive laps it is likely that your fastest times will be achieved in SPORT 2 rather than RACE."

In Track mode he's already allowing a fair bit of slip and with Sport 2 selected as well he's gone "double or quits",

ESC off presumably means the thinking bit of the car car is no longer monitoring steering wheel angle, g-forces or the relative speeds of each road wheel.

TCS (the electronic diff) is all well and good but is now probably only monitoring the relative speed of the two rear wheels. So if you get them both slipping/spinning but still rotating at broadly the same speeds the diff doesn't know you're in trouble and won't tell the engine to reduce torque. So the driver needs to be quick getting that right foot off the throttle.

"As for the nannies, that term is a big gray area. I would personally call TCS, PTM, ESC and active rev match nannies but would not call the eLSD or MR dampers nannies. ABS is very gray. ABS, TCS, PTM, ESC and active rev match are trying to do a better job of something you normally do as a driver, steering, throttle, brake or shifting. However, no driver ever controls a differential directly or a shock absorber directly. They are part of the base chassis tuning and can be thought of as a calibration component like a spring or anti roll bar.

"ABS is more of a gray area but it is not allowed to be shut off because the capability of the vehicle is so limited without it. You may need 200 bar of brake pressure to get max deceleration from a wheel that’s on the outside of a corner but the inside wheel would be totally locked at 50 bar. Unless you want a lot of flat spotted tires you need ABS in that situation. Also, somewhat like eLSD and MR , individual wheel brake pressure is something even the best driver can’t physically control without the electronics.

"That’s a long way of saying you can shut off TCS, PTM, ESC and active rev match but you can’t shut off MR, eLSD or ABS."

With the amount of torque these cars can dump at the rear wheels I'm happy to leave "double or quits" settings for the experts!