gengar

Rear axle lift + Porsche RR = game over. We've seen so many GT3s and even Cup/RSRs eat it at this corner (Brünnchen). Hey, no harm no foul and at least it's out there being driven hard like it's supposed to be!

Available in HD, click here for the direct link to force HD: http://bit.ly/dEHkpP

http://www.youtube.com/watch?v=0k3_kdbXyCA&hd=1

Turbinator

I was expecting a crash, but I didn't see one. At least no one was hurt, then!

Turby

IS-SV

Thankfully a section of track with room for safety when dangerous things like this occur.

gengar

That's what I meant by "cheats death" - sorry for any confusion. I'm certainly glad no one was hurt and the GT2 RS survived!

2002GGPIS3

Don't lift!!, Nice save anyway..

Turbinator

So I thought spoilers were supposed to help prevent rear axle lift. Was this just a fluke deal then?

Turby

gengar

This is due to lift-off oversteer - downforce from a spoiler isn't going to counteract the huge forward weight shift from lifting off the throttle, especially when the engine is behind the rear axles and that weight that's suddenly no longer there is supposed to be providing the grip to the wheels driving the car forward.

superchan7

"One of those days where I wish I was driving a Turbo instead..."

Kostamojen

Lift off oversteer can occur just the same with an AWD car, you just don't want to over-correct and eat a wall...

http://www.youtube.com/watch?v=F_Yn3mNnvW4

Habious

Nice driving by the little blue car with the white top at the very end of the clip.

MR_F1

^ Oh, it's pretty popular with fwd cars too!

Lift off oversteer is not exclusive to one layout of car. It's just more prevalent with a few of them.

RX469

iTrader: (1)

Glad it survived. Now explain this, "Don't Lift" that's going on here?

gengar

Yep, things like AWD and various safety mechanisms like VSC/TRAC can help combat lift-off oversteer but the weight balance shift in many of these situations is simply extreme.


As I mentioned in my last post, a driver that is on the throttle (i.e., car accelerating) and suddenly lifts off the throttle (car stops accelerating) will cause a large and abrupt weight shift towards the front of the car, which takes weight off the rear tires causing them to have less available traction. Such weight shifts are very undesirable during cornering, as the loss of rear traction can result in dramatic oversteer.

In fact, shifting during cornering is generally thought of as undesirable even in dual-clutch/automated manual/clutchless vehicles, despite the very short engine retardation time compared to a complete throttle lift off.

oohpapi44

iTrader: (1)

More luck than any skill involved. Blind turn into a moving obstacle you just pick a side within that split second and pray you're on the good 50% side.

IS-SV

Good chance the car in video was running without electronic nannys in operation, or in other words as equipped "Porsche Adaptive Suspension Management (PASM), unique anti-roll bars, specific engine mounts and recalibrated Porsche Stability Management (PSM), whose stability and traction control functions can be switched off individually".