rolling is explained by car not having a park brake on. On Ice I would never use that as the P mode would be pretty much the same. So assuming P would be similar state whilst it actually isn’t - spectacularly bad UX example by Porsche :/But people are claiming that their cars rolled, not slid. Having summer tires would not explain that.
Not saying this is the issue, but there is a big difference between summer tires in snow and having regular or all season tires. Its not about having special winter tires, rather how summer tires in snow will become very hard and brittle and may slide. In fact summer tires in snow will probably damage the tires.I dont buy that. Plenty of cars not on winter tyres in the U.K. not rolling down hills. Winter tyres are not as common in the U.K. as other countries. Something’s a miss with this!
If I may add some holistic science to this debate, the modulus of rubber, which can be conveyed in more layman’s terms as it’s softness, is the key point of difference between summer and winter tyres. Softer compounds of rubber have fewer cross links of sulphur between the polyisoprene chains of rubber that make up its structure. This means they can flex and move more easily at a molecular level; an analogy being that of being able to rub your hands together to generate heat and being less able to do so with sticky hands while wearing handcuffs. However, in both scenarios, when there is no movement, there is no heat generation. Things only start to change beyond this within the latex rubber structure below zero, when more hydrogen bonds between water trapped within the latex structure start to form, making it a lot more rigid. It’s why winter tyres are often mandatory in climates regularly sub zero vs those that aren’t, like the UK.Hi All
Just had a rather scary near miss and felt the need to warn people. Im a UK 4s owner, loving the car which Ive had for 6 weeks (pre cool issues aside).
We have had a classic UK snow fall overnight around a few cm's which is enough to decimate the town!! Drove my Taycan to the office and parked on a very slight incline, handbrake engaged. One foot out of the car and on the ground and the rolling starts!! A 2 ton car rolling on 3-4 cm of snow. Managed to get back in and pulled up a few feet away from a wall.
How the hell has this happened? Imagine this occurring on a sharp incline in a town centre?
Is there no anti-roll safety feature? My wheels were turning so I was told by a witness, meaning they werent locked or fixed by the handbrake.
I would definitely avoid parking this car on an incline in snow. Of more concern is the question as to how the car would behave in traffic facing downhill when stationary in these conditions?
Any thoughts welcome particularly from any UK dealers who may be aware of this issue.
Looking at https://www.taycanforum.com/forum/t...on-snow-bad-day-at-the-office-pt2.3394/page-2 and examining the posted picture, it seems that they key could be here:Incredible post! Thank you for your thoughts and scientific analysis.
So much excellent feedback on this thread
To add more to the mix, the brakes on my car were standard fit. This car was garaged overnight prior to driving to the office. Relevant? Not sure but it hadnt been sitting in snow like a block of ice all night. Nice 10 min drive to the office, not long enough to get the car components fired maybe?
I have considered whether this incident happened due to my own errors (weve all seen the Taycan wall climbing incident...terrifying!). I dont think it did because my muscle memory and actions when I park are well etched *but* I cant rule this out 100%
I have read the manual and the section on engaging handbrake before switching off the power. Did I get this wrong on the day...few seconds out? I dont believe I did. Is this mechanism normal on EVs where the handbrake doesnt operate once the power is off? Curious to know.
Im going to switch tyres. However I will not be parking on any inclines on snow again in this car. Something isnt right.
Lets hope there are no more incidents.
I’m with you on this one - my experience was slightly different but the concern was just as worrying. Driving at slow speed on some hail and the brakes couldn’t cope. The car didn’t stop at the giveaway and carried on. Fortunately there was no oncoming traffic. A serious issue that I’ll be bringing up with my OPC on Monday. I suggest this is also raised with the HQHi All
Just had a rather scary near miss and felt the need to warn people. Im a UK 4s owner, loving the car which Ive had for 6 weeks (pre cool issues aside).
We have had a classic UK snow fall overnight around a few cm's which is enough to decimate the town!! Drove my Taycan to the office and parked on a very slight incline, handbrake engaged. One foot out of the car and on the ground and the rolling starts!! A 2 ton car rolling on 3-4 cm of snow. Managed to get back in and pulled up a few feet away from a wall.
How the hell has this happened? Imagine this occurring on a sharp incline in a town centre?
Is there no anti-roll safety feature? My wheels were turning so I was told by a witness, meaning they werent locked or fixed by the handbrake.
I would definitely avoid parking this car on an incline in snow. Of more concern is the question as to how the car would behave in traffic facing downhill when stationary in these conditions?
Any thoughts welcome particularly from any UK dealers who may be aware of this issue.
Driving on hail? Are you sure this wasn't the ABS doing what exactly it was designed to do? Just because the car isn't stopping as quickly as you'ld like, doesn't mean it necessarily could stop any quicker. The ABS may very well kept the wheels rolling (so you had some steering) rather than locking them all up and sliding without ANY control.I’m with you on this one - my experience was slightly different but the concern was just as worrying. Driving at slow speed on some hail and the brakes couldn’t cope. The car didn’t stop at the giveaway and carried on. Fortunately there was no oncoming traffic. A serious issue that I’ll be bringing up with my OPC on Monday. I suggest this is also raised with the HQ
I was doing no more than a max of 10mph and brakes in plenty of time (with only a slight pressure on the brake)Driving on hail? Are you sure this wasn't the ABS doing what exactly it was designed to do? Just because the car isn't stopping as quickly as you'ld like, doesn't mean it necessarily could stop any quicker. The ABS may very well kept the wheels rolling (so you had some steering) rather than locking them all up and sliding without ANY control.
Just because you'ld like to have stopped sooner, doesn't mean it was possible given the situation.
Physics always wins.
I was out doing laps around my office building in unplowed snow yesterday (with ceramic brakes) and never had any indication that the brakes weren't doing exactly what they were supposed to do. (Even when you turn Stability Control Completely Off for Maximum Fun on snow/ice, ABS will still intervene while braking).
Did you not feel the ABS kicking in? What kind of tires do you have?I was doing no more than a max of 10mph and brakes in plenty of time (with only a slight pressure on the brake)