All Season Tyres. Help please.

[Porsche-Guru]

I'd be more worried about the risk of insurance voiding cover. no idea if it might count as a non gem modification. Though i did note on a recent quote i had on different car that the insurer didn't view switching to winter tyres as a modification.

I really doubt this… This would be a very touch task for insurance to justify that a non NFO or non * rated tyre is a modification !

I once had a run in with insurance (many many years back) when run-flats in BMWs were starting out… I had put in non run-flats on my BMW and (again from forum posts) decided to call up the insurer to check.
The guy on the other end stated that if the car came with run-flats then that is what they would expect.
I simply asked them to send me some paperwork in their T&C that would clarify this…. (prove that run-flats or non run-flats would be deemed a modification and violation of the manufacturer’s recommendations or anything else to the effect)… and within 15 minutes, a manager called back to apologise and stated that it was a non-issue.

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[Porsche-Guru]

The UK insurance system is definitely different from here in the Netherlands. I do not see any exclusion in my policy on tires/rims.

There are no such exclusions in UK policies either…. It is just that most people are super cautious about things like insurance and warranty… and no one wants a problem later…. so the easier solution is to stick with manufacturer stuff.
Dealerships do not help either and usually tend to advise similarly as it lines their pockets…

 

[Rik_CT4s]

Correct… Tyre sizes, speed & load ratings are the absolute requirements…

Afraid my spring/summer set won't qualify....
22 inch Vossen HF5....
9J front with 265-30-R22 conti sportco tact 6 XL tires
Rear 11J with 305-25-R22 Sportcontact 6 XL tires....
Well, they look to good...can't help it to mount them anyway

 

[WasserGKuehlt]

That’s why I want Novemberwhisky to watch the regen dial when braking. If it’s ABS during lockup regen should go to zero? Maybe it still blends regen even with ABS?

Regen does blend with ABS. I attempted several braking maneuvers from speeds in the 10 to 40 mph, on packed snow and ice. The first attempt was a bit strange - regen kicked in, traction was lost, pedal dropped immediately and regen cut off. This was around 13mph.

On subsequent, higher speed tests, regen continued even after ABS kicked in (and I could feel the hydraulic brakes engaging).

(Had also a bit of a moment at the transition zone from snow to ice - heading down towards a hairpin the car had zero traction under braking. Got lucky on that one, but the car remained remarkably composed. The ABS seems to be pulsating at a higher frequency than other Porsches I’ve driven in those conditions.)

 

[whitex]

Regen does blend with ABS. I attempted several braking maneuvers from speeds in the 10 to 40 mph, on packed snow and ice. The first attempt was a bit strange - regen kicked in, traction was lost, pedal dropped immediately and regen cut off. This was around 13mph.

On subsequent, higher speed tests, regen continued even after ABS kicked in (and I could feel the hydraulic brakes engaging).

(Had also a bit of a moment at the transition zone from snow to ice - heading down towards a hairpin the car had zero traction under braking. Got lucky on that one, but the car remained remarkably composed. The ABS seems to be pulsating at a higher frequency than other Porsches I’ve driven in those conditions.)

I've experienced the low speed drop off of regen when ABS kicks in, but never noticed at higher speeds. Will have to try it next time it snows and pay more attention (typically when ABS unexpectantly hits at speed I'm more concentrating on keeping the car on the road and going where I want it to, generally try to avoid ABS at speed in street driving ). It would be nice if they could use regen to somehow improve ABS braking over just mechanical ABS, though that would mean with cold or full battery ABS capabilities are limited.

 

[WasserGKuehlt]

(typically when ABS unexpectantly hits at speed I'm more concentrating on keeping the car on the road and going where I want it to, generally try to avoid ABS at speed in street driving ).

The things I do for this community.. ?

 

[WuffvonTrips]

It would be nice if they could use regen to somehow improve ABS braking over just mechanical ABS, though that would mean with cold or full battery ABS capabilities are limited.

Are we sure that, when regen continues during ABS activation, the regen isn't being pulsed along with the brakes?

 

[f1eng]

Are we sure that, when regen continues during ABS activation, the regen isn't being pulsed along with the brakes?

I would expect ABS being controlled electronically by regen would be so much faster than a traditional hydraulic system it could be implemented without pulsing.

It is after my time so zero hands on experience but I know one of the most difficult things to engineer was good brake balance on F1 cars once hybrid was introduced because they are RWD making balance under the crucial max braking phase difficult for the engineers.

Braking is one of the areas where driver skill in racing makes a big difference. ABS was banned in around 1993 iirc, we had been experimenting with it with Michael Schumacher but he spun a lot and it turned out he was judging grip level entering the corner by how close he was to locking wheels and with ABS couldn't get used it and always thought he had more grip than he had and went into corners too fast.

The safety and stability benefits of ABS are hard to explain to somebody who isn't used to driving fast without.

 

[WuffvonTrips]

I would expect ABS being controlled electronically by regen would be so much faster than a traditional hydraulic system it could be implemented without pulsing.

When the Taycan brakes are pulsing under ABS, do you reckon that regen is being modulated by the system?

Braking is one of the areas where driver skill in racing makes a big difference. ABS was banned in around 1993 iirc, we had been experimenting with it with Michael Schumacher but he spun a lot and it turned out he was judging grip level entering the corner by how close he was to locking wheels and with ABS couldn't get used it and always thought he had more grip than he had and went into corners too fast.

For the specific case of routine straight-line braking on a consistent surface, I was surprised to learn that it's possible to out-brake ABS just by backing off the pedal slightly once ABS triggers (that was an unskilled driver- me- under the guidance of a certified instructor) . Only under optimum conditions for controlled action on a track, rather than on public roads or in an emergency situation.

 

[simcity]

Been so mild and I’ve been lazy, so only got around to putting on the black 20” Turbo Aeros with Pzero Winters on yesterday.

Car is filthy. Don’t judge! ?

Immediate the difference in ride between the 21” spyders with Pzero summer and 20” TA’s with Pzero winter. That extra sidewall height will come in handy for pot-crater gate ?

 

[f1eng]

When the Taycan brakes are pulsing under ABS, do you reckon that regen is being modulated by the system?


For the specific case of routine straight-line braking on a consistent surface, I was surprised to learn that it's possible to out-brake ABS just by backing off the pedal slightly once ABS triggers (that was an unskilled driver- me- under the guidance of a certified instructor) . Only under optimum conditions for controlled action on a track, rather than on public roads or in an emergency situation.

I am not up to date on latest ABS technology but I was guessing that once the optimum slip ratio has been measured electrically it may be possible to hold it thereabouts without pulsing.
OTOH I think the pulsing is like cadence braking.

I have always been impressed by ABS working at all since the optimum slip may well vary continuosly in some road conditions.

My Ferarri 355 has a switch to switch off ABS (its only driver over-ride) and it is quicker without but that is a 25 year old system which doesn't work all that well...

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