981 tyres scrubbing when turning

[ORD]

anonymous said:

[redacted]

It's only funny because of the current thread re people getting personal and unpleasant on PH.

[ORD]

anonymous said:

[redacted]

I think you have a slight anger management issue, dickface.

[bcr5784]

anonymous said:

[redacted]

Sure is.

Spoke to Porsche service dept today. Go on full lock on a (fairly) low grip surface (exiting my block pavia drive for example) and what I get is quite likely. Traction control intervention (the big metallic noise) mixed with tyre scrub (the little one in my case) No fault with my car and something others may well experience. As others have pointed out the degree of issue varies with the size and type of tyre.

I shan't bother replying further.

[nsm3]

As Bunny would say, C-U-S-T-AAAA-R-D.

[Ozzie Osmond]

It sounds as thought it's only a problem if you try to park with your right foot pressed hard on the throttle. Not my normal modus operandi so I'm not in the least bit surprised never to have encountered the issue. Or lack of it.

[bcr5784]

Ozzie Osmond said:

It sounds as thought it's only a problem if you try to park with your right foot pressed hard on the throttle. Not my normal modus operandi so I'm not in the least bit surprised never to have encountered the issue. Or lack of it.

Nop - absolutely minimum throttle possible to get moving, albeit up the (not that steep) hill my house is on.

[ORD]

bcr5784 said:

Ozzie Osmond said:

It sounds as thought it's only a problem if you try to park with your right foot pressed hard on the throttle. Not my normal modus operandi so I'm not in the least bit surprised never to have encountered the issue. Or lack of it.

Nop - absolutely minimum throttle possible to get moving, albeit up the (not that steep) hill my house is on.

You couldn't make this up. Chap complains about traction control issue to do with steering. Is told, rightly, that he will be experiencing a geo-based skip and clunk. It then turns out that he is pulling off on slipperly stones up a slope while winding on a lot of lock, causing slip at the rear and triggering traction control.

If you are losing an argument, change the facts or reveal the obviously most relevant ones only after you've annoyed the hell out of poor Cmoose.

[bcr5784]

Block pavia is not slippery stones. Given that I was being told that I was imagining the clunk, unable to tell a clunk from a scrubbing noise, traction control could not be operating and that there was something wrong with my car, that I must be using lots of throttle - all of which were incorrect, I hardly think I lost the argument.

[nsm3]

I suspect the problem is that no one believes you?

[bcr5784]

I don't wish to restart a slanging match, but I was trying to be very clear about the difference between the (obvious scrubbing) noise on video of the 911 and the noise my PSM makes. They are COMPLETELY and utterly different. The tyre scrub that occurs at the same time is also quite different - much higher frequency, much quieter and like gentle crushing of snow. If your PSM makes a noise like the video then I can understand your confusion. But the bottom line is that PSM intervention can accompany the scrub, is not necessarily a fault, and affects my car.

[bcr5784]

nsm3 said:

I suspect the problem is that no one believes you?

If they don't want to get a more complete understanding of the issue that's their problem, not mine.

[Ozzie Osmond]

Cold day here today. Lots of noise and jitter from the front tyres when parking. As expected.

[sootyvrs]

Just thought I'd mention it but I collected my new Cayman 981 a week or so ago and as expected I got the funny tyre noises when turning the steering wheel near full lock.

I had a previous 987 Cayman R which also did this and was concerned there was something wrong with the car before reading up it was normal!

Anyhow, I just replaced my wheels with a winter set (same 19" wheel design) with Continental N rates winter tyres and can report that I do not get the embarrassing noises no more so I guess tyre compound can have a significant effect in colder climates in relation to the "Ackerman" effect.

[iandc]

sootyvrs said:

Just thought I'd mention it but I collected my new Cayman 981 a week or so ago and as expected I got the funny tyre noises when turning the steering wheel near full lock.

I had a previous 987 Cayman R which also did this and was concerned there was something wrong with the car before reading up it was normal!

Anyhow, I just replaced my wheels with a winter set (same 19" wheel design) with Continental N rates winter tyres and can report that I do not get the embarrassing noises no more so I guess tyre compound can have a significant effect in colder climates in relation to the "Ackerman" effect.

I must take issue with you here. You mention "funny tyre noise". You must be VERY specific. Was it a "clunk" or a scrubbing noise. Otherwise we will never get to the bottom of this very serious issue!!

[sootyvrs]

iandc said:

I must take issue with you here. You mention "funny tyre noise". You must be VERY specific. Was it a "clunk" or a scrubbing noise. Otherwise we will never get to the bottom of this very serious issue!!

It's the clunking noise

[bcr5784]

sootyvrs said:

It's the clunking noise

Ah but was it a distinctly metallic clunk or a more wooden sort of clunk or possibly a combination of the two?

[iandc]

bcr5784 said:

Ah but was it a distinctly metallic clunk or a more wooden sort of clunk or possibly a combination of the two?

So now we are introducing 2 types of clunk!! Time for more experiments methinks!! How about a video and a vote on type of clunk? Could keep us going for weeks!

[bcr5784]

iandc said:

So now we are introducing 2 types of clunk!! Time for more experiments methinks!! How about a video and a vote on type of clunk? Could keep us going for weeks!

I do think that there is considerable scope for correlating propensity with temperature, rim size and tyre brand. I feel an almost irrestible urge to develop a theorem.

[cibble10]

So I can send someone or everyone over the edge... or maybe help with a theorem or two...

I have a 981 BGTS with 20 inch wheels, SS and PTV.

After pulling out of my garage I have to make a 90 degree left on tarmac. It appears to me that the inner rear left wheel makes a clunky noise as if it is being braked (and feels as if it is, a bit like ABS). I have assumed to date it was a quirk of the PTV at slow speed and on a hard turn. On returning home and reversing the process nothing happens that is out of the ordinary (no odd noises/behaviour).

My previous Cayman R did not exhibit this trait.

My AM V12V sometimes scrubbed a front tyre on a smooth surface (workshop floor) at slow speed on a tight slowish turn.

I am now about to sit in a trench with a tin hat firmly placed on my head...

[iandc]

cibble10 said:

So I can send someone or everyone over the edge... or maybe help with a theorem or two...

I have a 981 BGTS with 20 inch wheels, SS and PTV.

After pulling out of my garage I have to make a 90 degree left on tarmac. It appears to me that the inner rear left wheel makes a clunky noise as if it is being braked (and feels as if it is, a bit like ABS). I have assumed to date it was a quirk of the PTV at slow speed and on a hard turn. On returning home and reversing the process nothing happens that is out of the ordinary (no odd noises/behaviour).

My previous Cayman R did not exhibit this trait.

My AM V12V sometimes scrubbed a front tyre on a smooth surface (workshop floor) at slow speed on a tight slowish turn.

I am now about to sit in a trench with a tin hat firmly placed on my head...

Have you thought about replacing the tarmac with pave? You could then record both surfaces on a video for us all to keep us up to date. I think we need an algorithm including wheel size, surface, temperature, gas used to inflate tyres etc. etc.