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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 305



PostPosted: Sat Oct 27, 2018 11:14 am    Post subject: Low speed turning tyre scrub/ understeer Reply with quote

Hey.

I’ve noticed recently that my 991.1 does something odd when manoeuvring at slow speeds in car parks etc.

When driving forwards and turning sharp left or right, the front tyres judder and understeer slightly. Like they are skipping over the road surface.

This is at crawling speed only. It never happened on my 996.

It’s got 20” carrera s wheels, PASM -10mm, Manual transmission and done 47k Miles.

Has anyone else seen this? I’m concerned (as usual) that my car may have an issue?
 
  
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pzero
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General


Joined: 18 Jul 2010
Posts: 5283
Location: London


PostPosted: Sat Oct 27, 2018 11:36 am    Post subject: Reply with quote

A quick search returned this;

http://911uk.com/viewtopic.php?t=91102&highlight=&sid=f5389e4b7199a7042f952ee03c03b5a4
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6appeal
Montreal


Joined: 02 Jan 2016
Posts: 605



PostPosted: Sat Oct 27, 2018 1:32 pm    Post subject: Reply with quote

yes its completely normal. no issue.
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Kryton
Spa-Francorchamps


Joined: 05 Mar 2005
Posts: 354



PostPosted: Sun Oct 28, 2018 9:50 am    Post subject: Reply with quote

I've owned three 991's (.1 C2S, .2 C4S Targa, .2 GT3.) and they've all scrubbed their tyres as you describe OP
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MaxA
Albert Park


Joined: 11 Oct 2015
Posts: 1504
Location: Helsinki


PostPosted: Mon Oct 29, 2018 7:59 am    Post subject: Reply with quote

I have this. It's worse in the cold. Until I swap to winter tyres at least...
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mr pg
Nürburgring


Joined: 11 May 2007
Posts: 376
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PostPosted: Mon Oct 29, 2018 8:13 am    Post subject: Reply with quote

Notorious on 981's, but almost disappeared on mine since going from P zeros to Michelin PS4PS.
 
  
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tim993
Zolder


Joined: 22 Aug 2006
Posts: 5203
Location: Hampshire

2016 Porsche Boxster 981

PostPosted: Mon Oct 29, 2018 11:53 am    Post subject: Reply with quote

mr pg wrote:
Notorious on 981's, but almost disappeared on mine since going from P zeros to Michelin PS4PS.


yep - exactly as I found on our old 981. I thought perhaps the limited slip diff, might have contributed to this scrub Dont know
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Rob325114
Spa-Francorchamps


Joined: 12 Dec 2015
Posts: 298



PostPosted: Mon Oct 29, 2018 12:37 pm    Post subject: Reply with quote

Yep - I have this when the car is cold, and it's cold outside. Goes away once the tyres are warm, or the weather improves.

I did some searches when i first noticed it, and found it to be normal.
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Gottans
Monza


Joined: 25 Mar 2016
Posts: 237



PostPosted: Mon Oct 29, 2018 6:14 pm    Post subject: Reply with quote

I believe it is related to the suspension geometry, my Audi also does it and worse in the cold or when tyre tread depth is low as the tread blocks are stiffer.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6523
Location: Brighton


PostPosted: Mon Oct 29, 2018 8:24 pm    Post subject: Reply with quote

I agree with everything above and so will just say dont worry about it .
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matt_SM
Newbie


Joined: 11 Oct 2017
Posts: 45



PostPosted: Tue Oct 30, 2018 12:25 pm    Post subject: Reply with quote

Cold tyre scrub is not unique to the world of Porsche - plenty of modern cars with wide (performance bias) rubber will do this. The scrub becomes more obvious at this time of year because the temperature drops and the road becomes more greasy.

Whilst manoeuvring at low speed the outside tyre will scrub in a comparable way to slip angle on a track day.

We have an 'L' shaped driveway and both of our dailies have started to do this again as winter beckons.

Matt
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Martin Rose
Monza


Joined: 21 Jun 2003
Posts: 185
Location: Essex


PostPosted: Tue Oct 30, 2018 5:57 pm    Post subject: Reply with quote

I had a 981 as a courtesy car from OPC Colchester. Couldn't believe the noise when turning in the car park and went back inside to tell them something was wrong with the car. "They all do that sir" was the reply. Personally I couldn't live with that.
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