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Shurv
Albert Park


Joined: 09 Jan 2013
Posts: 1725
Location: Northampton


PostPosted: Mon Oct 15, 2018 7:43 am    Post subject: High Speed vibration Reply with quote

I get a pretty big vibration at speeds over 130mph, in Germany of course, that feels is coming from the rear of the car. I'm sure it isn't wheel balance, and the suspension has had the all clear from centre gravity. Might it be a sign that the engine mounts are on their way out? There is no sag from them but they are the original 2002 79k miles ones. Any ideas?.
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
Posts: 270



PostPosted: Mon Oct 15, 2018 8:06 am    Post subject: Reply with quote

I had a similar thing and it turned out to be wheel imbalance but it was at 90mph. What makes you think it's not wheel imbalance?
 
  
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cvega
Monza


Joined: 25 Feb 2013
Posts: 157



PostPosted: Mon Oct 15, 2018 8:49 am    Post subject: Reply with quote

it could be a wheel slightly buckled, hit any potholes recently? get them balanced again just to be sure. Balancing doesn't last forever... especially on our roads as is. Cheap fix possibly too.
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Grey996
Monza


Joined: 24 Jan 2017
Posts: 220
Location: Sheffield


PostPosted: Mon Oct 15, 2018 10:47 am    Post subject: Reply with quote

Tyre pressures?
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Shurv
Albert Park


Joined: 09 Jan 2013
Posts: 1725
Location: Northampton


PostPosted: Mon Oct 15, 2018 12:56 pm    Post subject: Reply with quote

I will fit my winter wheels next week when I have a week off, and then see if it still vibrates. If it doesn't I'll get the rims checked out. The rear tyres are pretty much gone, so I will replace the whole set over the winter in case I have a tyre causing the problem (the fronts are approaching 3mm anyway). It does point to wheels or tyres doesn't it?
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Jamesx19
Spa-Francorchamps


Joined: 10 Jul 2015
Posts: 357
Location: Brighton


PostPosted: Tue Oct 16, 2018 6:03 am    Post subject: Reply with quote

Wheel vibration would appear at 70 ish mph initially I'd have thought.

I did have some Powerflex gearbox mounts in recently, and over 100 leptons there was vibration. I took them out and it disappeared. On that basis maybe gearbox rubber mount needs looking at? The engine and gearbox assembly are only mounted in 3 locations, and the gearbox mount does the end with the driveshafts etc.....

Good luck
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
Posts: 270



PostPosted: Tue Oct 16, 2018 10:20 am    Post subject: Reply with quote

Wheel vibration can appear at any speed. Different levels of imbalance become apparent at different speeds.
 
  
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Magic919
Imola


Joined: 05 Jun 2013
Posts: 869
Location: Berkshire


PostPosted: Tue Oct 16, 2018 1:41 pm    Post subject: Reply with quote

My 996 felt ok in UK but vibration was at 140 up on autobahn. That was wheel balance.
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2620


1999 Porsche 996 Carrera 2

PostPosted: Tue Oct 16, 2018 3:24 pm    Post subject: Reply with quote

I wouldn't worry about it. I mean, how often do you go 130mph?
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Jamesx19
Spa-Francorchamps


Joined: 10 Jul 2015
Posts: 357
Location: Brighton


PostPosted: Tue Oct 16, 2018 7:07 pm    Post subject: Reply with quote

Quote:
Wheel vibration can appear at any speed. Different levels of imbalance become apparent at different speeds.


Ah ok. Makes sense. I don't go fast enough I reckon!
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5337
Location: Brighton


PostPosted: Tue Oct 16, 2018 7:23 pm    Post subject: Reply with quote

Ill just add .. rear wheel imbalence .. common cause of vibrations and always the first place to start .. ask for fine balence if your local garage does it .
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