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911uk

High Speed vibration

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YOUR RESEARCHHigh Speed vibration

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Replace whole

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Suggestion · Original poster

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).

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High Speed vibration
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Leading evidence: 'Replace whole' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace whole' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace whole

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Reported fixes
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Suggestion · Original poster

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).

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High Speed vibration
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11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 911uk: 1 discussions

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POST 1 / ORIGINAL POSTEROriginal post

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?.

POST 2Original post

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?

POST 3Original post

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.

POST 5 / ORIGINAL POSTEROriginal post

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?

POST 6Original post

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

POST 7Original post

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

POST 8Original post

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

POST 9Original post

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

POST 10Original post

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

POST 11Original post

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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