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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHShaky shaky!!!
Reported or suspected cause
although the wheels and tyres were perfectly balanced
Reported cause
No successful repair reported for this finding.
1
Identified cause
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Suspected cause
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Reported fixes
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
It turned out that although the wheels and tyres were perfectly balanced on the rig, ie rotating in free air, the problem was that one tyre was not perfectly round and had a slight high spot.
Install 'wrong" way round (are they directional / asymmetric
No successful repair reported for this finding.
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Unsuccessful attempts
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed
It's possible that one or of the wheels has been damaged, or the tyres have worn unevenly and one or more has been fitted the 'wrong" way round (are they directional / asymmetric?).
Leading evidence: 'although the wheels and tyres were perfectly balanced' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'although the wheels and tyres were perfectly balanced' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install 'wrong" way round (are they directional / asymmetric' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Install 'wrong" way round (are they directional / asymmetric
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
It's possible that one or of the wheels has been damaged, or the tyres have worn unevenly and one or more has been fitted the 'wrong" way round (are they directional / asymmetric?).
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
The car has had most of the front suspension replaced prior to me owning it but recently and I'm planning on doing the rear.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
The only thing I have thought which I'd value opinions on is that the tyres were 4000miles used, Michelin pilot3's.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Install 'wrong" way round (are they directional / asymmetric
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
It's possible that one or of the wheels has been damaged, or the tyres have worn unevenly and one or more has been fitted the 'wrong" way round (are they directional / asymmetric?).
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Unsuccessful attempt
Interestingly i had a horrible shake that started above 90 mph, changed coffin arms, tuning forks, balancing etc. severral indy services and the problem persisted.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
although the wheels and tyres were perfectly balanced
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
It turned out that although the wheels and tyres were perfectly balanced on the rig, ie rotating in free air, the problem was that one tyre was not perfectly round and had a slight high spot.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Had my wheels refurbished. Look good but...........been on a road trip and there is a hideous vibration!! Not too bad up to 70mph but above that on the motorway it can be felt in the steering wheel, base of the seat. That bad at one point my missus even commented how terrible it was. I'm assuming just a woefully inadequate job on the balancing as the bolts are tight, hubs and rear faces of the wheels were clean. The only thing I have thought which I'd value opinions on is that the tyres were 4000miles used, Michelin pilot3's. It's conceivable these are now on the wrong side, would that have an effect??
All the weights are near the spokes, which makes me wonder as surely an 11inch rear would have some weight on the other side also if they were balanced properly. I'll take it to someone in the week. Bit disappointing when you've paid for a service and it's a tad crap!! Done 650miles over the weekend which have mostly been spent gripping the steering wheel like I'm trying to choke it!!!
You probably aren't feeling the rears. Whether a wide rear needs weight on both edges is up for debate. Unless it's a higher weight, most places would just place at one edge.
You can start on Google and look at static and dynamic balancing. Or try to find someone with a Hunter Road Force Balancer. The people I used to use are no longer trading, sadly.
Sounds like poor wheel balancing. I had the exact same issue (only felt it at v high speeds!!) after having some new tyres fitted at a local place I've always taken my cars to. Anyway had them rebalanced while the car was recently at RPM and now there're perfect!
Interestingly i had a horrible shake that started above 90 mph, changed coffin arms, tuning forks, balancing etc. severral indy services and the problem persisted.
Recently had a full geo setup (was miles off) plus new springs and dampers and the car is transformed so thought I'd add this as a possibility, my feeling is the geo was the issue.
The car has had most of the front suspension replaced prior to me owning it but recently and I'm planning on doing the rear. It's not got as much 'poise' as my previous 996 so I think there are items that will improve it in general but the vibrations are certainly new after the wheels have been refurbed or definitely a lot worse anyway since that so I'm fairly convinced that's related. I was concerned the tyres been worn and then on the wrong side could be an issue but 650-700 miles this weekend would surely have put that to bed so I'm guessing it's balancing. I'll have them balanced somewhere I trust this week and they'll be dynamic balanced so we'll see what that produces. The road force balancing looks great but I can't seem to find anywhere that does that locally or even relatively local to me!
It's possible that one or of the wheels has been damaged, or the tyres have worn unevenly and one or more has been fitted the 'wrong" way round (are they directional / asymmetric?).
From what you've described though I agree it's by far most likely to be balancing so hopefully easily resolved.
I had a very similar problem. It turned out that although the wheels and tyres were perfectly balanced on the rig, ie rotating in free air, the problem was that one tyre was not perfectly round and had a slight high spot.
So it gave similar symptoms to an out of balance (mass) but was actually out of round.
New tyres fixed it instantly.
Right so the plot thickens and now I am concerned!!!
Nipped to see a guy I know, wheels off and onto the balancer. Not a one of them balanced up anywhere near. So he rebalanced and I set off. Car felt better, gave it a run up to speed and then onto a motorway for a quick run and shaking itself to bits again!!
I'm going to get the car on a ramp to check it this week but I can't understand why a suspension component would fail and it be in coincidence with the wheels been refurbed. It's not inconceivable but it'd be a hell of an odds.
In desperation I'm trying to find some other wheels to borrow to check them against it.
The hubs and wheel backs are clean. I was going to reclean them and swap wheels (left to right) but I feel like this something more than that
I can't see it myself as they'd have noticed it when balancing. i.e. spin wheel, add weights, spin again to check. They'd never in a million years be able to have them running true on the balancer.
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