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YOUR RESEARCHBody Vibration at high speed 270km!!! please help
Leading reported evidence
Replace 4 wheel bearings.i
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
I changed cardan shaft ,front L/R axles (drive shafts), I changed all 4 wheel bearings.I changed the brake discs and brake pads.
Leading evidence: 'Replace 4 wheel bearings.i' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check list' (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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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.
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Performed · outcome unconfirmed · Original poster
I use Yokohama Advant ST tires and replaced almost two new sets.
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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Performed · outcome unconfirmed · Original poster
I changed cardan shaft ,front L/R axles (drive shafts), I changed all 4 wheel bearings.I changed the brake discs and brake pads.
Replace cardan shaft ,front l/r axles (drive shafts), i
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
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
I changed cardan shaft ,front L/R axles (drive shafts), I changed all 4 wheel bearings.I changed the brake discs and brake pads.
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.
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.
Suggestion
Check all plasticware under the car, for damage and secure fixing - if it's faulty and you hit it's natural harmonic then it will vibrate like crazy and shake the whole car.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I red all forum conversation regarding this matter and tried all the options that has been discussed but could not solve my problem. Any idea that you might want to share would be great for me.
Car:996TT (2001). I am the First owner and this Problem exist since 2007. Not a wheel wobble as such more of a rumble throught the whole car. I can feel the vibration throughout the car. Ä°t is very noticable through out the car and can be felt through the seat. Body starts vibrating at 270km and it feels like the car is going to shake itself apart. The weird thing is that the car goes very smooth till this speed than somehow this huge vibration starts in the car.
The list that I have done so far.
I use 19inch wheels w/a spacer on the car. Changed the wheels w/a new set. Axial run out is less than 0,5. I use Yokohama Advant ST tires and replaced almost two new sets.
I changed cardan shaft ,front L/R axles (drive shafts), I changed all 4 wheel bearings.I changed the brake discs and brake pads. I don't know what to do next but this is really annoying. Please help.
Thanks in advance for your valuable inputs..
Many years ago I worked in an environmental testing lab. One of the things we did was to vibrate equipment through a range of vibration frequencies and amplitudes as well as a full spectrum of white noise. We measured the reltant equipment response vibration as well as looked at the equipment with a strobe lamp. What this does is to expose the equipment, aircraft components in my case, to the types of frequencies they might be exposed to in flight and to see if they held together. It was amazing to see that, for the most part, everything held together, but when we hit a frequency that was in sympathy with a 'weakness' the thing just went ballistic. Essentially this is what you are doing when you drive your car through the speed ranges. In your case this appears to be a function of wheel frequency, and not engine frequency. Now I did have cause to use this experience on the car that I had at the time. It was a triumph stag V8 which delivered the type of experience that you are describing, but at 50mph! It turned out to be one of the wishbone top hats that secured the wishbone to the body via a rubber/metal fixing.
My recommendation would be to look at the following;
1. Check all plasticware under the car, for damage and secure fixing - if it's faulty and you hit it's natural harmonic then it will vibrate like crazy and shake the whole car.
2. Get anything that attaches to the body checked out, especially where rubber is involved, this includes engine mountings and suspension components.
I hope it's 1 above as it should be cheaper and easier to fix.
If that all fails, try and get your car on a rolling road and the shine a strobe under the car when the car is moving - this will definitely show you where the problem is, it should exhibit the problem at the lower speeds but the amplitude of movement won't be so severe. I don't know if health an safety rules would allow you to get under a car when it's rolling :dont know:
Good luck
Ray :thumb:
Many thanks for all of your inputs. I take all ideas into considiration and adding my checklist till I have enough information to bring the car workshop. As I said I've been dealing w/this problem since 2007 and it's really annoying and frustrating. it's like you have the available power under your seat but things are limiting..Again, I thank each of you sharing your experience w/me.
thanks
sertac
Agreed with above NDT (Non Destructive Testing) methods.
Could also get someone to cruise by at 271 kph in a 997 and give a cursory inspection with mk1 eyeball. Could be something simple like a trapped badger!
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