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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHShake at hiway speeds(50mph and above)
Leading reported evidence
Check wheels and they seem
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Read evidence and context
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Performed · outcome unconfirmed · Original poster
I checked the wheels and they seem to be balanced ok.
Leading evidence: 'Check wheels and they seem' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check wheels and they seem' (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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Suggestion
An improperly installed component, a missing shim, a component left loose, or one that may have been bent or worn out before may now because of the suspension changes manifest a symptom it did not before with the stock springs.
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Suggestion · Original poster
They were not able to get the passenger side front set all the way so it is slightly out of spec.
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Suggestion
An improperly installed component, a missing shim, a component left loose, or one that may have been bent or worn out before may now because of the suspension changes manifest a symptom it did not before with the stock springs.
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2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T155324Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Recently lowered the car and noticed that the it starts to shake at speeds over 50mph. I checked the wheels and they seem to be balanced ok. I did not try to "road force" balance them though.
After putting the springs(H&R) on, I had the car aligned. They were not able to get the passenger side front set all the way so it is slightly out of spec. My seat of the paints guage tells me that the shake does appear to be coming from the passenger side front. When aligning they said they were at the limit with no more adjustment, of course I don't remeber what adjustment they were talking about.
The car does drift slightly to the right, not bad but noticeable.
My question is could a bad alignment cause a vibration at hiway speeds that has the same symptons of a wheel not being balanced properly? Could there be something the tech did not reattach properly?
Generally last thing touched is first thing suspect, but there's been several things touched...
Be sure the tires are all properly inflated. Check them cold. I've found even a few psi over-inflation can produce a vague sort of tire balance/shimmy symptom.
If you tell me the wheels/tires were ok before the suspension change and a close inspection of each wheel reveals no signs of any missing wheel weights, then re-balance probably not called for.
Then the issue becomes were the wheels installed correctly? The wheels and hub mating surfaces want to be clean and free of any dings, dents, etc. Also, the wheel lug bolts need to be torqued down properly, in sequence, and in several stages.
What are the alignment specs? You really need to get a copy of the before and after alignment settings. Some settings are neutral regarding shake/shimmy but some are not.
Regardless, you may have to go to special suspension hardware (Porsche or aftermarket) to provide enough additional adjustment the alignment can be brought spot on the money.
Then of course the spring installation has to come under some suspicion. An improperly installed component, a missing shim, a component left loose, or one that may have been bent or worn out before may now because of the suspension changes manifest a symptom it did not before with the stock springs.
In short you need to follow a process of elimination eliminating those items that are least expensive to eliminate and yet of course could still play a role, contribute to the symptom.
Sincerely,
Macster.
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