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Steering bit shake

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Old 12-23-2022, 03:15 PM
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FreshDriver
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Default Steering bit shake
(it seems posted in wrong section, admin can delete if necessary)

Hi, Porsche dealer retrofitted PASM- S from PASM

So the car changed from 10mm low to 20mm low

Now I have a bit of steering shake while passing over rough parts of highway, uneven pavement, etc.
Dealer has been unable to find how to fix it.
Car was aligned after the retrofit.
Check the video, it shakes a bit to right.
Any ideas ...? Where to check?
Last edited by FreshDriver; 12-23-2022 at 03:32 PM. Reason: Wrong section..Admin can delete it from here? I'll post it in the right section
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Old 12-27-2022, 03:33 PM
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Do you have the alignment results? I am guessing one side has a significant amount more toe in than the other.
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Old 12-28-2022, 11:56 PM
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Bob Z.
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I moved your thread - good luck! And I would find another shop to check the alignment.
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Old 12-29-2022, 02:42 AM
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If it happens only at certain speed, then likely wheel balancing is off.
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Old 12-29-2022, 06:52 AM
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Have you have the front tires road force balanced?
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Old 12-29-2022, 11:37 AM
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Originally Posted by LWG
Have you have the front tires road force balanced?
Why do you think road force balance would be different to a standard balance machine ?
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Old 12-29-2022, 11:51 AM
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Since you lowered another 10mm, your probably introducing some bump steer in the suspension. Have you checked this?
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Old 12-29-2022, 12:03 PM
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Originally Posted by FreshDriver
Why do you think road force balance would be different to a standard balance machine ?
Road force is another level. I have had road force balancing sort out issues on various cars.

With that being said, I am sure your Porsche dealership has the latest Hunter road force machines.
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Old 12-29-2022, 12:49 PM
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Originally Posted by Viper pilot
Since you lowered another 10mm, your probably introducing some bump steer in the suspension. Have you checked this?
Yes, It may be possible...but I wonder since steering tie rods are same between PASM and PASM-S.. All GTS 4.0 with PASM-S from factory does come with bumpsteer problems from factory?
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