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Front Wheel Wobble - Can't Find The Cause!

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Old 08-21-2024, 08:37 PM
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ScottKelly911
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Originally Posted by Carlo_Carrera
If that is the case the only thing I think of is that the steering rack is shot/damaged.
That’s an interesting thought and possibility. He replaced almost everything in the front suspension with the exception of the coilovers and swaybars. Moving up to the Steering is a good next logical step. What could go bad within the steering system and how would one go about checking for it?
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Jedi767 (08-21-2024)
Old 08-21-2024, 08:46 PM
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I'm wondering if it's a shock, not sure the rack would have a harmonic imbalance at a specific speed , it would likely be doing it at all speeds.
Old 08-21-2024, 08:54 PM
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Originally Posted by 2fcknfst
I'm wondering if it's a shock, not sure the rack would have a harmonic imbalance at a specific speed , it would likely be doing it at all speeds.
I imagine it could be doing it at all speed but only noticeable at high speeds.
Old 08-21-2024, 08:57 PM
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That's kind of the point - if there is something causing a vibration that only is apparent at speed, this is likely some kind of an imbalance, and if everything else has been replaced, or repaired, may be something with the shock valving that is not allowing the shock to control itself correctly as speed increases.

Unfortunately, the only way to confirm that would be to pull the shocks and have them run through a shock dyno test.
Old 08-21-2024, 09:11 PM
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When you purchased the vehicle did it have a wobble in the front end?
Old 08-21-2024, 09:18 PM
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Carlo_Carrera
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Originally Posted by 2fcknfst
I'm wondering if it's a shock, not sure the rack would have a harmonic imbalance at a specific speed , it would likely be doing it at all speeds.
The speed factor might related to front end lift from aerodynamics.

Originally Posted by 2fcknfst
That's kind of the point - if there is something causing a vibration that only is apparent at speed, this is likely some kind of an imbalance, and if everything else has been replaced, or repaired, may be something with the shock valving that is not allowing the shock to control itself correctly as speed increases.

Unfortunately, the only way to confirm that would be to pull the shocks and have them run through a shock dyno test.
He says its a wobble, not a vibration. They are different. Also the rear spoiler deploys at 75mph. Pushing down on the rear and lighten the front.

Last edited by Carlo_Carrera; 08-21-2024 at 09:25 PM.
Old 08-21-2024, 09:22 PM
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Originally Posted by Jedi767
Ooooh - interesting idea.

Is there anything I can do at-home to check its condition?
I high end indy shop or a dealer have equipment that can test the rack.

A bad steering rack is still my guess.
Old 08-21-2024, 10:08 PM
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Originally Posted by racer959
When you purchased the vehicle did it have a wobble in the front end?
I'm not 100% certain. My guess is probably yes.

Originally Posted by Carlo_Carrera
I high end indy shop or a dealer have equipment that can test the rack.

A bad steering rack is still my guess.
Thanks for the input. I'm going to try and find a nearby shop that can look at that specifically...



Here is my current alignment (I've been through at least 4-5 alignments since the beginning of this, never a fix), I'll go add this to the 1st post as well.



Last edited by Jedi767; 08-21-2024 at 10:27 PM.
Old 08-21-2024, 10:17 PM
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That's the first thing that I would remember is a wobble in the front end when purchasing the car. So I don't think it was there. Something went wrong somewhere.
Old 08-21-2024, 10:38 PM
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Originally Posted by Jedi767
I'm not 100% certain. My guess is probably yes.



Thanks for the input. I'm going to try and find a nearby shop that can look at that specifically...



Here is my current alignment (I've been through at least 4-5 alignments since the beginning of this, never a fix), I'll go add this to the 1st post as well.
Alignment looks good. When you have the rack checked also check the rack mounts.

As Blockhed wrote CarFax isn't perfect. It is possible a previous owner hit a curb and had suspension parts replace but the impact may have tweaked the rack.
Old 08-22-2024, 11:44 AM
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I drove around with terrible front toe alignment and did not get a wobble. It's got to be a worn out part somewhere.
Old 08-22-2024, 11:58 AM
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Car running and stationary, if you turn the wheel side to side, can you feel anything?
Old 08-22-2024, 12:48 PM
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Originally Posted by Carlo_Carrera
The speed factor might related to front end lift from aerodynamics.



He says its a wobble, not a vibration. They are different. Also the rear spoiler deploys at 75mph. Pushing down on the rear and lighten the front.
Understood, this is a puzzle for sure.
Old 08-22-2024, 01:29 PM
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has the same shop been rebalancing the tires? Has anyone put a dial indicator on the brake disc flange or hub flange to check for runout?
Old 08-22-2024, 02:06 PM
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Originally Posted by 993GT
...Has anyone put a dial indicator on the brake disc flange or hub flange to check for runout?
Yes, I was thinking this should be checked as well. He might have a bad rotor.

Last edited by Carlo_Carrera; 08-22-2024 at 02:56 PM.


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