Steering wheel shaking at 75+ MPH

[speedyspaghetti]

Originally Posted by Racer Boy

It's my guess that it's one of the wheels. Like others have said, see if you can swap wheels with another Boxster owner and see what happens. You can also try switching right-to-left front wheels, and see if it feels any different.

Blackcloud has a good point, what kind of stem caps do you have?

Stem caps are the regular black plastic ones. Another member of the forum has graciously offered to let me swap wheels with him, so I will report back with that... hopefully this will be the issue.

[redciv1]

I had this issue on my wifes CLK350. After hitting a really bad pothole car was never the same. Finally replaced the wheel and probelm solved. Everyone said the wheel was fine but always a vibration. As previously said check the front wheels.

[speedyspaghetti]

Originally Posted by redciv1

I had this issue on my wifes CLK350. After hitting a really bad pothole car was never the same. Finally replaced the wheel and probelm solved. Everyone said the wheel was fine but always a vibration. As previously said check the front wheels.

I'm going to try on a set of wheels tomorrow - hopefully this is the problem! If that is the problem, where is the best place to find replacement wheels?

[Qckslvr]

I just realized you are relatively close to me.

PM sent on a shop that can help you if you need your wheels trued, or checked.

[PaulE]

Originally Posted by speedyspaghetti

I'm going to try on a set of wheels tomorrow - hopefully this is the problem! If that is the problem, where is the best place to find replacement wheels?

If you like the look of your wheels you should have them checked out by a good wheel shop and repaired if possible. If you buy used wheels you will need to do the same anyway as that is the only way to really be sure you'll be starting out with straight, round and true wheels. New OEM wheels are a fortune. If your wheels just need some truing it will not be that expensive. If they need refinishing and repair of any curb rash it costs more. For my 4 18" Lt. Alloy Carrera wheels, I paid about $1,000 to have them all trued and refinished. Three of the wheels needed only minor truing and two of those needed very minor curb rash repairs which were done by welding in new aluminum. The fourth wheel was a used wheel I bought very cheaply on eBay to replace one front wheel that was bent in multiple directions and beyond repair. The eBay wheel needed more extensive truing and curb rash repair,otherwise the total cost would have been $100-$200 lower.

[Gilles]

Speedy, thinking out of the box...

Many years ago I had a high speed vibration on the steering wheel on my X1/9 (also mid engine) and finally got get rid of it when replaced the front shock absorbers (struts),
perhaps you may want to check the condition of yours?
.

[andys320]

Strange as I had this issue, balanced wheels, new front discs etc, in the end it was cured with new rear discs, have no idea why but it solved my issue.

[speedyspaghetti]

Originally Posted by Gilles

Speedy, thinking out of the box...

Many years ago I had a high speed vibration on the steering wheel on my X1/9 (also mid engine) and finally got get rid of it when replaced the front shock absorbers (struts),
perhaps you may want to check the condition of yours?
.

I was hoping that this was the issue, but I already replaced the struts with new Bilstein B4s and that did not fix the issue.. I definitely learned a lot about working on cars though while replacing them, so I guess it was not all a lost cause... haha

[speedyspaghetti]

Originally Posted by PaulE

If you like the look of your wheels you should have them checked out by a good wheel shop and repaired if possible. If you buy used wheels you will need to do the same anyway as that is the only way to really be sure you'll be starting out with straight, round and true wheels. New OEM wheels are a fortune. If your wheels just need some truing it will not be that expensive. If they need refinishing and repair of any curb rash it costs more. For my 4 18" Lt. Alloy Carrera wheels, I paid about $1,000 to have them all trued and refinished. Three of the wheels needed only minor truing and two of those needed very minor curb rash repairs which were done by welding in new aluminum. The fourth wheel was a used wheel I bought very cheaply on eBay to replace one front wheel that was bent in multiple directions and beyond repair. The eBay wheel needed more extensive truing and curb rash repair,otherwise the total cost would have been $100-$200 lower.

You make a good point. I called a local wheel repair shop that has come highly recommended and they quoted me $35 a wheel to unmount, check, and remount, and then $200 a wheel to true/fix, I'll have a better idea once I try out the loaner front wheels this weekend if it really is the wheels.

[JayG]

Check out your local PCA chapter. Someone there may be able to help

[M1Combat]

I'm going with rack and pinion.