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Originally Posted by RandallNeighbour
John, I had hours and hours on the road to look for what you are talking about with the 3000 to 3300 rpm vibration issues. I do not think this is the problem.
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That's good news. It's not a cheap fix.
Just blowing through ideas so ignore any you think are a little off from what you've been experiencing on your trip.
Have you ever cleaned your ABS sensors? They are magnetic so they can have metallic brake dust stick to them and eventually not "feel" the wheel moving. My 928 did that and caused major vibration at speed. They should be cleaned at every brake change.
How many miles do you have on her? If high mileage, wheel bearing issue?
Have you ever used "fix-a-flat" or the like in any of the tires?
Have you had any of the tires plugged?
Do you have metal Porsche crested caps? (This one can get you if the guys take the caps off, check the pressure and balance them, then put the caps back on since they are heavy caps.)
Bad/worn shock or spring?
Pressure correct in all of the tires? Everyone who has balanced the Boxster has filled them to the standard 32/32 psi instead of the Porsche recommended 29
Front/36 Rear.
Loose undercarriage cover or front bumper?
I know it's a lot of stuff to consider, but there are so many things that can cause vibration. Hope you find it soon!