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After 700 miles, I took my 05 Vert for its first spin over 60 mph this past week. At 85 mph, I noted a sensation thru the steering wheel which I have never felt before. It was not a balance issue, but it almost felt like the lug notes might be loose. I retorqued and it did it again. With both hands on the steering wheel, it feels through the steering wheel like it wants to go left and then it wants to right and continues to do this. It does not do this at sppeds lower than 75.
It is Z-51 equipped, no mag ride. Vette mechanic at dealership says he can't duplicate it. Of course, he didn't take over the speed limit. Service manager is driving it home Monday and will get up to high speed.
My salesman said if it was mag ride equipped, thats the first place they would look.
Your Z51 has directional tires and will follow truck ruts in the tarmac as well as excessive crowns in the road. Blame cheap cities/counties for tarmac at only 4" depth. Sometimes higher tire pressures will help smooth some of it out. I run 34 pounds cold each, seems to help. The tires are not as bad as Toyo Proxies in this wander effect.
Did you jack the car - loosen, reset the wheels and retorque the lug nuts? If not you may have just tightened a bad situation. You might also check the alignment - there have been several post where the factory alignment has been (way) off. I haven't had any of your issues and have swapped wheels (track/street) several time making sure the wheels are "set" properly before the final torque. Good luck in getting it fixed what ever the cause.