kotik

When i approach 180-190 mph the car starts violently shaking. There are no shakes at 150-160. My alignment was done recently, wheels are balanced, although rear wheel is bent a little, but balanced normally, and doesn't jump around on the stand. It comes in very violently, like someone on both sides is shaking it. I don't think it happens every time, at first I was sure it was due to wind, but i'm curious if there could be another cause to it.

Tide Will Roll!

How many runs at that speed has it did the violent shaking?

That may be hard to figure out because it may become catastrophic while trying to diagnose.

I would start with the bent wheel.

need-for-speed

Exactly ! Bent wheel at 180 mph.....WTF ?

Don-Vette

Taking the car to that speed with a bent wheel is stupidity IMO. Unless of course,you have a death wish. I would replace the wheel and inflate the tires to the recommendation for that speed.

jack5hd

BENT WHEEL...WHAT TIRES ARE YOU RUNNING?GOOD YEARS HAVE DIFFERENT INFLATION VALUES FOR DIFFERENT SPEEDS.

rstrait

A bent wheel at that speed is almost certainly the problem. When things go wrong at high speed it's all bad. Unless you've got a death wish don't go fast on a bent rim.

IrishSpuds

Jesus wept man, that's suicide! I had a minutely bent rim (a big shout out to the folks that repair our NJ roads HORRIBLY) that I am having fixed today. Almost invisible to the eye, on the inside of the rim, and this caused the shakes (though not violent) at 70 MPH. I imagine any Vette not in pristine shape is liable to kill you above 150. Fix it, put in a roll cage if you are tracking at that speed.

z51vett

He's on the street in Germany autobahn not track.
z51vett
Doug

IrishSpuds

Still would consider it on the autobahn, with the exception of a few areas, the autobahn is truly showing its age.

Steve_R

190 mph on a public road with a known bent wheel? Are you serious? Hopefully you'll only kill yourself and not take someone else out with you.

APACHEDR1V3R

I know you've seen those little crosses w/flowers on the sides of the autobahn...Have you ever wondered what lead up those being placed there?

Be safe while diagnosing.

not08crmanymore

You have a bent wheel and you're wondering why your car shakes??Alrighty then!!

JJC5

And you guys are all believing this??

David Terrebonne

I think you are getting ready for take off, you need to expand your wings

ls1121

you have a bent wheel and knowingly drive at that speed. Please sell your car.

Hameister

It is impossible for me to believe, that anyone would ask for an explanation, of violent shaking at extreme speeds, and then casually mention, and dismiss a bent wheel, as a possible cause.

Gimmee a break, the OP cannot be serious.

APACHEDR1V3R

I've had young soldiers tell me the same thing about their cars when we run vehicle safety inspections. I've experienced it in Germany, Korea, and here in the US. They get told as long as it balances, it's fine. It's mostly kids running fart cans, but nonetheless, they'll believe and justify it due to money issues. In their minds, it's dismissed as a cause for later problems.

michaelinmech

^ Perhaps the violent shaking will cease between 191 - 200 mph ??

11Black-GS

A few things come to mind.

1. You have a new tire that is "out-of-round".
2. There is tire separation from the wheel at that speed.
3. Possibly, there is something inside the new tire that is banging around (such as a piece of valve stem that fell in during the install).
4. The wheels aren't torqued correctly on your vehicle.

Z_Monzter

Agree