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Vibrations once more ( very long)
Posted by Tapani (more from Tapani) on Fri, 18 Oct 2002 05:05:30
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Any ideas would be greatly appreciated:
-94 CSE FTP manual. Strange vibration problem starting at 108 km/h speed. Two sets of tire tried. Tires have an effect, but the vibration is still there with both sets. Snow tire (Gislaved Nord Frost 3)worse than summer tires (Nokian NRV). Changing summer tires to the rear -> vibration slightly less. All summer tires -> vibration even less, but not gone.
Rebound adjustment on the Koni Sports has a small effect. Stiffer means worse. Other than that only speed matters. Turning, accelerating, gear, free wheeling - no effect.
The vibration can also be heard. My guess is around 30-50Hz, i.e. 2-3 times tire rotation speed. The sound is quite strong.
Wheel bearings have no signs of damage. There's very small radial play in the inner drivers. Can just be felt. Also, there's small axial play in the left outer CV.
Could it be that the tire pattern wakes some of the natural frequencies of the whole body? I have poly lower control arm rear and outer front sway bar bushes + one upper engine mount.
Thanks for any input, experiences from similar problems, suggestions for what to check next.
Tapani
posted by 193.110.3...
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