Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Thu Apr 22, 2010 10:14 am
Between 55>65 mph the tire and rotor imbalance frequency and the body resonace frequency combine to be the most feelable range.
Since the brake pads slightly drags against rotors the vibration is always coupled.
The frequency of the vibration vs exact speed [mph] is what tells you exactly the rotating source in need of correction:
TIRES, wheel [without tires] rotor truing, bearings, etc.
The vibrations are always there, just that rubber wear u=in suspension isolators allows more and more to be felt.
On early Q I always replaced tension rods at 4 year or 60k intervals to minimize vibration transmission...........probably a great but expensive habit to continue thru today.