Rotational Noise
 

I have a 2012 370Z A7. Last July I put on some new rubber... Michelin Pilots... Recently I've been hearing a rotational noise coming from the left rear area. It sounds like a tire noise although there is no abnormal wear or any kind of physical ramifications. No vibrations. Nothing. I brought the car to the dealer and they checked the bearings and said it was a tire noise. I took the car to the garage where I got the tires and they worked with me by switching the rear tires. Same noise left rear. They replaced each of the tires, one at a time, with the donut spare and each time the noise continued in the left rear. I'm not sure what to do. Noises like this drive me crazy and make it not fun to drive my toy! I just put it away for the winter so I'll have to fight with it next spring. Any ideas????

diff going out maybe? can you describe the noise better?

It sounds like a flat spot on the tire. As I go faster, the noise goes faster, until I get to 50mph and up. The the road noise blocks it out. I know it's not a flat spot though because there is no physical component. Besides, I've eliminated the tires and still have the noise.

Same issue
 

I have the same issue. Rotational noise even on newly paved highway. Someone said it was wheel bearing, but I think it is something else. No grind like a bad wheel bearing. Just a speed sensitive thump like a flat spot of tire. I can't pinpoint where the sound is coming from. Did you find the problem on your car?

Wheels bearing noises only arrive during turning (lateral) G forces.

...at least until it's destroyed, then it makes noise all the time. But you would have noticed this way before.

yah, i would assume it is the wheel bearing after swapping wheels with donuts as the tire place did.

that wouldve been my first suggestion, to try another wheel set.

Weird. Here's some of my thoughts.

Things It Could Be:
@ Something rubbing on the right axle or other rotating part in the drivetrain. As many times as the problem has been looked at, this may belong in the PBNP section.
@ Brakes or e-brake. E-brake on that side could be a little "tight" or warped. Foreign object in the drum or eccentricity. Glaze on rotor.
@ Differential problem. It can be difficult to tell where sounds are coming from when in the driver's seat. Sound may be coming from more inboard than you think.


Things We Can Rule Out:
@ Tire. Sound would have followed a bad tire.


Possible But Not Probable:
@ Wheel Bearing or Differential Bearing. As osbornsm said, bad bearings usually "growl" constantly in straight-line operation. But bearings can be weird. A cracked race could cause your symptom.