BlackCat

iTrader: (6)

At certain mphs my PZero Nero tires give off such a loud rumbling. I've got my air pressure at 36psi. Recently I changed my springs, going back to my Eibachs from S-Techs. Am I out of alignment which is causing the noise?

z32drifter

Just being out of alignment should not cause the noise. If you have a unusual wear pattern from an alignmant issue that could cause tire noise. Look close at the tires and you can even rub your hand over them to see if the wear pattern is smooth. If you see or feel sharp edges on some of the tread blocks get your alignment corrected, the noise should go away once the tires are worn smooth again.

BlackCat

iTrader: (6)

Had an alignment done yesterday after work and it did help reduce the noise. I found the inside crown of my front driver's side to be prematurely worn down
Going to rotate the tires to see if that helps as well.

BlackCat

iTrader: (6)

Found out that its giving off symptoms of worn wheel bearings.

z32drifter

Does the noise change when you load and unload that side of the car?? You can normally hear a bearing get louder if you load it, like going around a corner. Tire noise also changes with load, so be careful in your testing. You could try moving the damaged tire to a diff location and see if the noise follows.

BlackCat

iTrader: (6)

I rotated the tires on the weekend and that didn't make any difference. The back is quiet and feeling some slight vibration in the steering wheel and some slight buzzing in the dash that wasnt' there before. I do notice the increase in noise on the highway as I'm taking a sweeping left curve at 80kph. Having it looked at today.

BlackCat

iTrader: (6)

Now that the wheel bearings have been replaced everything is real quiet and smooth now. I take it back as there was nothing wrong with the PZeroes.