Wheel bearing sound, need help diagnosing

[WhiteNissan300zx]

Hey guys, so my Supra sat in my driveway for about 3-3.5 months for the winter. Finally started driving it again and from 20-60mph or so you can hear a loudish humming sound. Gets louder on deceleration I feel like. Very very slight vibration in cabin at low speeds you can hear the trim vibrating, gf says she can feel something in the floor on her side. Could this be flat spots on the tires or a wheel bearing issue? How do I identify this? High speeds 70+ you don’t hear it really at all.

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[razorlab]

Is there rust on the rotors? try some hard braking and see if it goes away.

 

[puzzled]

I mean what PSI did you set your tires before hibernation? I use over 45psi and place my cars on Flatstoppers.. I've never had flat spots. Also 1psi change up or down based on 10F increase or decrease in temp respectively.. and usually observe 1psi loss per month (normal) if temp is constant. So one can calculate how much psi is in the tire just by placing a thermometer in the garage. I use a BT thermometer so that I can track temp from my iPhone.

Wheel bearing failure sounds like an eerie DC10 (jet) and gets louder as you speed up.. and will get progressively louder as the bearing break apart.

 

[lucky phil]

You can also isolate the side a wheel bearing is failing by driving in a straight line on smooth asphalt and initiating a turn in either direction and listening. The bad side will make more noise under the load of initiating a turn. Most "bad" wheel bearings in my experience end up being tyre issues but it's not out of the question esp if the car sees significant track time.
Phil

 

[WhiteNissan300zx]

I mean what PSI did you set your tires before hibernation? I use over 45psi and place my cars on Flatstoppers.. I've never had flat spots. Also 1psi change up or down based on 10F increase or decrease in temp respectively.. and usually observe 1psi loss per month (normal) if temp is constant. So one can calculate how much psi is in the tire just by placing a thermometer in the garage. I use a BT thermometer so that I can track temp from my iPhone.

Wheel bearing failure sounds like an eerie DC10 (jet) and gets louder as you speed up.. and will get progressively louder as the bearing break apart.

They were sitting around 30 when I started driving it again. And I’m not sure what psi when I parked them at. The winter was brutal in New England so lots of 10 degree days and nights, snow, etc

 

[WhiteNissan300zx]

Is there rust on the rotors? try some hard braking and see if it goes away.

No rust. My rear pads needs replacing though the light is on.

 

[WhiteNissan300zx]

You can also isolate the side a wheel bearing is failing by driving in a straight line on smooth asphalt and initiating a turn in either direction and listening. The bad side will make more noise under the load of initiating a turn. Most "bad" wheel bearings in my experience end up being tyre issues but it's not out of the question esp if the car sees significant track time.
Phil

It doesn’t get louder on the highway its mostly audible sound 20-50mph stays the same sound and then goes away at high speeds I feel like. I’ve tried doing the turning thing but I think it stays the same.

 

[concept]

It doesn’t get louder on the highway its mostly audible sound 20-50mph stays the same sound and then goes away at high speeds I feel like. I’ve tried doing the turning thing but I think it stays the same.

Does it go away when you step on the brakes?

 

[WhiteNissan300zx]

Does it go away when you step on the brakes?

Still there while breaking.

 

[olinares]

It happened to me, mostly when you steer the wheel from one side to the other (left to right for ex.) I went to the dealer and they change the bearings at no cost, because it was covered by the warranty.

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