Vibration at any speed.

[jcp]

Road Force balancers are a model of Hunter (I think) tire balancing machines. Discount Tire dealers in my area have them. Tire Rack service centers probably do also.

[blue62]

Road force balancers have a drum that is forced against the tire.
I forget what the pressure is but it simulates the forces of the road on the tire.
So the tire is balanced with a simulated road force on them as if they were on the car and being driven. Cost me $25.00 per tire/wheel but it was worth it.
eliminated all my minor steering wheel vibration through out the speed range.
I have had it up to 143 mph.

[blue62]

How many miles on the car??
Standard trans or auto???

There are two trans mounts I believe they are oil filled.
One center motor mount.
If they are bad it could be the cause of the vibration at idle.
The whoosh whoosh that increases with speed sounds like rotating mass that is out of balance.

Pull your front engine cover.
The one behind the seats.
idle the motor and see if anything rotating like alt. air conditioning pump, anything that rotates is out of balance or loose.

Then look at your axle mounting flanges to the transmission.
There are 6 (I think) torks or allen head bolts make sure they are tight.

Let us know how you go

[519AutoTech]

To eliminate possible wheel bearing issues, simply swerve left and right while driving with the noise present. If the sound changes, its wheel bearings. If the sound remains constant, its in the drivetrain or wheels/tires. Hope you resolve the issue

[RA1]

Originally Posted by 519AutoTech

To eliminate possible wheel bearing issues, simply swerve left and right while driving with the noise present. If the sound changes, its wheel bearings. If the sound remains constant, its in the drivetrain or wheels/tires. Hope you resolve the issue

Just did this, noise almost stops completely when slightly turning to the left. Gets worse when turning to the right. Does this mean rear driver side wheel bearing is bad?

[dghii]

Originally Posted by RA1

Just did this, noise almost stops completely when slightly turning to the left. Gets worse when turning to the right. Does this mean rear driver side wheel bearing is bad?

Do both. At this mileage, you're going to do both eventually anyway. This is a driveway job if you're handy. Wheel bearings are under $50 each. Pull your wheel hub and press out the bearing. If you don't have a press, go to a garage or auto parts store and have them press out the old and in the new. Not bad.

[blue62]

Way to use your senses.
See, hear, feel, smell, taste, your car when you drive it.
Then you start to sense things before they happen.

Now you have a direction to go.
Replacing bearings is not hard.
Let us know how things turn out.

[519AutoTech]

Originally Posted by RA1

Just did this, noise almost stops completely when slightly turning to the left. Gets worse when turning to the right. Does this mean rear driver side wheel bearing is bad?

It sounds like a left side bearing for sure. As to which one, you may have to use your "senses" as someone mentioned

[Gilles]

By removing the drive shafts you would be able to replace the bearings in site (without having to remove the hub) this way you will minimize the risk of damaging the ball joint rubber boot and the need to realign the rear axle.

You may want to borrow a wheel bearing removing tool or borrow a sledge hammer from Autozone (it will be a workout...)

Please note that the bearings have a magnetic strip on one end (for the ABS) and you want to install them the proper way, I learned about this the hard way..

Good luck

[BYprodriver]

Originally Posted by 519AutoTech

It sounds like a left side bearing for sure. As to which one, you may have to use your "senses" as someone mentioned

Easiest way to do this is to drive next to a wall at night when it's quiet outside, the wall will bounce the sound back to you louder on the bad side bearing.

[RA1]

Originally Posted by blue62

How many miles on the car??
Standard trans or auto???

There are two trans mounts I believe they are oil filled.
One center motor mount.
If they are bad it could be the cause of the vibration at idle.
The whoosh whoosh that increases with speed sounds like rotating mass that is out of balance.

Pull your front engine cover.
The one behind the seats.
idle the motor and see if anything rotating like alt. air conditioning pump, anything that rotates is out of balance or loose.

Then look at your axle mounting flanges to the transmission.
There are 6 (I think) torks or allen head bolts make sure they are tight.

Let us know how you go

I will do this thanks. As for checking the engine for loose accessories, the noise acts as a function of vehicle speed, not engine speed. And you're exactly right when you said It sounds like a rotating mass out of balance. I will check the motor mounts and trans mounts. But I'm so afraid its something inside the transmission that it out of balance and needs to be replaced. Smells like something that would hurt the old wallet. I'm an 18 year old straight out of high school working hard to make the Porsche dream a reality. But still praying that it's something stupid that I'm missing.

[BYprodriver]

Originally Posted by RA1

I will do this thanks. As for checking the engine for loose accessories, the noise acts as a function of vehicle speed, not engine speed. And you're exactly right when you said It sounds like a rotating mass out of balance. I will check the motor mounts and trans mounts. But I'm so afraid its something inside the transmission that it out of balance and needs to be replaced. Smells like something that would hurt the old wallet. I'm an 18 year old straight out of high school working hard to make the Porsche dream a reality. But still praying that it's something stupid that I'm missing.

It may be a bent wheel. Any time I am putting tires on unknown wheels, put the bare wheel on the balancer to see how out of balance the bare wheel is, so you have a baseline of what to expect balance wise before you blame the tire.

[blue62]

Originally Posted by RA1

I will do this thanks. As for checking the engine for loose accessories, the noise acts as a function of vehicle speed, not engine speed. And you're exactly right when you said It sounds like a rotating mass out of balance. I will check the motor mounts and trans mounts. But I'm so afraid its something inside the transmission that it out of balance and needs to be replaced. Smells like something that would hurt the old wallet. I'm an 18 year old straight out of high school working hard to make the Porsche dream a reality. But still praying that it's something stupid that I'm missing.

OK narrowed down to vehicle speed not engine speed
That should make it easier to locate.
Drive next to a building, wall, something that sound will bounce off of. With the building, wall, what ever on the right side of the car then on the left side.
See if you can isolate the whoosh whoosh sound to one side or the other.

Also if it is a standard transmission push the clutch in while moving at speed see if the vibration or sound changes.
These cars have a dual mass flywheel when the springs go bad they can go out of balance.
But always go with the easy things first. see if you can isolate the whoosh whoosh sound to one side or the other.

Like others have said it may be as simple as tire balance or a bent wheel.

[Gilles]

to isolate the noise of the drivetrain (engine/transmission) from the chassis, find a long downhill, turn off the engine and let it coast downhill if the noise still there is chassis related most likely a bearing or a sticking caliper...
.

[RA1]

So I found today on my drive that when the car is turning to the left on a curve or such the noise and vibration almost goes away. When going to the right it gets worse. Only enough worse though that I haven't noticed it until actually paying attention to it. Any ideas based off of this new information? ALSO... thanks so much to everyone that has responded and helped. I am continually amazed by the helpfulness and friendliness of the Porsche community.