Weird Vibration

[meadan]

hey guys,

I was wondering if anyone would have any ideas where my car might be vibrating from.

Its an r32 4 door with hicas removed, and some kind of aftermarket gearbox mount apparently.

When Im driving the whole car seems to vibrate, it gets worse at some speeds than others. Like at 60km/h its worse than at 80km/h.

Before I removed the hicas there was about 5mm play in the rear wheels, I thought that was the problem. But now its all fixed and the vibration has only been recused a little bit.

Would the gearbox mount cause the vibration? Even while rolling in neutral at speed?

[4core]

If your rolling in neutral with the noise happening then i doubt it has anything to do with the drive train.

A few things to check are;

1) Toe alignment on the rear wheels

2) Wheel bearings

3) Have you been "practising" hand brake turns or had to lock up the tyres? Flat spots in the tyres can cause this unwanted vibration and noise.

I would think that the solid gearbox mount would on help transmit the vibration issue further through the car as it is solid, but if your saying that you get the vibration even when coasting in neutral, i'd start from the ground and work backwards.

Hope this helps.

[Simon-S14]

diff and tailshaft still spins when car is in neutral so dont rule them out, could be work uni or CV joints.

check the above 3 things also.

[meadan]

Well the rear toe is all good. I only just had an alignment. Ill check to make sure nothing else has play in it though.

It occurs on other tires too, so they cant be the problem.

It feels like its coming from the middle of the car, so maybe tailshaft or soemthing? Though its hard to tell from the drivers seat lol.

Anyone had extra vibration from a solid gearbox mount?

[Simon-S14]

defo sounds like a uni joint problem mate.

take the tailshaft out and feel and inspect all the uni's by hand for any looseness and notching problems.

the solid mount will transfer more vibration but it will be a constant noise as the revs increase. not the sort of thing you are describing

[meadan]

ahh ok, ill have a look at that when i get a chance.

I just checked and the rear wheels for play and they are perfect. Yay for getting rid of hicas!

But the front has a bit of play, so new tie rods and ends would help.

The one thing i did notice was that one of the rear wheels doesnt have any weights on it. Im pretty sure none of the factory wheels were perfect, so maybe i should get that checked out too...

[Simon-S14]

rear wheels can be out of balance and be un noticable. fronts is another story tho

[-Jimmy-]

Centre bearing may be gone?