REALLY LOUD INTRUSIVE TYRE/ROAD ROAR

[Polly]

From my 7k old PS4S's on my 2018 Cupra R.
So bad I suspected a wheel bearing issue.

It does vary with speed and road surface. Makes my ears numb. Seems rears mainly.

Any suggestions.
I have a roll of unused sound proof felt. Going to start with boot floor separator panel I used to put it under the rear seat squab. But may not be room. How does it lift up.

Any other suggestions. Tyre pressures HI/LO. The tracking is fine.

Any quieter tyres out there?

 

[SRGTD]

Check the inner tread on the rear tyres. If they’ve worn in a stepped, sawtooth pattern they’ll produce a sound very similar to worn wheel bearings. You can often see the stepped pattern - if not you should be able to feel it if you run your hand around the inner tread of the tyres. I had this issue on a mk5 Golf many years ago.

Sawtooth tyre wear - also known as cupping - is quite common on cars with independent rear suspension.

 

[Polly]

bril Yes I get that check tomorrow.
Cheers

 

[TripleBob]

Yeah that's never right, the PS4's are a pretty quiet tyre - so definitely wants investigation... SRGTD has definitely pointed to the likely culprit, you shouldn't need extra sound proofing to filter it out!
If you do decide to add extra for refinement though I'd seen somewhere on here you get the best results from doing inside the wheel arches, but thats obviously quite an awkward and time consuming process!

 

[Polly]

Thanks guys.
Checked this morning. Not immediately obvious visibly. Run my hands around seem the same front and rear. Blocks on the inner and outer have a very slightly sharp edges all the way round. No distinct raised bits as the cupping.

Also seems there's already the rubberised horse hair effect sound proofing in the rear arches so bit stumped.
Its 3rd service Tuesday so will engage with the techie and ask for opinion.

Previously I would have heard/said shot rear wheel bearings. [The rear discs have been off twice now for damp seized pads and agin the next service.]
THEN why would it alter on differing road surfaces.

Still think tyres.
Next is rotate front to rear and see.

 

[Mr Pig]

My bet it is the tyres. I had this on a Golf and as soon as I changed the tyres it went away. Try swapping the tyres front to back to see if the noise moves.

 

[martin j.]

If it’sroad surface dependent I too would go with tyres, can you swop sides as well as front rear? Directional relative? Maybe one job then the other to help isolate the problem.

 

[Shadders]

I had this from new on my Mk2 Leon. Turned out the wrong suspension geometry was used out of the factory and caused sawtooth wear on the tyres.
New tyres solved the issue but would have come back if I hadn't had the suspension reset.
I'd get that checked first before changing tyres otherwise the same will happen to those!

 

[TheSwede]

Have PS4S's on my 2018 Cupra R. They are not very quite but fully acceptable. I use to swap front / rear, or if occasionaly I have been on track, left to right side since SE circuits nearly always go clockwise. (This causes much more wear of left front tyre).

On a VW GTI mk6 I owned I had a rear wheel bearing which were worn. This caused a terrible noice. I also thought is was the tyre. I was wrong…
To test it I swaped both rear wheels to my winter wheels then I discovered the problem, still very loud .

/Peter