2011 Q7 TDi humming noise/vibration over 70 mph

[Turbodiesel1976]

Hi Folks, wondering if anyone can help me troubleshoot - basically between 71-75 mph I'm getting a noticeable humming noise and vibration through the pedals & steering wheel, only when under drive, nothing when coasting off the throttle. Seems to be coming from the front right. I had the front wheels re-balanced without success. If anyone can throw any light on what it might be please let me know, cheers

[Yertis]

I'd start by looking at the tyres. I once spent a fortune on CV joints etc for a quattro in these circumstances. Changed the front tyres, vibration instantly vanished.

[Turbodiesel1976]

Yertis said:

I'd start by looking at the tyres. I once spent a fortune on CV joints etc for a quattro in these circumstances. Changed the front tyres, vibration instantly vanished.

Cheers for the reply, this started happening around about the time I put 2 new Pirelli P-Zero tyres on the front, I thought they were exactly the same as the ones they replaced but I just noticed they have a slightly different tread pattern, damn. I was thinking along the lines of CV joint or drive shaft as the vibration only happens when on the throttle, please don't tell me I need to spend another £440 replacing the new tyres

[PositronicRay]

Turbodiesel1976 said:

Yertis said:

I'd start by looking at the tyres. I once spent a fortune on CV joints etc for a quattro in these circumstances. Changed the front tyres, vibration instantly vanished.

Cheers for the reply, this started happening around about the time I put 2 new Pirelli P-Zero tyres on the front, I thought they were exactly the same as the ones they replaced but I just noticed they have a slightly different tread pattern, damn. I was thinking along the lines of CV joint or drive shaft as the vibration only happens when on the throttle, please don't tell me I need to spend another £440 replacing the new tyres

Are they staggered? Swap em to the back.

[Turbodiesel1976]

PositronicRay said:

Are they staggered? Swap em to the back.

How can I tell if they're staggered? (Soz I'm a tyre ignoramus) I'd be willing to try a swap

[PositronicRay]

Turbodiesel1976 said:

How can I tell if they're staggered? (Soz I'm a tyre ignoramus) I'd be willing to try a swap

Staggered just gives different tyres widths.

[Turbodiesel1976]

Nah they're the same front & back, just checked google and it seems I'm not the only person with vibration issues with Pirelli P Zeros. fk

[PositronicRay]

Turbodiesel1976 said:

Nah they're the same front & back, just checked google and it seems I'm not the only person with vibration issues with Pirelli P Zeros. fk

Try a front to back swap. It won't cost anything, will rule out/prove a tyre problem and manufactures recommend best (newest) tyres on the back.

If it is a tyre problem take it back to the supplier/fitter and see what they say.

[Turbodiesel1976]

PositronicRay said:

Try a front to back swap. It won't cost anything, will rule out/prove a tyre problem and manufactures recommend best (newest) tyres on the back.

If it is a tyre problem take it back to the supplier/fitter and see what they say.

Sounds like a plan, will update thread once resolved in case anyone interested, cheers

[NicDale]

I switched to vredestein ultrac vortis, they work really well on the Q7 and the fronts have so lasted 20,000 miles. You can get a pair of them for under £300 in 295/35/21s.

[Turbodiesel1976]

Yertis said:

I'd start by looking at the tyres. I once spent a fortune on CV joints etc for a quattro in these circumstances. Changed the front tyres, vibration instantly vanished.

Spot on diagnosis - 2 new Pirelli P Zero Rossos fitted this morning, car perfect again, cheers!