Weird noise on acceleration

[jakesmith]

Got an Evoque 2.2 Diesel Auto

Just noticed today (on way to a family camping trip over 100 miles from home) that the car is making a quiet but noticeable new noise only on hard acceleration over around 3000rpm. Easily avoided at present by driving more sedately. It is engine speed dependant not road speed, and only happens in gear not neutral. It is not a high pitched sound like turbo whistle, but lower than that and rises in tone with revs. Noticeable in 3rd and 4th gears less so 2nd and wasn’t going fast enough to test 5th or 6th.

Any ideas what it may be so I can brace myself.

[swampy442]

Leaking/split boost hose would be my guess

[jakesmith]

THanks... was hoping something like that but no, just heard from the garage and it's the rear diff - £840 inc VAT fitted... not too terrible for an 8 year old car with 70k on I guess

[Scrump]

Price sounds very reasonable for that.
Are you sure that is your issue though as you initially said it was engine speed dependant not road speed?

[stevieturbo]

jakesmith said:

THanks... was hoping something like that but no, just heard from the garage and it's the rear diff - £840 inc VAT fitted... not too terrible for an 8 year old car with 70k on I guess

A diff should last the life of the vehicle....that's pretty terrible.

The price doesn't seem so bad, depending what they're actually quoting for. Presumably a second hand unit ?

[jakesmith]

stevieturbo said:

jakesmith said:

THanks... was hoping something like that but no, just heard from the garage and it's the rear diff - £840 inc VAT fitted... not too terrible for an 8 year old car with 70k on I guess

A diff should last the life of the vehicle....that's pretty terrible.

The price doesn't seem so bad, depending what they're actually quoting for. Presumably a second hand unit ?

Yes I know, but it's a Landrover vehicle so I had low expectations & pretty amazing that apart from the tailgate and an ABS sensor, these are the only faults in 8 years!
The place doing the work is a specialist transmission place and he has said these failing is common as muck, also that the BMW XDrive units are coming in on 35,000 miles!!
They put it up on the ramp & spun it up & confirmed 100% it was the rear diff so must have been my mistake before thinking it was rev dependant - must have been because my road speed increased with revs I guess.

[PositronicRay]

I know it's a different vehicle, and different tech, but my 20 year old merc had a diff whine.

I changed the oil, no difference. Then again 6 months later, because I'd convinced myself that I used the wrong grade and had a long trip coming up. No difference, so just resolved to live with it.

6 yrs later the whines gone, not sure when or where, just a gradual thing I guess.