Whine on acceleration?

[samg1988]

On the way back from a drift day yesterday, my mx5 started to whine. A sound similar to a supercharger, in that it gets higher pitched the further up the revs you go.

- It's happening in all gears, loudest being 5th at 70mph.
- It only happens when you accelerate. Coasting / slowing down gives no sound.
- The diff is welded, and the gearbox/clutch were replaced about a month ago with no issues since. Gearbox was second hand.
- Aside from the noise, the car seems to run fine.

Just wondering if anyone has an idea what might be wrong?

[Buff Mchugelarge]

In order of popping in to my head..

Diff/ gearbox
Over tightened belt
bearings (wheel/ crank/ cam)
breaks binding (unlikely I know, but hey)


Mine whines a little and its not got any worse and doesn't seem to have any affect on the car as a whole. If it's only just started after a drift day I'd be looking at diff/ suspension bits?

[devnull]

Can only be the diff. Poor thing.

[MX-5 Lazza]

Does the pitch of the wine change with road speed or with engine speed?

[HaylingJag]

Mine whines all the time under acceleration, mainly coming from the passenger seat

Does sound like the diff in this case

D

[MX-5 Lazza]

HaylingJag said:

Does sound like the diff in this case

Not so sure as OP says:

samg1988 said:

...it gets higher pitched the further up the revs you go...

and

samg1988 said:

...It's happening in all gears, loudest being 5th at 70mph...

Which reads to me like it's engine speed related and not road speed related. If it was the dif, drive-shaft, wheel bearing then it would be road speed related. Engine speed related would be gearbox, clutch, engine.

[HaylingJag]

does it whine when revving stationary? If not you can eliminate the engine.

D