High pitched whine over 60mph

[Chris Bronsdon]

I have an MG4 Trophy, with the rear spoilers.
The car makes a constant high pitched whine at high speed, over about 60mph.

I took it to my local MG garage a few months ago and was told there isn't a fault.
The noise is still there, so it's going back again next week.

Anyone else had the same problem and know the cause and the solution please?

 

[fred12345]

I have an MG4 Trophy, with the rear spoilers.
The car makes a constant high pitched whine at high speed, over about 60mph.

I took it to my local MG garage a few months ago and was told there isn't a fault.
The noise is still there, so it's going back again next week.

Anyone else had the same problem and know the cause and the solution please?

Hi, you posted in ZS section so unlikely to reach as many MG4 owners ...

 

[Coulomb]

you posted in ZS section

Thanks for the alert. I've moved it to the MG4 forum.

Edit: @Chris Bronsdon, you may care to compare your high pitched whine to the vibration reported by some MG4 XPower owners. It's possible that both issues are due to the tyres developing a flat spot from standing still in transport from China, and it may fade to nothing with time:

MG4 X Power Vibe/Hum 65to75mph

From Lampymic in a PM this morning.... Today at 8:24 AM Morning Bricktop1967, Have you noticed any vibration, although vibration might be the wrong word possibly a buzzing sensation when reaching 68+ on the motorway? I really noticed it on Thursday on a quick trip down the M55, wondering if...

www.mgevs.com

Or it might be completely unrelated.

 

[Ferretusmaximus]

I have the same feature (Microsoft-speak - it's not a bug it's a feature). Not too bad in mine and as it happens at exactly 60mph I use it as an audible warning that I'm at the speed limit on rural roads. I imagine it could become irritating over long periods. It appears to be the motor as it always happens at the same speed irrespective of conditions. Does yours change pitch or volume with speed (mine doesn't)?

 

[Coulomb]

Does yours change pitch or volume with speed (mine doesn't)?

Oh. That does sound like it's motor or motor controller related.

It might be the onset of field weakening, though I thought that typically came on at very roughly 60 km/h (under 40 mph). The MG4, being built from the ground up, might have a different motor to earlier models.

If that's the case, then sadly the solution is to get older, or at least get ears that are less sensitive to higher frequencies . Maybe some sound deadening material near the motor might help.