MG4 X Power Vibe/Hum 65 to 75mph

[Ian Key]

Talking to one of the salesmen at my dealers while waitg for the service department to finish their tea-break and his theory is that it's caused by the steering rack. The weight of the front motor has shifted the weight distribution form 50/50 to being nose heavy and upset the geometry of the rack.

If that's right would putting a concrete slab in the boot stop the vibration?

 

[jamherber]

Talking to one of the salesmen at my dealers while waitg for the service department to finish their tea-break and his theory is that it's caused by the steering rack. The weight of the front motor has shifted the weight distribution form 50/50 to being nose heavy and upset the geometry of the rack.

If that's right would putting a concrete slab in the boot stop the vibration?

I guess this is why he’s in sales and not engineering. All the rack is doing is transmitting the vibration.

 

[Ian Key]

I guess this is why he’s in sales and not engineering. All the rack is doing is transmitting the vibration.

But at least he knows about it which is more than some dealers do.

 

[siteguru]

I suspect he's working from old information ... if it was this then the steering damper should have masked (rather than fixed) the issue - but the damper has been shown to not help/work.

 

[Deleted member 11291]

I thought I would try the 40 psi tyre pressure again, knowing I had a long motorway journey earlier today. Started off in eco mode as mentioned elsewhere and first impression was that things had improved, although still slightly there.
Changed through all the drive modes and still felt the same, however….

I parked up at my destination and returned to the car an hour and a half later. Retraced my route and as soon as I got back on the motorway the vibes were as they normally are!

I realise it all maybe psychological thinking there was an improvement, when there actually wasn't one.
Anyway pressures will be back to normal tomorrow as the low speed ride is impaired over rougher tarmac surfaces in my case, increasing the rattles!

 

[jds686868]

Heh folks, probably/maybe not related in any way, but... I installed 15mm front spacers, the vibration is noticeably worse. When I installed wheel spacers on a Ford XR5 I noticed an increase in steering wheel shimmy. My local wheel alignment guy said it may be caster wobble. The frequency of this was much lower and closer to normal driveshaft wobble. I mentioned early in this thread that I thought the vibration was around 50/60Hz and that seems to be verified - ie Aussie mains 50Hz hum. Grab a DC ceiling fan and spin it by hand (obviously not installed). You can feel that cogging motor "vibration". Seems motor induction related to me, but I am just guessing and not sure that explains the variability of the issue.

 

[XPowervibe]

I have pretty severe vibration in the 62 to 75 mph zone.

The route I'm taking is with the dealer not MG UK.

I bought the car via my business so no consumer law to assist me.

I'm about to give my final ultimation to the dealer.

Then it's a "letter before action" from my solicitor.

I hope the dealership realizes early on that I'm going to be a significant irritation to their business...

 

[powerfulx]

Mmmm after 6 months , out of nowhere MG wants me to come in regarding the issue. Dealer has nothing to do with it, i know as i had direct correspondence from MG. Lets see what magic is in the box this week.

 

[bedsev]

After a week with mine, I'm pretty sure I have it too. It's not enough to bother me, but defo feel something between 60 and 70

 

[Daedalusminos]

Mmmm after 6 months , out of nowhere MG wants me to come in regarding the issue. Dealer has nothing to do with it, i know as i had direct correspondence from MG. Lets see what magic is in the box this week.

It'll probably be on a nice sunny day....

 

[Seaton91]

Mmmm after 6 months , out of nowhere MG wants me to come in regarding the issue. Dealer has nothing to do with it, i know as i had direct correspondence from MG. Lets see what magic is in the box this week.

Oooooya! Well excited to hear about this

 

[Deleted member 11291]

Oooooya! Well excited to hear about this

In my strongest Scouse accent
Calm down, calm down…..

Harry Enfield The Scousers on Make a GIF

_premium

makeagif.com

(Before anyone says anything, I was born in Liverpool)

 

[Bricktop X PWR]

My car's in for its first service next week.

They are keeping it 3 days.

They will be investigating what I've got left of the vibes, fixing my rear camera and updating to R59.

I'm not holding my breath to be honest.

As long as they do back up, anything they undo, and don't leave it dirtier than when I drop it off, I will probably be..... delighted?

Outside temperature reading, gone doolally.

So washing my car and just wiping out the 'shuts' I thought I'd just check under the bonnet seeing as the cars just been worked on and found.......

www.mgevs.com

Outside temperature reading, gone doolally.

Hopefully a quick fix ? It will be interesting to hear what the updates are ? I'll make sure I get the details ?

www.mgevs.com

 

[WibbleWobble]

Mmmm after 6 months , out of nowhere MG wants me to come in regarding the issue. Dealer has nothing to do with it, i know as i had direct correspondence from MG. Lets see what magic is in the box this week.

Let's hope it's the start of a worldwide acceptance by MG that it's a real issue and they have a solution that works. Hmmm, but don't get you hopes up too much everybody.

 

[murf62]

Hi Murf62,

What app did you use to get the frequency/amplitude graphs? I run android but might be able to find something similar.

I used to investigate faults on large electrical machines (a very long time ago) and this reminds me of one case where part of the end winding has a resonant frequency of 100hz (2x mains frequency) and kept shaking themselves apart.

Sorry, only just seen this. It is a free iphone app running on an iphone 15. I'm sure there will be alternatives on the play store. Gives a fairly crude measurement but is good enough to make some assumptions. The result was what I expected as it confirmed what I am feeling/hearing.

‎Vibration analysis

‎The application analyzes the data from the phone's accelerometer and builds a vibration spectrum. This allows the evaluation of not only the strength and frequency of the vibration, but also the speed of rotation of various mechanisms: fans, motors, various rotating components; since the...

apps.apple.com

 

[powerfulx]

Let's hope it's the start of a worldwide acceptance by MG that it's a real issue and they have a solution that works. Hmmm, but don't get you hopes up too much everybody.

Ha, road force balance is all they wanna do lol what to tell me its fine. And we wait. Not even going to entertain that shit.

 

[Kermit]

Sorry, only just seen this. It is a free iphone app running on an iphone 15. I'm sure there will be alternatives on the play store. Gives a fairly crude measurement but is good enough to make some assumptions. The result was what I expected as it confirmed what I am feeling/hearing.

‎Vibration analysis

‎The application analyzes the data from the phone's accelerometer and builds a vibration spectrum. This allows the evaluation of not only the strength and frequency of the vibration, but also the speed of rotation of various mechanisms: fans, motors, various rotating components; since the...

apps.apple.com

No problem, I have a wireless mic that I found I could clip onto the steering wheel and I found an audio spectrum analyser program on the play store that works with it.

I've done one test today at 110kph on cruise control and there is a distinct peak at 43.9Hz which as you pointed out coincides very precisely with 3 times the rotational speed of the wheels.
I also noticed that the vibration seemed to get worse when I was going round bends and was less noticeable on the straight.

Overall it does seem to be a lot less noticeable now the car has a few thousand kilometres on it than it was when we first got it.

 

[seamust1000]

It's August, this is the epitome of the UK Summer, warm weather, holidays abroad, always been seen as the last month of summer, once we get to September...schools go back, nights draw in....soon be Christmas?.

So, where is the fix for us who have the vibration?

MG said it was coming in the summer which is starting to run out. It couldn't be worse for the UK, a vibration at legal driving speed....vibration disappears at illegal driving speed.

My X Power is a little rocket, lovely to drive at 30/40/50....but 60 and above its quite shit for a £36k car.

It was only a quick post to keep things going? but my car will be 1yr old in Oct, if by then there is no fix then I'm going to need to see a solicitor and as we can all do, start to bring it up in the press and media.

The riots may have calmed down by then?

 

[WibbleWobble]

There is a very interesting and very recent post on the German MG Forum concerning our vibration issue.

Mg4 Xpower 2023 Vibrationen ab 95kmh - MG4 Electric Forum

Hallo zusammen. Ich fahre seit Oktober 2023 einen Xpower und habe ihn blind bestellt ohne ihn je gefahren oder in wirklich je gesehen zu haben. Schon bei der Abholung des Autos meine erste Fahrt wohlgemerkt bemerkte ich Vibrationen im gesamten Auto…

www.mg4-forum.de

 

[Bricktop X PWR]

This is the first post of 14 pages from the German site.

Months after I first brought it up on these hallowed pages.

As per @seamust1000 anyone know a good solicitor willing to take on MG.

I always knew we were not alone......


14 April 2024
#1
Hello everyone. I have been driving an Xpower since October 2023 and ordered it blindly without ever having driven it or actually seen it. When I picked up the car - my first drive, mind you - I noticed vibrations throughout the car as soon as I got on the motorway.

I reported this to my mg agent immediately - after the kilometers I had driven, mind you. A month later I had a workshop appointment and thought it was nothing special, they would fix it. MG called and said that my new car, which I had driven 700 km, had a problem with the tires and the tires had to be sent to Bridgestone.

That could take up to half a year... well, what now? I can't drive well without tires... so they suggested that I buy winter tires from them, which they would fit for me free of charge.... 880 euros later, I have my new Continental winter tires on and am supposed to pick up my car. I pick it up and drive onto the motorway, the vibrations are exactly the same as before.

So it's all a waste of time... then the next workshop appointment is months later and there is no repair or anything like that, instead MG says a steering damper needs to be fitted which is not available with an unknown delivery date.

And my summer tyres are still not back from being checked 4 months later... I have now found out from many forums that all xpowers have these vibrations and that there are already people who have fitted this damper and it is exactly the same as before.

So I already know that the third repair by MG will not be successful and is a waste of time. The cause of this vibration must be eliminated and not a damper installed. It is impossible to say where these vibrations are coming from. I can't say it is coming from the front axle or the rear axle... you can feel everything vibrating in your backside.

Not just the steering wheel. I am frustrated and fed up with the fact that I, as a customer who has paid a lot of money, am the guinea pig and am left out in the cold. How could no one have noticed when the car was being developed that the thing vibrated so much.

And the worst thing is that it is most severe when we are driving on the motorway at speeds between 100 and 130 km/h. I am desperate and cannot believe that no one has noticed the problem... I look forward to hearing your feedback