Do I vibe?

[GranTurismoEra]

 

[JonnyG]

......... I'm in France and the XPower is being withdrawn from sale here this year. The reason given is that they lost the eco grant because no part of the car is made in Europe............

Is that all MG cars ? or just the Xpower ?

 

[Chrisdriving]

Ok i raised my tyre pressures to 40psi at weekend , tried car tonight and if there is anything going on between 65 and 75 i could not feel it.

 

[Bricktop X PWR]

Ok i raised my tyre pressures to 40psi at weekend , tried car tonight and if there is anything going on between 65 and 75 i could not feel it.

Spot on Chris!

It really is a thing.

There has been loads written on the why's and how's and it did make my vibes better, but not enough to stop them altogether sadly.

X Power Vibes Fix?

Right! That got your attention! Ignore your dashboard Tyre Pressure readings and get yourself a Tyre Pressure gauge that you can trust. Pump your tyres up to 40 psi (from cold) and go for a drive. You should notice a difference? I got the idea from @DougC when I saw his Tyre pressures on...

www.mgevs.com

 

[salty]

Ok i raised my tyre pressures to 40psi at weekend , tried car tonight and if there is anything going on between 65 and 75 i could not feel it.

Similar experience to me, Chris. ??

 

[Ian Key]

As increasing the tyre pressure seems to lessen the vibrations for some cars has anyone tried just increasing either the front or rear tyres?

My theory is as the wheels spin faster the diameter of the tyre increases and the air pressure in the tyre affects the amount the tyre is allowed to increase in diameter and change the final drive ratio. If the vibrations are caused by an imbalance between the front and rear motors this might reduce the problem.

Waits to be shot down in flames ?

 

[tsedge]

As increasing the tyre pressure seems to lessen the vibrations for some cars has anyone tried just increasing either the front or rear tyres?

My theory is as the wheels spin faster the diameter of the tyre increases and the air pressure in the tyre effects the amount the tyre is allowed to increase in diameter and change the final drive ratio. If the vibrations are caused by an imbalance between the front and rear motors this might reduce the problem.

Waits to be shot down in flames ?

It is surely worth a try.

 

[Bricktop X PWR]

Shot down in flames @Ian Key ?

Nooooo.

How about Exalted Triumphantly!

Well, if it works obviously!

I came up with the 40psi 'fix' after driving @Doug C 's Volcano X Power.

When I checked his TPMS screen they were at 40psi.

The tyres were stock but his car had zero vibes.

His car was made just a couple of months after mine in June last year which is mad, as there are cars made later than that, that do have the vibes.

I haven't thought of running it across just the one axle though.

I will do it this week just to see.

Might as well rule something else out........or............

 

[OriginalBigAl]

As increasing the tyre pressure seems to lessen the vibrations for some cars has anyone tried just increasing either the front or rear tyres?

My theory is as the wheels spin faster the diameter of the tyre increases and the air pressure in the tyre affects the amount the tyre is allowed to increase in diameter and change the final drive ratio. If the vibrations are caused by an imbalance between the front and rear motors this might reduce the problem.

Waits to be shot down in flames ?

Not posted for similar reasons of ridicule, I've been thinking along the same lines, If the rear tyres are at a lower pressure then that motor has to do more work, the front motor has to do less work if the tyres are at a higher pressure so evening out a bit the differing torque values of each motor. ( again ,just a theory ) agree with the final drive ratio also.
An enterprising owner could try it, costs nothing apart from a bit of time . ???? might even decrease those 0 - 60 times, bigger contact patch for the bigger motor. ?

 

[powerfulx]

Rides terrible with tyres pumped that high, harsh ride, less grip. Deadly in the wet. Not sure how understeer in a windy wet road would go. Thats a compromise and not a fix.

 

[salty]

Rides terrible with tyres pumped that high, harsh ride, less grip. Deadly in the wet. Not sure how understeer in a windy wet road would go. Thats a compromise and not a fix.

Fair enough. But I find mine's ok. Not supposed to be a fix, just a help. ??

 

[Bricktop X PWR]

Not posted for similar reasons of ridicule, I've been thinking along the same lines, If the rear tyres are at a lower pressure then that motor has to do more work, the front motor has to do less work if the tyres are at a higher pressure so evening out a bit the differing torque values of each motor. ( again ,just a theory ) agree with the final drive ratio also.
An enterprising owner could try it, costs nothing apart from a bit of time . ???? might even decrease those 0 - 60 times, bigger contact patch for the bigger motor. ?

The vibes are there regardless.

Rear motor only=Vibes.

Both motors also equals Vibes.

Mode selected also equals zero difference in my case.

On the power or off the power.

In neutral and coasting? No difference.

No rhyme nor reason.

Bad some days, more mild on others.

On one particular stretch of road that I use constantly, the vibes are.......variable.

Why?

Temperature, pressure, speed, wind direction, wifes mood, maccy d's consumed (or not) time of day, condition of road, condition of tyres, make of rubber, are they balanced correctly, driveshaft position, rotating components quality, (including manufacturer and balance) yada, yada, Yadaaaaa.


I'll run 37 rear, 40 front, for a week, then change over but........

I'm only expecting the vibes to get worse as a result.

Its only the running of them at 40psi, which got me to a stage where I could cope with it, and just bide my time til the official repair was done.

And we all know what became of that!

MG came up with idea that the position of rotating components were a thing, hence different mounting brackets cited as a repair.

Briefly.

 

[OriginalBigAl]

Rides terrible with tyres pumped that high, harsh ride, less grip. Deadly in the wet. Not sure how understeer in a windy wet road would go. Thats a compromise and not a fix.

Its not meant to be a fix, that is MGs prerogative , legally and morally. It is trying to isolate what the problem actually is and then seeing if things get better/worse or change the dynamics. The only option an owner has is to play around with tyre pressures or alter tyre sizes??? one is cheap the other is not and could lead to warranty disputes. My own car ( non X power ) I have found responds to changes in tyre pressures quite well even over a short range of variations and that it rides better at around 3-4 pounds over MGs recommendations and is more sluggish when its just down on those same values. So playing with the pressures do change the dynamics and the car does react and responds to them. Any information that can be found from these changes then needs to be analysed and chewed over to try to form some sort of conclusion ( right or wrong ) which could be used in any dispute with MG.
Information is king, I am sure MG know exactly what the problem is but are keeping it well gagged because the fix is not in their financial interests, one day the truth will out.

 

[OriginalBigAl]

The vibes are there regardless.

Rear motor only=Vibes.

Both motors also equals Vibes.

Mode selected also equals zero difference in my case.

On the power or off the power.

In neutral and coasting? No difference.

No rhyme nor reason.

Bad some days, more mild on others.

On one particular stretch of road that I use constantly, the vibes are.......variable.

Why?

Temperature, pressure, speed, wind direction, wifes mood, maccy d's consumed (or not) time of day, condition of road, condition of tyres, make of rubber, are they balanced correctly, driveshaft position, rotating components quality, (including manufacturer and balance) yada, yada, Yadaaaaa.


I'll run 37 rear, 40 front, for a week, then change over but........

I'm only expecting the vibes to get worse as a result.

Its only the running of them at 40psi, which got me to a stage where I could cope with it, and just bide my time til the official repair was done.

And we all know what became of that!

MG came up with idea that the position of rotating components were a thing, hence different mounting brackets cited as a repair.

Briefly.

If the vibes get worse as a consequence, then in a perverted way , that is result, it is one thing to think about then tick off the list. At least its more than MG are publicly doing . Good Luck.

 

[Bricktop X PWR]

Rides terrible with tyres pumped that high, harsh ride, less grip. Deadly in the wet. Not sure how understeer in a windy wet road would go. Thats a compromise and not a fix.

Up to 41psi is within the normal range according to the door sticker.

You should not be experiencing anything that compromises ride or safety at 40psi.

Granted, I have different rubber, but at 40psi my ride, grip, and handling are excellent.
Wet grip outstanding.
Plenty of opportunity where I live!

 

[craigupnorth]

I wonder if we should create a separate sub forum for those with the vibes …

 

[Bricktop X PWR]

I wonder if we should create a separate sub forum for those with the vibes …

Well I did start this thread a very long time ago (Sept 2023) but folk don't use the search function and start a new thread which then just becomes a mish mash of new threads theory's and fixes.

Nothing is sticky which doesn't help matters!

Thread 'MG4 X Power Vibe/Hum 65 to 75mph' MG4 X Power Vibe/Hum 65 to 75mph

 

[JonnyG]

I wonder if we should create a separate sub forum for those with the vibes …

It would be the busier sub-forum by far (around 80% had it in this poll) ??

POLL : MG4 Xpower Steering Vibration

Make it two … Ok but the poll clearly states "when cruising around 66-70mph" so if anyone votes "No" who hasn't cruised at these speeds then surely they shouldn't have voted ?‍♂️

www.mgevs.com

 

[Bricktop X PWR]

Shot down in flames @Ian Key ?

Nooooo.

How about Exalted Triumphantly!

Well, if it works obviously!

I came up with the 40psi 'fix' after driving @Doug C 's Volcano X Power.

When I checked his TPMS screen they were at 40psi.

The tyres were stock but his car had zero vibes.

His car was made just a couple of months after mine in June last year which is mad, as there are cars made later than that, that do have the vibes.

I haven't thought of running it across just the one axle though.

I will do it this week just to see.

Might as well rule something else out........or............

So very interesting @Iankey, I lowered the rears to 37psi and left the fronts at 40psi.

The vibes are back to their worst!

I always thought in the early days that it was going to be something wrong at the front end.

2nd motor, driveshafts, blah de blah.

Doing this trip again in a few days and will reverse the pressures.

My 'guess' is that with 37 front and 40 rear, they will go back to being bearable.

We will see.

 

[Anon70]

Out of interest have any 2 motor Cyberster owners experienced vibes and if not is this down to tyres, suspension set up, different power output from the motors or something else?