There are vibrations occurring at around 80 miles per hour in a BMW 435d with the F32 model.

[jameswright77]

Hello everyone, I have owned the car for approximately one year. Initially, it provided a smooth and seamless driving experience on all motorways and at any speed. However, I have recently noticed vibrations occurring at speeds of 70-80mph on smooth roads and motorways. These vibrations are not felt through the steering wheel, which would typically indicate an unbalanced or buckled wheel. I have already had the wheels checked to ensure they are in proper condition. The vibrations are instead felt through the body of the car, specifically in the seat and passenger seat area. The tracking of the car has been examined and determined to be in good condition. This issue is quite bothersome. I am curious about the level of sensitivity these cars have when it comes to their tyres. Thank you. Are you asking whether having separate tyres on either side of a vehicle is acceptable? Would that result in vibrations? Upon observing a cut on my NSR tyre, I noticed that the area around it appeared slightly deflated. Consequently, I replaced it with a new Goodyear Eagle F1 tyre, while the other side was equipped with a Michelin PS4 tyre. However, the problem still persists. I am currently attempting to determine whether the damaged tyre was the cause of this issue. By not replacing it with another Michelin PS4 tyre, I am investigating if the difference in tyre brands is contributing to the problem on that side.

[n1mrod]

I would suggest that the prop guibo or centre mount are more likely to be worn.

[jameswright77]

The propeller shaft was sent for inspection, and the garage thoroughly examined it for a week. As a car enthusiast, I even participated in the inspection, having performed numerous repairs on my own vehicles in the past. However, we were unable to identify any issues with the propeller shaft. It is worth noting that there have been numerous reports from owners of F32, F80, and F82 models experiencing vibrations around 80mph. These reports have come from both brand new vehicles and those with only 5,000 miles on them. Owners have made multiple visits to BMW in an attempt to resolve the issue, but have been unsuccessful thus far. However, many individuals argue that low-profile run-flat tyres and lowered vehicles are highly sensitive to even the slightest irregularities in tyre shape. In my case, this issue arose approximately four months after purchasing the car. I am contemplating whether the fact that I have a Michelin Pilot Sport 4S tyre on one side and a Goodyear Eagle F1 tyre on the other side of the same axle could be a contributing factor. It is worth noting that the vibrations are primarily felt in the seat rath There appears to be an issue with the rear of the car. Although I have already had the rims inspected, it may be beneficial to reexamine the rear tyre that I have not yet replaced, as it could potentially have a slight deformity. The problem seems to worsen after the car has been driven for some distance, suggesting that something is heating up and exacerbating the issue. This leads me to consider the tyres as the culprit, or as someone has suggested, the possibility of the rear brakes binding.

[Martin_Smith76]

I experienced a comparable velocity-induced vibration that was likewise not perceptible via the steering wheel. Are you sure it is not a wheel that has been deformed or distorted? I have it on my G30. Even after installing new tyres and performing a balance, as well as a more advanced road force balance, two tyre shops failed to notice the issue.

I experienced two wheels on the nearside that were deformed, most likely due to impact with a pothole. I have seen that tyre shops are capable of balancing a wheel that is slightly distorted, and they may claim that everything is in order. However, it is necessary to visually inspect the spinning wheel on the machine in order to detect the distortion, which unfortunately, most of them fail to accomplish.

Out of desperation, I purchased an additional set of wheels and replaced the tyres, which resolved the issue.

[James_Cam00]

Even a securely fastened calliper may initiate in this manner.

[jameswright77]

Would a binding rear brake calliper result in vibrations at high speeds on the motorway? If so, may this perhaps explain why the problem seems to worsen as the voyage progresses, particularly after the vehicle has reached operating temperature?

[shamaspoor]

Indeed, increased speed can lead to the generation of more heat in the disc, resulting in its expansion. This friction-induced expansion is responsible for the vibration. If this issue occurs again, I recommend pulling over to the hard shoulder and gradually coming to a stop by coasting. Then, without touching the rear discs, assess if one is noticeably hotter than the other. If this is the case, you have identified the source of the problem.

[jameswright77]

Thank you. I will conduct a test during the upcoming weekend. I have observed that the vibration can vary in frequency when I make lateral movements, which could potentially indicate a problem with the calliper. Additionally, I have noticed that the issue becomes more pronounced when the car has been driven for a while and is warm. Specifically, after starting the car and driving a short distance, the vibration is minimal when travelling on a dual carriageway. However, if I return to that same dual carriageway after the car has warmed up and covered some distance, the vibration becomes significantly worse.