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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Constant speed vibration
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      02-16-2020, 05:21 AM   #1
spirit3d88
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Constant speed vibration

Hello everyone, I have a problem, when I drive with my car at 120km / h there is a vibration inside the vehicle, I have seen that it is linked to the rpms and when the gear is engaged my car is A / T.

When I take off the gear or reduce to a lower gear and change the number of rpms that vibration is removed.

Is it possible that they are the rubber tacos of the cardan? My car currently has 81,000km

Thank you!
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      02-16-2020, 06:42 AM   #2
floridaorange
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Alignment will likely fix it. Otherwise possible bent rim, but since I had the same issue at that speed and alignment fixed it I'd go that route.
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Originally Posted by GrussGott View Post
Sounds pizzagatey.
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      02-16-2020, 08:11 AM   #3
spirit3d88
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Originally Posted by floridaorange View Post
Alignment will likely fix it. Otherwise possible bent rim, but since I had the same issue at that speed and alignment fixed it I'd go that route.
I have balanced the 4 tires, and everything is correct, it is only when you accelerated the vehicle with the geared gear, if at 120km/h I pass the lever to N the vibration is removed and if I put it back on D it vibrates again it vibrates
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      02-16-2020, 06:30 PM   #4
Luverse
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Quote:
Originally Posted by spirit3d88 View Post
I have balanced the 4 tires, and everything is correct, it is only when you accelerated the vehicle with the geared gear, if at 120km/h I pass the lever to N the vibration is removed and if I put it back on D it vibrates again it vibrates
on running car, you switched to N?
are you sure you not damaging your gearbox?
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      02-17-2020, 12:59 PM   #5
spirit3d88
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Quote:
Originally Posted by Luverse View Post
on running car, you switched to N?
are you sure you not damaging your gearbox?
ECO PRO Mode, it's called motion by inertia, it's the best way to do it safely, the car automatically goes into N mode when you release the throttle
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