[HeavyMetalRocker]

Okay, so I'm getting an rpm relevant vibration that is subtle enough to not really affect the steering wheel. However, it is audibly loud enough to be heard over my HPF exhaust. I've isolated the problem to be coming from the front passenger side. I've also taken steps to determine it is not a tire issue. Has anyone experienced this or have any idea where I should start?

[bolty]

wheel bearing.

[JamesM3M5]

These wheel bearings last a long time. Unlikey it's a bearing unless the corner has been in an accident.

If it is RPM related, I'd replace the motor mounts. The 335is/1M passenger side motor mount is sturdier than the regular one.

If it is speed related, it is a bad thrust arm bushing and/or other worn suspension components. The thrust arm bushings are the #1 cause on this style of suspension. I'd upgrade to the M3 bushing or if the car has over 60k miles, swap the whole arm with M3 bushing. Do both sides. Replace the hardware - it is steel but one-time torque to yield bolts. Torque the bolt with the suspension at loaded ride height only. Procedures should be in the Bentley manual, or count on about $600-800 for a shop to do the M3 arms complete with alignment.

[Jeff@TopGearSolutions]

Originally Posted by JamesM3M5

These wheel bearings last a long time. Unlikey it's a bearing unless the corner has been in an accident.

If it is RPM related, I'd replace the motor mounts. The 335is/1M passenger side motor mount is sturdier than the regular one.

If it is speed related, it is a bad thrust arm bushing and/or other worn suspension components. The thrust arm bushings are the #1 cause on this style of suspension. I'd upgrade to the M3 bushing or if the car has over 60k miles, swap the whole arm with M3 bushing. Do both sides. Replace the hardware - it is steel but one-time torque to yield bolts. Torque the bolt with the suspension at loaded ride height only. Procedures should be in the Bentley manual, or count on about $600-800 for a shop to do the M3 arms complete with alignment.