M3 E92 harsh vibration and clunking:Help

[Alexei9012]

Hi guys, I just got my engine and transmission mounts changed to stiffer ones, didnt have any problems or noises with the car before hand. Now when I accelerate between 2000-4000rpm the car has a harsh vibration in the rear and there is a random clunking when I slow down. Think it’s the centre support bearing but not 100% sure. Can anyone help?

[amrazM]

solid transmission mounts create vibrations in that range, what mounts did you install?

[M3SQRD]

I agree. The vibration and clunk you hear are due to stiffer transmission mounts.

[Alexei9012]

I put 034 Motorsport density line mounts in, not as hard as Polly or solid but harder than stock

[BimmerMan33]

Any aftermarket solid rubber engine/transmission mounts on this car always bring out significant vibrations at multiple rpm ranges..
There is a reason why BMW went with liquid filled engine mounts.. liquid absorbs vibrations.. BMW could’ve saved money by going with soft solid rubber but wouldn’t get the desired refinement!

Based on personal experience with Bimmerworld rubber motor mounts, the vibrations do decrease after 1200 miles or so of use but still present. You might want to keep driving for a thousand miles & see if it improves enough..

[Alexei9012]

Alright thank you, I’ll keep doing that already at 300ish miles, if not I’ll switch back to OEM 😂