[tetsuo111]

Documenting a small (trivial) mod.

Bushings are on order to firm-up the drivetrain. I'm doing this the hard way. Again. If I was smart, I would surrender and go full track mode with very low compliance (or solid) drivetrain bushings. Or, I would simply sleep peacefully knowing that the stock drivetrain bushings are adequate for a DD, keeping the NVH in check for a comfortable ride.

Instead, I'm working to reduce drivetrain compliance, while keeping the car street-able.

On my last E91, Delrin differential bushings were effective, but also amplified the differential whine too much for the pax in my life. 034 Motorsports motor mounts were a mild improvement over stock, and there was no NVH penalty. I fabricated 60A poly transfer case mounts, but the car was lost before those were installed.

To prep for firmer trans mounts, I installed a foam gearshift assembly insert, to mitigate noise in the cockpit. The insert is part of the M and 335i gearshift assembly, but not on our little 328i.

BMW 25117567319 (#4 in the diagram)

Results pending after installation of the firmer trans bushings.