Well I had a look at my car and figured I could make something similar that would do the same job. Not that there appeared to be a lot of excess play in this mount. I can see what the mount is supposed to do and by filling the air gaps the amount of movement will be reduced substanially. I was suprised how small the mount is.
Took about 1.5 hours to make this and TBH I haven't noticed that much difference, The gearstick does appear to move around a little less if anything.
It was made out of a piece of box section steel and mig welded.
Karl.
Hi Karl,
You're likely not noticing much of a difference because what you built does not limit the upward movement of the transmission like our mount does. I'm sure if you take a closer look at our machined part, and how it looks installed, you'll see why that is. :thumbsup:
Nice job on the fabrication, though, we always love to see DIY solutions. It looks like you're most of the way there.
Question. This spacer insert takes the movement out of the rubber mounting by filling the voids with metal, the voids are there to allow movement between joined components without transmitting vibration & movement stresses from one to the other. Take out the ability for the joint to move and the stresses are transmitted directly to the adjoining component which was not designed to take those stresses, component failure can easily result.
When the component in question is the gearbox casing which will cost a small fortune to replace if it cracks, is it worth the risk of fitting this insert ?
Hmm, not convinced by that, stresses in transmission mountings are as a result of the twisting force (torque) from the act of propelling the vehicle along (Newtons 3rd law) I don't see how the electronics can negate this. Take away the ability of the void bush to absorb the force and it will transmit it to the component it is fixed to. This will undoubtably prove catastrophic in the end, probably not today or tomorrow, but eventually the casting will more than likely fracture.
Hi Spares,
My response quoted from Audizine (which was quoted) had to do with the load on the DSG transmission, not the load on the mount or transmission housing. However, they are somewhat related since the DSG calibrations do have torque limits and affect the speed and harshness of shifts.
The transmission mount still deals with the same amount of the torque without the insert there. In fact, the stock metal piece that is removed from the bottom of the mount also limits the upward movement of the transmission. It just allows for a bit more movement, then distributes force on a
smaller portion of the mount than our insert does, putting more stress on the aluminum. (Not that the aluminum casting will break, even if you use it for solid mounting.
All the void does is minimize NVH transfer into the cabin by allowing some movement during load transitions (shifts, throttle transitions, idle fluctuations).
It is designed for comfort. It is not there to keep the mount casting or bellhousing from failing. Those stock parts are actually more than strong enough for solid mounting, even in race conditions. It is an incorrect assumption to think that a DSG or 6-MT transmission's torque limits are above the strength of the transmission bellhousing and mount casting.
Our insert does not negatively impact the life of the transmission or transmission mount, nor does it make it a solid mount by any means. The rubber between the insert and the mount, as well as the rubber piece on the backside of the mount, are both still intact and work to limit NVH transfer into the cabin, but to a slightly lesser degree. Load generated from the drivetrain is still shared by the differential and engine mounts, as well as the transmission mount.
