Frequency of motor mount change

[VictorH]

Correction, I just checked, I have over 32,000 miles on these mounts.

[SYT_Shadow]

Originally Posted by VictorH

Perhaps Bimmerworld has changed the composition of the Group N type mount but I've had mine for 3 years and over 20,000 miles. I think any of you would be hard-pressed to detect a difference between these and new stock units.

Yes, when you first install them for the first few thousand miles, particularly the first 500 or so, they seem excessively harsh for a street mount (they are rough at idle, particularly when you engage reverse or first start off and you're at a bit of load at low rpm) but they are perfectly fine now. Idle is perfectly fine at stock idle rpm.

I think these mounts just need some miles and they are fine. If you have doubts call BW and ask them is they have a different supplier or different construction/compound or something else compared to when they first came out, if not they are fine.

interesting

I've had mine around 200 miles. Hopefully they will calm down a bit but I also plan on raising the idle to 1k rpm

BW said they were very surprised of the NVH at idle because they've sold many and don't have complaints. It's possible they have to break in a bit.

[VictorH]

Yeah, not nearly enough. The first few hundred miles are honestly not much fun at all and you'll think you made a big mistake but guaranteed, they will get better.

Also, the S65 had a bit of a harmonic vibration around 1,800 rpm plus minus and going through that range is particularly rough.

[XCUSE_M3]

Factory on a 08 with 80k miles, also did my bearings.

[JsL]

Installed Vibratech Road mounts when I got my bearings done at 61k miles.

Like people said in this thread, you have to be concentrating or looking for added NVH to notice a difference.

There is a slight, and I mean slight, increase through the steering wheel and chassis at idle. It actually makes you feel more connected to the car, you feel if the engine is under too much load or is happily revving.

The time I can tell the difference between the mounts is the 1 sec during start up. The car and steering wheel shakes a bit more during start up and disappears after the engine fires up.

I recommend the Vibratech Mounts, just make sure you buy the road, and not race version.

[leo95se]

40k miles. 8 years on the track, they were melted

[Richbot]

I actually noticed a slight increase in NVH using OEM replacements at idle, which I remember from when the car was new. The squished and melted stock mounts may do a better job of damping out idle vibes at the expense of you know, not holding the engine in place at all

[MidLifeM3]

I replaced motor mounts on my 2008 as matter of course while having rod bearings replaced at 85k miles. They hadn't falled apart yet like xcuse_m3's photo above but had deep cracks and could be noticeably flexed just by hand. Just refreshing with stock mounts cured the driveline windup that was making it hard to shift smoothly (6MT). Based on my prior experience with other cars and hard motor mounts (too much NVH for a primarily-street car IMO, of course acceptable level for NVH depends on your use case and personal preferences/tolerance) I stayed with OEM mounts for my M3. 85k miles on stock mounts seems acceptable to me, I've had some cars which lasted longer and some shorter but the rubber stuff everywhere in the driveline and suspension is generally all shot by around 100k miles. I'm a recent owner of this car and I believe the previous owners drove it pretty gently so durability under extreme conditions I cant attest to.

the rod bearings yes were due to replace. Not so bad as "glad I didn't drive another mile" but worn through the plating on several bearings. Not fear mongering on the rod bearing topic, at close to 100k miles some maintenance needs to be done. the front tension strut rod bushings too, those have finite service life. (mine are now monoballs as part of my same 85k mile refresh)

[slicer]

Originally Posted by SYT_Shadow

interesting

I've had mine around 200 miles. Hopefully they will calm down a bit but I also plan on raising the idle to 1k rpm

BW said they were very surprised of the NVH at idle because they've sold many and don't have complaints. It's possible they have to break in a bit.

I have the BW mounts and have not detected a significant NVH increase. No major vibration at idle. My car is DCT; not sure if that's a factor. That being said, my car is relative loud and more harsh than stock in general. I have upgraded a bunch of the bushings (suspension, sub frame, diff). I upgraded the motor and trans mounts on my former E46 and that resulted in an annoying vibration at idle. My E92 is nowhere near that.

[SYT_Shadow]

Originally Posted by slicer

I have the BW mounts and have not detected a significant NVH increase. No major vibration at idle. My car is DCT; not sure if that's a factor. That being said, my car is relative loud and more harsh than stock in general. I have upgraded a bunch of the bushings (suspension, sub frame, diff). I upgraded the motor and trans mounts on my former E46 and that resulted in an annoying vibration at idle. My E92 is nowhere near that.

I have like 5k on the BW mounts. Other bushings are all stock. Car is also dct.

With time they have broken in nicely

Vibration is hard to notice at idle. Even then, it is very subtle. Not noticeable at all driving.

All in all very happy with it. Will eventually replace the other M's motor mounts to these as well

[admranger]

I have changed my motor mounts with every bearing change so far.

[Exclusivs]

OEM engine mounts are fluid filled? Bit unexpected to say least, and not going to drop front carrier just to do engine mounts.

[pbonsalb]

Yes fluid filled. When they get bad enough you will change them. A few people have suffered broken mounts. I changed mine when I did the rod bearings; nit sure if you can do them without at least lowering the subframe a bit — it may not need to be completely unbolted but you will want an engine support bar up top or maybe a hoist holding up the engine.

[Exclusivs]

Originally Posted by pbonsalb

Yes fluid filled. When they get bad enough you will change them. A few people have suffered broken mounts. I changed mine when I did the rod bearings; nit sure if you can do them without at least lowering the subframe a bit — it may not need to be completely unbolted but you will want an engine support bar up top or maybe a hoist holding up the engine.

Not sure if you can see in first photo - mount has fluid residual. Knew this was an area to address (usually of course when doing rods) - but @ 29k miles... If it truly is leaking fluid IE:done, this is certainly an unexpected surprise.

[MPower7]

Originally Posted by Richbot

I actually noticed a slight increase in NVH using OEM replacements at idle, which I remember from when the car was new. The squished and melted stock mounts may do a better job of damping out idle vibes at the expense of you know, not holding the engine in place at all

Same here and smoother shifting. 6MT.

[WarrantyTracker]

I have a good friend who tracks his E92 M3 around 15 or 20 days a year, going hard on R comps. Five summers of that and about 40k miles total with no symptoms yet. But if he decides to do the rod bearings, he will put in new mounts.