Revshift 80A Motor Mount Review, 80A transmission mount review
- Thread starter matreyia
- Start date
I have a 3M filled driver side mount and RevShift 80a passenger mount inspired by this thread. The combo is wonderfull. Only noticeable increased NVH is when I bog a launch in traffic .
I have an MT. idles at 900. Twins disk clutch.
I am also running Revshift 80A motor mounts. They aren't too bad at 900 idle with DCT. The car sometimes 'bogs down' randomly and vibrates the entire car but the connected feeling when applying power is worth it. A walnut blast certainly helped my idling variability.
The transmission mounts had to be swapped though; running RE mounts. https://bmw.spoolstreet.com/threads...80a-transmission-mount-review.4616/post-67189
The transmission mounts had to be swapped though; running RE mounts. https://bmw.spoolstreet.com/threads...80a-transmission-mount-review.4616/post-67189
Any concern with the 3M (pu?) Separating from The rubber? I know that's a no-no in the RSFB/susp bushes.
Poly filling bushings does work but lifespan is short. It's guaranteed to crack and separate over time. You still get some benefit since space is being taken up, but, not as much over time. It's worth the money to just buy a proper product like revshift, akg, or turner.
Didn't realize AKG had a reasonable solution for this ... nice to know. The whole notion of running polyurethane on most things is a miss, IMHO. I love the countless stories of people doing this with trans mounts and diff/subframe muonts ... I digress.
Filippo
I would only use filled mounts on driver side since stress is minimal on that side. I would never use this for bushings of any kind.
yeah I've tried it on this car and others and it works but just doesn't hold up long at all. Not worth the effort long-term.
Just wanted to add my experience with the revshift motor mounts as well.
In short I am now using black poly mounts on the passenger's side of both the engine and dct, and like it alot.
Car: E89 Z4 N54 DCT with M4 flywheel
The long version: I installed both mounts using the black poly first, and was immediately turned off by the massive vibration noise. At normal idle the setup generated a loud deep bass sound throughout the cabin. Intolerable. At 950rpm idle it would disappear, but in reality you would probably need to run 1000rpm idle to make sure the revs would never dip into the resonance area. Alright then, this setup was not for me.
We swapped the driver's side OEM mount back in, and I ended up setting idle at 900rpm. I have driven the car like this for a few hundred km's, and I love the feel. The car is more direct everywhere, and the NVH is tolerable. This makes me curious as to how the car would feel with the green poly, or even a combination of black and green poly on the same mount (I have both).
Inspired by this success, I decided to give my old UCC black transmission mounts another try. When I first installed these with cups I hated the NVH. I could hear all sorts of weird DCT noises, and the noisy M4 flywheel didn't make it any better. Any normal passenger would think the car was broken when hearing that noise. The only thing I liked about them was that the car sounded like a racecar when revved at idle.
Today we did the same trick as with the engine mounts - we only mounted the passenger's side poly mount, and kept the driver's side stock. Bam! No weird DCT noises this time. The M4 flywheel noise is audible earlier than before but that is the only downside. As before you mainly hear the flywheel when loading the car in high gears at low rpm. The noise wont ever happen if you use DCT S mode. There was also a very slight tranmission whine right after installing the mount, but that dissappeared when the transmission oil got hot. Or perhaps the poly mount just settled in a bit. Next cold start will show.
Anyway pretty happy with this mixed setup so far! More point and shoot wiithout too much NVH.
In short I am now using black poly mounts on the passenger's side of both the engine and dct, and like it alot.
Car: E89 Z4 N54 DCT with M4 flywheel
The long version: I installed both mounts using the black poly first, and was immediately turned off by the massive vibration noise. At normal idle the setup generated a loud deep bass sound throughout the cabin. Intolerable. At 950rpm idle it would disappear, but in reality you would probably need to run 1000rpm idle to make sure the revs would never dip into the resonance area. Alright then, this setup was not for me.
We swapped the driver's side OEM mount back in, and I ended up setting idle at 900rpm. I have driven the car like this for a few hundred km's, and I love the feel. The car is more direct everywhere, and the NVH is tolerable. This makes me curious as to how the car would feel with the green poly, or even a combination of black and green poly on the same mount (I have both).
Inspired by this success, I decided to give my old UCC black transmission mounts another try. When I first installed these with cups I hated the NVH. I could hear all sorts of weird DCT noises, and the noisy M4 flywheel didn't make it any better. Any normal passenger would think the car was broken when hearing that noise. The only thing I liked about them was that the car sounded like a racecar when revved at idle.
Today we did the same trick as with the engine mounts - we only mounted the passenger's side poly mount, and kept the driver's side stock. Bam! No weird DCT noises this time. The M4 flywheel noise is audible earlier than before but that is the only downside. As before you mainly hear the flywheel when loading the car in high gears at low rpm. The noise wont ever happen if you use DCT S mode. There was also a very slight tranmission whine right after installing the mount, but that dissappeared when the transmission oil got hot. Or perhaps the poly mount just settled in a bit. Next cold start will show.
Anyway pretty happy with this mixed setup so far! More point and shoot wiithout too much NVH.
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I have the green 95 mounts. they work great. I couldn't really comment on NHV from just these. My interior is mostly gutted and it's ridiculously loud all the time.
Wow! I was not expecting such a review. I have the black poly mounts driver/passenger and they are brutal. Idle is 950 and is mostly mitigated with that high idle... You give me some thought on the driver's side being OEM; which is the cheap side to purchase new. Hmmm
Thanks for the update!
I have UCC blacks with enforcer cups and I barely even noticed a difference in NVH, and I was looking for it too. I did start hearing the slight clunking of the DMFW however. I eventually want to get a pair of these and have perfectly matched engine and trans mounts.
Do you mean in height or firmness? I don't recall either changing on my set up over time.
I've run 80a's up front, and big rubber trans mounts (Rogue Engineering is the only company that makes those) with AKG aluminum cups. I'm still at stock idle on an MT and frankly the bit of vibration at idle, which is not always present, is such a minor thing I've been too lazy to bump the idle. Honestly I probably won't bump it at all.
It is interesting the varying opinions from experience. I suspect it is the intersection of one person's perception versus another X different car configurations X no two cars are exactly alike (e.g. engine reciprocating assembly).
That said I think the RE trans bushings are a home run and provide more margin of NVH than any poly, while providing all the stiffness one would care about in the trans mount. Aluminum cups are just insurance on those big mounts, IMHO.
Filippo
It is interesting the varying opinions from experience. I suspect it is the intersection of one person's perception versus another X different car configurations X no two cars are exactly alike (e.g. engine reciprocating assembly).
That said I think the RE trans bushings are a home run and provide more margin of NVH than any poly, while providing all the stiffness one would care about in the trans mount. Aluminum cups are just insurance on those big mounts, IMHO.
Filippo
I have my Rev Shift motor mounts for sale if anyone is interested. They are the green track versions.
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