Motor Mounts & Trans Mounts for a 6spd E92 (not daily)

[Exclusivs]

Hey guys

Car just hit 40k miles, and considering a CAE shifter. Need advise deciding on a motor mount & trans mount that work well with the addition of a chassis mounted shifter.

More then likely going Bimmerworld Grp N for motor mount.

Trans mounts: have actually no idea. Specifically looking for 6spd guys to chime in here.

Car does not see daily use. That said, I like keeping things more so on the subtle side. Everyone’s threshold for NVH differs, yes. Don’t want to turn the car into a buzzing mess. You get the point.

Thanks!

[tsk94]

95A Revshift tranny mounts worked good for me with the BW motor mounts on my RTD shifter. You may be able to get away with 85A for the trans mounts and the NVH difference between 85 and 95 is night and day.

[DRLane]

I'm on BW motor mounts and 80a trans. It's working just fine. I kinda want to try 95a again as the car doesn't really see the street except for to/from track and it's already insanely loud. But the NVH difference between 80 and 95 is huge. They're fucking loud!

Oh, also using CAE.

[berns]

Originally Posted by DRLane

I'm on BW motor mounts and 80a trans. It's working just fine. I kinda want to try 95a again as the car doesn't really see the street except for to/from track and it's already insanely loud. But the NVH difference between 80 and 95 is huge. They're fucking loud!

Oh, also using CAE.

I'll trade trans mounts with you. the 95 is wild. Though I'm kind of used to it now. But after a 2 hour drive from the track I feel like my asshole just got off the treadmill. Or something.

[DRLane]

Originally Posted by berns

I'll trade trans mounts with you. the 95 is wild. Though I'm kind of used to it now. But after a 2 hour drive from the track I feel like my asshole just got off the treadmill. Or something.

Yeah I've had them before. But I kinda feel like it might be worth going back now that the car is much more track oriented and with CAEA. THE 95s come up for sale often enough given their so extreme. Not sure i want to part ways with the 80s just in case

[Exclusivs]

Appreciate the chime in guys. Very helpful. Safe to say 95 duro is off the table.

Anyone run stock trans mounts / and cae? Or
an upgraded "solid" motor mount, with stock trans mounts? Would that be a detriment? Or happy medium?

[tsk94]

Trans mounts are more critical when using a chassis mounted shifter.

Solid engine and stock trans wouldn't do much good. You'd be better off running OEM of both as the solid engine mounts won't do much to prevent possible misalignment when shifting - the trans mounts really determine that. So I'd suggest going ~80A to start and see how that works for you. You can try OEM, but I don't think it will work good on track..

[Kelse92]

I have a set of Vorshlag motor mounts that aren't made anymore I need to sell. They're hard nylon. I think I have the trans mounts too somewhere if either or both sound interesting.

[DRLane]

Originally Posted by Kelse92

I have a set of Vorshlag motor mounts that aren't made anymore I need to sell. They're hard nylon. I think I have the trans mounts too somewhere if either or both sound interesting.

If he's not, I am But I'll be 2nd in line.

[Exclusivs]

^Go for it. Not doing these anytime soon. Timeline within next couple months.

[fsmtnbiker]

Originally Posted by tsk94

Trans mounts are more critical when using a chassis mounted shifter.

Solid engine and stock trans wouldn't do much good. You'd be better off running OEM of both as the solid engine mounts won't do much to prevent possible misalignment when shifting - the trans mounts really determine that. So I'd suggest going ~80A to start and see how that works for you. You can try OEM, but I don't think it will work good on track..

My experience is that basically all of this is wrong. Sorry.

The motor mounts control 95% of the drivetrain movement. The mass of the engine and the width of the motor mounts mean that they have a much larger influence on where things are at (or constrained to.) Most of the trans mounts available that aren't OEM add a huge amount of NVH with very little benefit in actual control of where the components are. I wouldn't be afraid of running a chassis mounted shifter with upgraded motor mounts and stock trans mounts. A soft poly transmission mount that is well designed might be a small improvement over stock, but with the big asterisk that most aftermarket mounts are not designed well and will fail much sooner than the OEM mounts.

[tsk94]

Originally Posted by fsmtnbiker

My experience is that basically all of this is wrong. Sorry.

The motor mounts control 95% of the drivetrain movement. The mass of the engine and the width of the motor mounts mean that they have a much larger influence on where things are at (or constrained to.) Most of the trans mounts available that aren't OEM add a huge amount of NVH with very little benefit in actual control of where the components are. I wouldn't be afraid of running a chassis mounted shifter with upgraded motor mounts and stock trans mounts. A soft poly transmission mount that is well designed might be a small improvement over stock, but with the big asterisk that most aftermarket mounts are not designed well and will fail much sooner than the OEM mounts.

Good on you.

My experience has aligned with what I explained above based on experimenting with numerous different mount combinations on both this platform and an E36.

If someone else has a different opinion that's fine. Do what you want. Just offering what I've found in my experience.

[leftfootbr8king]

Salt

[Exclusivs]

THIS!!!^
Appreciate your chime in and detailed accountsfsmtnbiker
Since I never asked; are you on BW motor mounts? Or similar? Solid knowledge, thank you for redirecting the original topic.

[fsmtnbiker]

I've had various mounts in both the E36s and E92. The Bimmerworld Group-N mounts seem pretty durable without a huge NVH penalty, and keep the engine well constrained. They're also pretty durable. They're my go-to for anything that isn't exclusively a track car. I personally would not use the Vorshlag mounts (poly or nylon) due to past hardware failures with them. They updated the mount design a while back and that should help, but I have a bit of a sour taste from the failures I experienced.

There are many options out there that are also probably fine but I have no experience with them.

[tsk94]

Originally Posted by leftfootbr8king

Salt

How, exactly?

I've used a chassis mounted shifter on an E92 for 3 years now, in various mount configurations as mentioned in my last post - all with the same BW engine mounts:
- BW engine mounts + stock trans bushings: frequent grinding issues and troubles getting into gear (particularly while downshifting) on track
- BW engine mounts + 80A revshift mounts: 90% of the issues were fixed, with the occasional grind on 4-3 downshifts
- BW engine mounts + 95A revshift mount: never an issue in 15-20 days since switching

Don't you have a DCT anyways, fsmtnbiker? Have you used a chassis mounted shifter on this platform extensively? And if so, with what mounts?

I'm not saying your spiel on engine mounts controlling the major of drivetrain movement is false - frankly I don't know any better then you claim to and haven't researched it extensively. I just know what I've experienced (above), hence what I said. Clearly something is going on though for the shifting issues to disappear when the only variable changed is the trans mounts. Maher at RTD also suggested the same (trans mounts being more critical) when I first had the issues hence why I went stiffer with them vs. engine.

Similar experience with chassis mounted shifter on 2 E36 race cars as well.

[Move Over]

I use 70D Revshift for both (well should say my car came with) and they are ruff, but i like it. You feel every engine trans and diff vibration there is to feel lol. I wouldn't do them again, but since they're in there I'm ok with them for now.

[Mr_Reeves]

For anyone interested, I have a recent video from the Ring here which gives an idea of NVH. https://www.youtube.com/watch?v=GMQQhA3AiHM

I have revshift 80A gearbox mounts with BW Grouppe N engine mounts with an RTD shifter.

If you listen closely you can hear a faint chattering noise on WOT and high RPM. This is the shift linkage rattling as a result of the stiffer gearbox mounts. Now, with a helmet on, it is barely noticeable but you can hear it. I think if I had solid diff bushes and a stripped interior then I wouldn't notice it at all but because I have a stock silencer and full interior, I can hear it.

There is a little bit of vibration when pulling away from standstill but other than that there is no vibration penalty that I can detect.

I wouldn't recommend this setup to anyone not tracking their car though.

[MPower7]

Just purchased a RTD shifter. Would the 70a revahift transmission mounts work with the OEM engine mounts? Car is not daily driven.

[DRLane]

Originally Posted by MPower7

Just purchased a RTD shifter. Would the 70a revahift transmission mounts work with the OEM engine mounts? Car is not daily driven.

You want the inverse. Harder engine mounts > trans if you're going staggered.

[MilehighM3]

If anyone is interested I have a set of revshift 95A green engine mounts lightly used that were removed to upgrade to BW solid mounts. There's matching trans mounts also for E46 if anyone needs them, but those won't fit the E9x. Anyone wants to pick them up or pay shipping they're all yours. As long as you plan to use them and not resell them. I'd like to see them put to good use!