Urethane trans mounts - increased cabin noise?

[JGood]

Ok so now I read this after buying AGK 75D motor and tranny mounts. haven't put the motor back in but now I know what to expect.

I have those motor and trans mounts in my track car with no interior, I think it feels/sounds fine. I mean yeah, there is some additional vibration, but it's nowhere near unbearable.

Good point about the tranny mounts being the weak link though. I never considered that...

[Kingb]

I just ran into this thread but my car isn't a track car. I will be taking it to the Nuerburg ring and the Hockenheim ring this year but thats it. I'll try it out since I already have them.

[Apex381]

Anybody ever put those steel cups over the e21 mount? Akg sells the steel cups and I already use e21 mounts. Wondering about how effective they are.

[notoriousracing]

Anybody ever put those steel cups over the e21 mount? Akg sells the steel cups and I already use e21 mounts. Wondering about how effective they are.

Get the stiffness of "almost" polyurethane but still have a shear point? This man is onto something?

Awaiting more opinions.

[Emre]

Anybody ever put those steel cups over the e21 mount? Akg sells the steel cups and I already use e21 mounts.

That's what I'm running in my E30 track car. I noticed no increase in cabin noise at all. It's hard to say how much stiffer the E21 mounts are compared to stock E30 mounts because my stock ones were totally blown to crap when I replaced them.

[rThor432]

I never noticed any increased NVH with urethane transmission mounts. That is with no insulation anywhere, just the thin early carpet.

Adding urethane engine mounts adds a little bit of vibration though.

[Please Mitch, say something about my diff. I'm expecting a comment about that.]

[e30polak]

I have poly trans mounts, and 535 motor mounts on my swap car, and the driveline vibration is annoying in my DD. It makes it worse that I have a LTW flywheel, which causes quite a bit of vibration decelerating between 4k-2k. :crazy:

I will be switching out for e21 mounts. I don't track my car, only canyons, and some future dorifto action! :D

[e30_kid89]

I've seen this happen to a friend (the mounting ears breaking off) BUT we came to the conclusion it was because he had solid trans mounts and stock engine mounts.

I think if they're both the same material/harness it should be okay. I guess I'll find out as I'm running the 75D poly motor/trans mounts from AKG. Drove it a couple times and yes its all buzzy and what not but that's expected. I sorta think that's why they sell the mounts together in a set.

[E30 Racer]

The IE tranny mounts will increase NVH in an E30. No question about it. I used them for a few days and could not tolerate them (even in a car that is primarily an auto-xer). Switched to Rogue solid rubber mounts and couldn't be happier.

The IE engine mounts are OK, BTW.