Thoughts on the Turner Rear Subframe + Rear Diff Aluminum/Delrin Bushings

[Wizegi///M3]

Has anyone been running these for any length of time? I am trying to avoid Poly given the continued maintenance.

Unsure if I want to deal with solid on a street car, so i am hoping these is the middle ground or NVH and performance.

[tom @ eas]

Originally Posted by Wizegi///M3

Has anyone been running these for any length of time? I am trying to avoid Poly given the continued maintenance.

Unsure if I want to deal with solid on a street car, so i am hoping these is the middle ground or NVH and performance.

What maintenance do you figure you would need with polyurethane?

Either aluminum or poly are suitable for the street.

[Malek@MRF]

There is zero NVH with Solid Subframe bushings and minimal NVH with Delrin differential bushings.

If you are going to go this route, go solid in the sub-frame, otherwise polyurethane is not worth while given the labor involved. The poly bushings are not much stiffer than the M rubber bushings.

[italyix]

Originally Posted by Wizegi///M3

Has anyone been running these for any length of time? I am trying to avoid Poly given the continued maintenance.

Unsure if I want to deal with solid on a street car, so i am hoping these is the middle ground or NVH and performance.

Going on almost two years and no complains. See sig.

[Wizegi///M3]

Originally Posted by tom @ eas

What maintenance do you figure you would need with polyurethane?

Either aluminum or poly are suitable for the street.

Having to lube them due to squeaking.

[Wizegi///M3]

Originally Posted by Malek@MRF

There is zero NVH with Solid Subframe bushings and minimal NVH with Delrin differential bushings.

If you are going to go this route, go solid in the sub-frame, otherwise polyurethane is not worth while given the labor involved. The poly bushings are not much stiffer than the M rubber bushings.

So I can get away with solid on the subframe. Great news. What about the rear diff? I am looking to only take her apart once when I slap the exhaust and suspension on?

Ps
Get my PM about the exhaust?

[tom @ eas]

Originally Posted by Wizegi///M3

Having to lube them due to squeaking.

Subframe bushings don't squeak. Our shop car has been running polyurethane for months.

We have solid ones in the meantime ready for the track car.

[Malek@MRF]

Originally Posted by Wizegi///M3

Having to lube them due to squeaking.

You don't need to lube them or maintain them as often as a poly sway bar bushing, but they do need maintenance, and they will also fail with time.

Originally Posted by Wizegi///M3

So I can get away with solid on the subframe. Great news. What about the rear diff? I am looking to only take her apart once when I slap the exhaust and suspension on?

Ps
Get my PM about the exhaust?

For the differential you can go polyurethane or Delrin. I recommend Delrin, as you will never have to worry about it again. My personal choice is solid Aluminum in the differential as well.

I replied to the PM in regards to the exhaust.

[JEllis]

I have been running mine for little while now. One thing to keep in mind.

-New M3/5 M4/6 and M3 GTS all have solid subframes and beefed up differential mounts. If your willing to own one of these then your willing to go solid on at least the subframe.

I have all aluminum subframe and differential bushings. In short, the car just feels solid now and I can rest easy that my differential bolt will never brake due to flex.

I am one of those guys that actually really loves the sound the differential bushings bring into the car. If you did not know it was the bushings you would think it was just a great engine and tranny sound.

[Wizegi///M3]

Originally Posted by JEllis

I have been running mine for little while now. One thing to keep in mind.

-New M3/5 M4/6 and M3 GTS all have solid subframes and beefed up differential mounts. If your willing to own one of these then your willing to go solid on at least the subframe.

I have all aluminum subframe and differential bushings. In short, the car just feels solid now and I can rest easy that my differential bolt will never brake due to flex.

I am one of those guys that actually really loves the sound the differential bushings bring into the car. If you did not know it was the bushings you would think it was just a great engine and tranny sound.

I ran a full Moton Club Sport setup with GC race everything on my e46 and now trying to bridge the gap between race and street. My e46 made all types of noises, as much as i loved it, it did get tiring after a while.

With my e92 I want it to me solid and only change things once. I LOVE the idea of swamping the bushings out for solid in the NVH is minimal so they will be a maintenance free item.

I am also researching suspensions and thus far the Ohlins setup appeals to me most, again, loose a little comfort on the street, but not all of it. The e46 I had was no compromises. This one will only see a few weekends a year on the track.

I am actually hoping to build an e46 M3 track only car .. that will be like the old one. Solid everything .. no compromises.

[FogCityM3]

Sounds like the solid subframe bushings offer no increased NVH but solid differential bushings do. What is the most prominent impact: noise, vibration, or harshness or all 3? A little noise wouldn't bother me, the other two probably would. thx in advance

[JEllis]

Originally Posted by Wizegi///M3

I ran a full Moton Club Sport setup with GC race everything on my e46 and now trying to bridge the gap between race and street. My e46 made all types of noises, as much as i loved it, it did get tiring after a while.

With my e92 I want it to me solid and only change things once. I LOVE the idea of swamping the bushings out for solid in the NVH is minimal so they will be a maintenance free item.

I am also researching suspensions and thus far the Ohlins setup appeals to me most, again, loose a little comfort on the street, but not all of it. The e46 I had was no compromises. This one will only see a few weekends a year on the track.

I am actually hoping to build an e46 M3 track only car .. that will be like the old one. Solid everything .. no compromises.

I had a Porsche 997S that I took "too far" so I know what you are talking about. I think Moton CS or Ohlins are overkill on a street car that is not going to see a lot of track time (I had Moton CSs on my Porsche). I only say this, not due to the strut itself, but the camber plate options. A lot of the harshness for aftermarket coil overs (especially track oriented brands like Moton or Ohlins) comes from the solid ball camber plates. I really like KW CSs due to their relatively street able spring rates and the rubber enforced camber plates that are a little more street friendly. Or go with Motons with OE camber plates. There might be some streetable camber plate options that I am not aware of.

Plus, once you go coilovers, sway bars, solid tie arm bushings ect... things really get harsh. I would stick with a good set of coilovers, solid subframe/diff and call it a day.

Solid subframe and diff bushings will not effect street ability at all and will not add any harshness. See below.

Originally Posted by FogCityM3

Sounds like the solid subframe bushings offer no increased NVH but solid differential bushings do. What is the most prominent impact: noise, vibration, or harshness or all 3? A little noise wouldn't bother me, the other two probably would. thx in advance

No harshness.... from about 4K on up you will get a sound that is sort of like a mini F1 engine or roots type blower spinning up. My dad used to have a Harley F150 edition truck that had a roots blower on it. It sounds like that to me but not as loud. In fact, if you roll the window down or listen to music, even at a low setting, the NVH gets drowned out. I personally love this sound, the mini F1 sound combined with my GTS exhaust really makes my car feel special when I am driving. Come to think of it, some of you guys with loud exhausts will probably not be able to hear the NVH. I personally think the solid or delrin diff mounts are a must for anyone with a 6MT that "enjoys" driving or tracks.

[Matt Fojtik]

Originally Posted by JEllis

No harshness.... from about 4K on up you will get a sound that is sort of like a mini F1 engine or roots type blower spinning up. My dad used to have a Harley F150 edition truck that had a roots blower on it. It sounds like that to me but not as loud. In fact, if you roll the window down or listen to music, even at a low setting, the NVH gets drowned out. I personally love this sound, the mini F1 sound combined with my GTS exhaust really makes my car feel special when I am driving. Come to think of it, some of you guys with loud exhausts will probably not be able to hear the NVH. I personally think the solid or delrin diff mounts are a must for anyone with a 6MT that "enjoys" driving or tracks.

Was this sound you had with Solid or Delrin mounts?

[smokinjoe64]

Thought I'd add/ share from similar topic posted...

https://www.m3post.com/forums/showpo...4&postcount=20