[skim7x]

So I've decided to upgrade bushings in the rear suspension... I've already decided to get the OEM M3 rear subframe bushings... but can't decide if I want to upgrade the diff bushings.

I definitely want a more solid rear suspension, and I don't mind a little extra noise from upgraded diff bushings, but don't really want a "harsher" ride. Would Delrin or Aluminum diff bushings really make the ride that much harsher? I never track the car, only spirited daily driving.

So to sum it up:
Do Delrin or Aluminum diff bushings greatly increase NVH?
If so, which increases NVH more, Delrin or Aluminum?

Thanks!

[11SEC]

If you're a manual you might as well get the defivfab differential lock down kit. It replaces the diff bushings to aluminum I believe and even adds an extra bushing. It will help you to not snap a halfshaft when launching and remove any wheelhop you may have.

[blisstik]

I've got the Defiv for almost a year now. Solid. If you have an LSD, you will hear slight whine inside the cabin. Well worth the slight NVH. Good luck.

[skim7x]

Yeah I have the Quaife LSD built by VAC... How is the ride roughness in the back? I don't mind a slight whine, but definitely don't want a really rough ride in back...

[robc1976]

DEFIV lockdown kit is awesome....Have had it a long time and love it. I strongly suggest the powerflex yellow bushings over the M3.

[skim7x]

Originally Posted by robc1976

DEFIV lockdown kit is awesome....Have had it a long time and love it. I strongly suggest the powerflex yellow bushings over the M3.

You recommend powerflex yellow bushings over the M3 bushings for the rear subframe bushings? Why is that? How does NVH differ between the M3 bushings and the powerflex yellow bushings? Looks like your car is REALLY heavily modified #becauseracecar ...

[robc1976]

Originally Posted by skim7x

You recommend powerflex yellow bushings over the M3 bushings for the rear subframe bushings? Why is that? How does NVH differ between the M3 bushings and the powerflex yellow bushings? Looks like your car is REALLY heavily modified #becauseracecar ...

lol! Yeah it it's pretty heavily modded. The M3 I had where a noisier and the vibration seemed to travel from side to side more. Powerflex was better feel especially around corners and a less noisy. The other thing is they are WAY easier to install.

[Blaster400]

+1 on DEFIV lockdown kit. I've had it for over a year with no issues. Expect a slight increase in NVH. Perfectly tolerable for me.

[Blaster400]

Originally Posted by robc1976

lol! Yeah it it's pretty heavily modded. The M3 I had where a noisier and the vibration seemed to travel from side to side more. Powerflex was better feel especially around corners and a less noisy. The other thing is they are WAY easier to install.

Listen to Rob and go with Powerflex. M3 subframe bushings combined with Quaife LSD can result in minor unwanted NVH. There are a couple of threads about this specific issue. Ask me how I know.

[skim7x]

Originally Posted by robc1976

lol! Yeah it it's pretty heavily modded. The M3 I had where a noisier and the vibration seemed to travel from side to side more. Powerflex was better feel especially around corners and a less noisy. The other thing is they are WAY easier to install.

Wow, so the powerflex perform better and are actually less noisy than the M3 bushings... Where is everyone buying their powerflex bushings?

[JStang]

Originally Posted by skim7x

Wow, so the powerflex perform better and are actually less noisy than the M3 bushings... Where is everyone buying their powerflex bushings?

I would guess here http://powerflexusa.com/bmwe90e91e92...-pfr5-422.aspx

[robc1976]

Originally Posted by JStang

I would guess here http://powerflexusa.com/bmwe90e91e92...-pfr5-422.aspx

That or biminiam.com (may have spelled that wrong)

[Indo Rider]

Originally Posted by Blaster400

Listen to Rob and go with Powerflex. M3 subframe bushings combined with Quaife LSD can result in minor unwanted NVH. There are a couple of threads about this specific issue. Ask me how I know.

How do you know? link? I have purchased quaife lsd and m3 bushings, but not installed yet...

[Cloud9blue]

Originally Posted by JStang

I would guess here http://powerflexusa.com/bmwe90e91e92...-pfr5-422.aspx

I have the whiteline bushings, exactly the same as these but at 50% of their price for all 4 bushing. Had it since early march of this year, definitely a worthy upgrade if you track the car (no more rear end wiggle under hard acceleration and rapid direction change). But for the crappy roads we have over here, I do feel the road quite a big more than the super soft stock bushings, but as long as you have good shock/spring it is not that big of issue.

http://www.whitelinesuspensionparts....eries+E92+2009

Might do the differential bushings down the line as well since the car has a LSD now.

[Blaster400]

Originally Posted by Indo Rider

How do you know? link? I have purchased quaife lsd and m3 bushings, but not installed yet...

http://www.e90post.com/forums/showthread.php?t=532595

[David1]

I use Whiteline bushings. Same thing as Powerflex and way less money.

[Indo Rider]

Originally Posted by Blaster400

http://www.e90post.com/forums/showthread.php?t=532595

Damn... now I don't know what to do with my m3 bushings I just bought. If the bushings install wasn't such a PITA I'd just go for it, but now I don't know if I should. Is it more of a noise you hear or a vibration you can feel? If it's just noise I think I could deal with it better...

[Blaster400]

Originally Posted by Indo Rider

Damn... now I don't know what to do with my m3 bushings I just bought. If the bushings install wasn't such a PITA I'd just go for it, but now I don't know if I should. Is it more of a noise you hear or a vibration you can feel? If it's just noise I think I could deal with it better...

No vibration and just occasional noises. Drove me crazy until I found out it wasn't caused by some issue. Some have this NVH (with Quaife + M3 subframe bushings) and some don't so I'd just go for it if I were you.