135 Rear Subframe Question with new LSD Being Installed

[BoostedBarrett]

I have an MFactory LSD in route to my house and want to replace my rear subframe bushings. My car is a daily driver that will go to the track 2-3 times a year, and I am running Performance Suspension with Dinan Camber Plates.

I guess I need M3 subframe bushings (Any idea where to get the whole package for a decent price.)

Do I need to replace other mounts for the new differential? IF so please help me know what to order.

thanks

[Traf]

Don't waste your time with M3 subframe bushings, go straight for poly, delrin or aluminum.
As for the differential bushings, poly is nice. Delrin or alum pass too much noise and vibrations.

[BoostedBarrett]

What is the best and easiest to install subframe bushing then?

Also, which poly differential bushing that is Poly should I look at?

[Traf]

Personally i went with Whiteline, subframe and diff.
Subframe being 2 piece they are easy to install. Any 2 piece subframe bushings should be easy enough to install.

[swagon]

Originally Posted by Traf

Don't waste your time with M3 subframe bushings, go straight for poly, delrin or aluminum.
As for the differential bushings, poly is nice. Delrin or alum pass too much noise and vibrations.

Have you had both M3 subframe bushings and those other you mentioned?

[Traf]

Originally Posted by swagon

Have you had both M3 subframe bushings and those other you mentioned?

No, why would i ? The new M2 M3 and M4 don't have subframe bushings, straight bolted to the car, that says a lot.
If i had to do it again, i would go for solid aluminum subframe bushings.

[dojk]

a cost effective option would be the PU items from strong flex.

[hungry r]

I installed Mfactory LSD in December and I used these whiteline bushings from summit
https://www.summitracing.com/int/par...t917/overview/

They were the most economical at the time and whiteline is a brand that is known to produce high quality parts so I got these. I would have gotten M3 ones but I have read many reviews stating that even poly rsfb's noise is negligible which made me comfortable with getting the whiteline. I would have gotten aluminum but they were too expensive and I did not belive that they would be worth the difference

I was reluctant to change diff bushing because it is suppose to introduce more NVH, and I had enough of it from my previous car when I changed the diff bushings to poly.

In the end, I am extremely satisfied with the poly bushings and even more satisfied with the LSD... So much more traction and much more fun to drive. You can definitely feel the car becoming more solid with the bushings

[tsk94]

I agree with Traf. If you're going to do your subframe bushing skip the M3 route and go straight to poly or solid. They'll perform better then M3's and be way easier to install (excluding solid), and really no penalty in NVH.

[Thewind727]

whiteline 2 piece all the way extremely easy to install

[MAMSport]

I am surprised that many of you are using poly bushings. I hate squeaks, and the bushings that came with an ECS sway bar kit are noisy as all creation over winter frost heaves here in MA. Can you really tell me that the poly RTABs aren't noisy after more than a year or so? Did you drill and relieve for zerk fittings to grease them?

My indy took off the front bar to lubricate the bushings (with anti seize), and that worked for just about a year. BTW, mine is a DD through 4 seasons in MA.

[Traf]

I used copious amounts of marine grease, never had a squeak.

[MightyMouseTech]

Originally Posted by MAMSport

I am surprised that many of you are using poly bushings. I hate squeaks, and the bushings that came with an ECS sway bar kit are noisy as all creation over winter frost heaves here in MA. Can you really tell me that the poly RTABs aren't noisy after more than a year or so? Did you drill and relieve for zerk fittings to grease them?

My indy took off the front bar to lubricate the bushings (with anti seize), and that worked for just about a year. BTW, mine is a DD through 4 seasons in MA.

Use a heavy silicone grease. Will work much better than anti seize, which is not a lubricant.

[Ginger_Extract]

Originally Posted by MAMSport

I am surprised that many of you are using poly bushings. I hate squeaks, and the bushings that came with an ECS sway bar kit are noisy as all creation over winter frost heaves here in MA. Can you really tell me that the poly RTABs aren't noisy after more than a year or so? Did you drill and relieve for zerk fittings to grease them?

My indy took off the front bar to lubricate the bushings (with anti seize), and that worked for just about a year. BTW, mine is a DD through 4 seasons in MA.

Subframe bushings =/= RTABS. Solid subframe bushings don't really move, so no squeak. I used Delrin, it's been one of my favorite upgrades on the car.

[titium]

Poly bushes are fine for the subframe as it isn't an articulating joint.

[MAMSport]

Interesting! Learned some things here! Thank you very much!

[dbronnik]

Originally Posted by swagon

Have you had both M3 subframe bushings and those other you mentioned?

I went from OEM 135i -> delrin/aluminum -> 100% aluminum. I wouldn't waste time with M3 or delrin/aluminum and just go for 100% aluminum for all applications as there's no NVH and no other drawback.