Announcement

Collapse
No announcement yet.

Best Subframe/Diff Bushing Recs Help

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Best Subframe/Diff Bushing Recs Help

    Hi,

    I am new to the forums, I have a Z3, same rear end as an e30. I autox this car often, thus Ive been through the entire thing, Ireland engineering camber/toe, all necessary reinforcements, TCKline Coils, etc. I am very familiar with the quirks of these cars.

    My problem, I cant find any good information on subframe + diff bushings, the forums are so conflicted. So Ive migrated here, due to friend’s with e30s recs. I know e30 people know their stuff well! I tried using some aluminum subframe ones, huge mistake. So noisy, feels solid, but not the move.

    Anyways, Ive been looking at AKG 75D Poly subframe and differential bushings, I have everything reinforced, so I feel good about the stiffness. Does anyone recommend them and know if the subframe bushings raise the subframe at all? Specifically when installed in the orientation that doesn't do the 12mm rising. I had poly before and it raised it, even when installed in the position that stated it wouldn't raise, perhaps different here? I ask because my camber/toe adjusters are welded at a preferred static setting and I do not want that to change. Any information and guidance is incredibly appreciated, thank you! Attached some pics of the Z3 below!

    link to the bushing set: https://akgmotorsport.com/product/re...-e36-318ti-z3/




    #2
    For a street car, I generally stick with rubber diff bushings to not hear gear whine. I have tried AKG's 85a poly diff bushing in a few cars and it wasn't really noticeable in terms of NVH. As for the subframe bushings, you can probably get away with delrin since they're fixed position, but also going to be harsher over bumps than rubber or the 85a and 95a compounds. For mixed use cars, I like AKGs 85a street subframe bushings, as they're a good balance between performance and comfort. I've used 95a in my old e36 and they worked well too if you need something a bit stiffer without going overboard.

    As for raising the subframe, the bushings you linked to are the stock height bushings, so as long as they're installed with the slightly fatter end on the topside, they should keep the subframe at the factory position and not have to deal with altered alignment or having to space the differential down like the raised bushings.

    Also nice z3, cool color. I think have seen it driving around before.
    Last edited by mtech325; 09-29-2024, 07:06 PM.

    Comment


      #3
      Originally posted by mtech325 View Post
      For a street car, I generally stick with rubber diff bushings to not hear gear whine. I have tried AKG's 85a poly diff bushing in a few cars and it wasn't really noticeable in terms of NVH. As for the subframe bushings, you can probably get away with delrin since they're fixed position, but also going to be harsher over bumps than rubber or the 85a and 95a compounds. For mixed use cars, I like AKGs 85a street subframe bushings, as they're a good balance between performance and comfort. I've used 95a in my old e36 and they worked well too if you need something a bit stiffer without going overboard.

      As for raising the subframe, the bushings you linked to are the stock height bushings, so as long as they're installed with the slightly fatter end on the topside, they should keep the subframe at the factory position and not have to deal with altered alignment or having to space the differential down like the raised bushings.

      Also nice z3, cool color. I think have seen it driving around before.
      Thank you for the reply! Ive had 80A poly before in the rear and felt the subframe shimmy around too much for my liking, however, it def was a better balance between tight and comfort than the OEM rubber. I frequent Hwy 9, 35, and 130 when I don't autoX.

      Comment


        #4
        I was recommended by Ryan C to use AKG rear subframe poly 95a bushing and 75d on control arms. My e30 is going to see more on street than track. I’m waiting on AKG adjustable camber brackets.
        Projects Hartge,Alpina & AC Schnitzer Builds.http://www.r3vlimited.com/board/showthread.php?t=280601
        http://www.r3vlimited.com/board/showthread.php?t=227993
        http://www.r3vlimited.com/board/showthread.php?t=289362

        DSC04926 by Raul Salinas, on FlickrDSC03413 by Raul Salinas, on Flickr

        Comment


          #5
          Originally posted by e30m3s54turbo View Post
          I was recommended by Ryan C to use AKG rear subframe poly 95a bushing and 75d on control arms. My e30 is going to see more on street than track. I’m waiting on AKG adjustable camber brackets.
          Ill look into those durometers too. I liked having a poly in the trailing arms as it did have less deflection, however, I noticed it binded, especially with camber/toe brackets. Perhaps Delrin is different. Thank you!

          Comment


            #6
            Imagine a door with 2 hinges, that is your trailing arm. Now put those hinges on eccentrics, Poly / Delrin will bind. Most manufactures use aluminum as the inner sleeve which gets crushed but 30% of the clamping force (Elongated holes) and people wonder why they slip and come loose.

            Camber & Toe adjustment bushing options (IMO)
            A - Stock
            B - Spherical https://stim.tech/product/e30-rear-t...rical-bearing/

            I haven't seen and AKG bushing fall apart like others.. I use AKG in customer cars when the package calls for it.

            I was up above it, Now I'm down in it ~ Entropy - A Build thread.
            @Zakspeed_US

            Comment

            Working...
            X