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  1. #1
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    M3 Rear Control Arm Upgrade Question

    I have the front m3 control arm, was wondering if the rears were worth it? Or should I look into rear subframe bushings instead?

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    Worth it would really depend on your goals. To run the full M3 rear, you also need to run M3 rear struts. Companies like KW will give you a kit consisting of e9x non-M fronts and e9x M rears too. Personally, if you've already invested in good coilovers, and aren't tracking your car constantly and looking to shave off 10ths of a second, I wouldn't bother. If you're about to pull the trigger on suspension bits and have the cash, I'd say why not.

    Just for reference, though, my car is on rails and I've never had a better handling car. Including my e46 M3. Here's my setup if you're interested.

    M3 everything, front and rear, minus the rear control arms
    KW Clubsports
    wavetrac LSD
    every bushing made by powerflex
    cobb sway bars
    bimmerworld adjustable endlinks
    akg lower RSMs
    e46 M3 trans mounts
    335is motor mounts
    245f and 275r Falken rt615k
    -2.5* front camber and -1.5 rear.

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by berns Click here to enlarge
    Worth it would really depend on your goals. To run the full M3 rear, you also need to run M3 rear struts. Companies like KW will give you a kit consisting of e9x non-M fronts and e9x M rears too. Personally, if you've already invested in good coilovers, and aren't tracking your car constantly and looking to shave off 10ths of a second, I wouldn't bother. If you're about to pull the trigger on suspension bits and have the cash, I'd say why not.

    Just for reference, though, my car is on rails and I've never had a better handling car. Including my e46 M3. Here's my setup if you're interested.

    M3 everything, front and rear, minus the rear control arms
    KW Clubsports
    wavetrac LSD
    every bushing made by powerflex
    cobb sway bars
    bimmerworld adjustable endlinks
    akg lower RSMs
    e46 M3 trans mounts
    335is motor mounts
    245f and 275r Falken rt615k
    -2.5* front camber and -1.5 rear.
    Thanks for your setup! Got something to compare to now. I was actually thinking of the guide links and wishbones because like you said I don't want to run M3 struts since I already have KW v1s.

  4. #4
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    Click here to enlarge Originally Posted by krazi3azn Click here to enlarge
    I have the front m3 control arm, was wondering if the rears were worth it? Or should I look into rear subframe bushings instead?
    Chassis weakness priority list I would rate addressing subframe bushings ahead of rear arms.
    2010 N54 - DocRace - Motiv - CKI - TCKR - Volk - ER - CSF - Vorsteiner

    Click here to enlarge


    Daily - '11 F02, 22" HR springs+links Click here to enlarge N54

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    You need m3 struts??? Why? I'm having problems with my rear control arm install this very moment on my 135i.
    We are the Borg. You will be assimilated. Resistance is futile.

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    Click here to enlarge Originally Posted by Enfiftyfore Click here to enlarge
    You need m3 struts??? Why? I'm having problems with my rear control arm install this very moment on my 135i.
    M3 shocks have a hole on the bottom and mount to the control arm with a horizontal bolt. E9x/e8x non-M struts have a stud built into the shock body. This goes downward and secures to the arm with a nut.

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    I just want to make sure I am clear on this. If I get these:

    https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

    Then I need to replace my rear shocks?

    07 E90 335i

    I am looking to refresh my control arms, tie rods, and front hubs (think I have a bad bearing) and FCP sells a control arm with will fronts and rears and kits for just front and just rear. Thinking that if I do the fronts, I might as well do the rears too but I don't want to replace the shocks right now.

    Been looking all over to verify this info but I haven't been able to yet.
    @berns @Enfiftyfore

  8. #8
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    Click here to enlarge Originally Posted by ATP Click here to enlarge
    I just want to make sure I am clear on this. If I get these:

    https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

    Then I need to replace my rear shocks?

    07 E90 335i

    I am looking to refresh my control arms, tie rods, and front hubs (think I have a bad bearing) and FCP sells a control arm with will fronts and rears and kits for just front and just rear. Thinking that if I do the fronts, I might as well do the rears too but I don't want to replace the shocks right now.

    Been looking all over to verify this info but I haven't been able to yet.
    @berns @Enfiftyfore
    No, it is not a requirement, however, if you're still running stock shocks, you might as well replace them.
    We are the Borg. You will be assimilated. Resistance is futile.

  9. #9
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    Click here to enlarge Originally Posted by Enfiftyfore Click here to enlarge
    No, it is not a requirement, however, if you're still running stock shocks, you might as well replace them.
    Thanks for the response. I will have to do some additional research then. Any recommendations for a car with the sports suspension? Just a DD, no tracking.

  10. #10
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    Click here to enlarge Originally Posted by ATP Click here to enlarge
    I just want to make sure I am clear on this. If I get these:

    https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr

    Then I need to replace my rear shocks?

    07 E90 335i

    I am looking to refresh my control arms, tie rods, and front hubs (think I have a bad bearing) and FCP sells a control arm with will fronts and rears and kits for just front and just rear. Thinking that if I do the fronts, I might as well do the rears too but I don't want to replace the shocks right now.

    Been looking all over to verify this info but I haven't been able to yet.
    @berns @Enfiftyfore
    This will not have any dictation on whether you're replacing your shocks. If you're running stock suspension, and it's old, mushy and tired, sure, something to address, but not mandatory with this round of upgrades / maintenance. The only reason you'd HAVE to replace your rear shocks at this time was if you were doing M3 rear spring arms as well, because the attachment there is different than e9x/e8x non-M.

  11. #11
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    1 out of 1 members liked this post. Yes Reputation No
    It is an easy swap, Iíve just installed mines... in a ghetto way :-)
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