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Thread: Sub-frame & Diff mount reinforcement kits

  1. #26
    Join Date
    Feb 2005
    Location
    Denver, Colorado
    Posts
    1,922
    My Cars
    MRster / Z4 M4i / X5 M50
    Randy makes and sells the kits.
    2002 M Roadster, Steel Gray Metailic, Gray Nappa Leather, Black Soft Top, Steel Gray Metailic Hard Top, TC Kline Double Adj Shocks with H&R Springs, Stromung Exhaust, SSR Type C Wheels. Looking for a new home.

    2022 Z4 M40i, Misano Blue Metallic, Prem Pkg, Driver Assistance Pkg

    2023 X5 M50, Phytonic Blue, Black Extended Merion Leather, Driving Asst Pro Pkg, Park Asst Pkg, Exec Pkg, Climate Comfort Pkg.

  2. #27
    Join Date
    Apr 2011
    Location
    Sgf, Mo
    Posts
    242
    My Cars
    135i, 1SMC, S54 Roadster
    Yup. Randy's kit is the ONLY way to go. We put one on our roadster 6+ years ago. Its the way it should have been from the Factory IMO.

  3. #28
    Join Date
    Aug 2006
    Location
    Texas
    Posts
    461
    My Cars
    '02 Z3, '09 Mini
    I have a hypothesis (based on looking at realoem.com) that the e30 had a connecting frame rail between the 2 longitudinal rear frame rails, and the diff mount tabs were hung from this. Our rear subframe/diff setup is basically the e30's, however BMW took out the connecting frame rail and just spot welded the diff mount tabs to the sheetmetal trunkfloor. Combined with the soft floppy subframe bushings allowing subframe movement, this was a disaster in the making. Why didn't they keep the frame rail for the diff mount???

    I don't know if the e30 diff mount tabs are any better than ours (those also fail on the Z3), and I don't know if their subframe bushings were firmer than ours, but a big part of the problem would have been solved by making the diff mount onto a proper frame rail as the e30 does. Randy's kit basically does this (and also reinforces the attachment points between the connecting rail and longitudinal rails, and also reinforces the diff mount tabs). I need to look at the e36 compact (which is what our body is based on) and see how their diff mount works...

    Interestingly, the e46 has a different (but similar) structural problem. Their diff mounts onto just the subframe, and the subframe has 4 mount points to the body. But the subframe, rather than mounting onto strong frame rails, attaches to weaker areas which tear apart! I'm assuming eventually BMW learned not to do this sort of thing... ? They tried to make the ride cushier and more isolated with soft bushings, which allow more movement, and yet apparently tried to save weight/cost with weaker structure.... Can't have it both ways.
    Last edited by raubritter; 06-26-2019 at 03:48 PM.

  4. #29
    Join Date
    Jul 2012
    Location
    Henderson, CO
    Posts
    221
    My Cars
    2000 M Roadster
    Quote Originally Posted by CLOWN5HOE View Post
    Where did you buy the kit? I'm unable to find one for sale.
    Got it from the man himself. Drop him a PM. Great guy to work with!


    Sent from my iPhone using Tapatalk

  5. #30
    Join Date
    May 2019
    Location
    SoCal
    Posts
    198
    My Cars
    M3, and M Coupe
    Quote Originally Posted by Pat Gautier View Post
    Got it from the man himself. Drop him a PM. Great guy to work with!


    Sent from my iPhone using Tapatalk

    I PM'd him a couple weeks ago (might have been different forum), but never heard back. Sent email as well. There's some posts saying he may be under the weather at the moment, so I can just sit tight.

  6. #31
    Join Date
    May 2002
    Location
    SW Florida
    Posts
    12,681
    My Cars
    99-01 M Cpe & Rdts, X5M
    Quote Originally Posted by CLOWN5HOE View Post
    I PM'd him a couple weeks ago (might have been different forum), but never heard back. Sent email as well. There's some posts saying he may be under the weather at the moment, so I can just sit tight.
    PM answered.

    Thanks Ken, for having my back!

    I'm still a work in progress; heart cath tomorrow (rather go for a root canal...)

  7. #32
    Join Date
    Feb 2012
    Location
    UK
    Posts
    1,847
    My Cars
    1998 Z3 1.9 5 speed
    Quote Originally Posted by Randy Forbes View Post

    I'm still a work in progress; heart cath tomorrow (rather go for a root canal...)
    Best wishes for that, Randy.

  8. #33
    Join Date
    Feb 2005
    Location
    Denver, Colorado
    Posts
    1,922
    My Cars
    MRster / Z4 M4i / X5 M50
    I'm sure you will be back to normal in no time.
    2002 M Roadster, Steel Gray Metailic, Gray Nappa Leather, Black Soft Top, Steel Gray Metailic Hard Top, TC Kline Double Adj Shocks with H&R Springs, Stromung Exhaust, SSR Type C Wheels. Looking for a new home.

    2022 Z4 M40i, Misano Blue Metallic, Prem Pkg, Driver Assistance Pkg

    2023 X5 M50, Phytonic Blue, Black Extended Merion Leather, Driving Asst Pro Pkg, Park Asst Pkg, Exec Pkg, Climate Comfort Pkg.

  9. #34
    Join Date
    Sep 2019
    Location
    CA
    Posts
    9
    My Cars
    2018 Prius
    Emailed with RF. Considering purchasing a M Coupe found by a great guy locally in the M Coupe Buyers guide. Randy was hours away from surgery and still responded with the price of the kit. What a great guy. Both Randy and seller. The kit is around $610.00 shipped according to Randy. We will see how the PPI goes at a local shop. Wish me luck with the potential purchase.

    https://www.mcoupebuyersguide.com/li...istingID=19513

  10. #35
    Join Date
    Nov 2011
    Location
    Indianapolis Indiana
    Posts
    2
    My Cars
    2000 M3 Roadster

    Shop

    Quote Originally Posted by zielritter View Post
    I'm going to pay this to have it done at my local shop. I have a place that I trust in Cincinnati and is specialized for German cars. I know it's not a cheap kit or install which is why I'm stashing away cash for it. I'm probably going to do subframe and RTAB bushings at the same time.

    Sent from my SM-G892A using Tapatalk

    Hey Zielritter
    what shop in Cindy were you referring to and did you get the work done?

    Thanks

    - - - Updated - - -


    Hey Zielritter
    what shop in Cindy were you referring to and did you get the work done?

  11. #36
    Join Date
    May 2002
    Location
    SW Florida
    Posts
    12,681
    My Cars
    99-01 M Cpe & Rdts, X5M
    Quote Originally Posted by chaslee08 View Post
    Hey Zielritter
    what shop in Cindy were you referring to and did you get the work done?

    Thanks

    - - - Updated - - -


    Hey Zielritter
    what shop in Cindy were you referring to and did you get the work done?
    You landed on a thread that's been inactive >3 yrs, but maybe I can help; I have this shop on my list, so it would be a good place to start looking.

    Mworks Garage
    622 North Bay Ct
    Cincinnati, Ohio 45238
    Brian @ mworksgarage@gmail.com

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