Subframe reinforcement costs....

Discussion in 'E46 M3 (2001-2006)' started by turboman, Nov 8, 2017.

  1. 8 Nov 2017 at 11:07 PM #1
    turboman

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    Had my newly purchased m3 examined at a BMW specialist today and after a thorough inspection I was relieved that there are no cracks in the subframe

    Having read a little around the issue I've gleaned that it would be wise to have the subframe reinforced as a preventative measure...

    Could you guys please assist me as to how much this costs to do and hat the process entails?...,,once strengthened is the job done once and for all or could it still crack in future?

    I'd be grateful for your experiences and costs involved
     
  2. 8 Nov 2017 at 11:35 PM #2
    DaveMSport

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    Plates with brace will be good once and fir all. With just plates, there's still the possibility of the panel coming detached.

    Ive done my own and another few since and cars even feel a little tighter and less creeks and sqeaks once repaired.


    Dan at Bmp conversions does the whole job for about 1500 i think
     
    Last edited: Nov 8, 2017
  3. 8 Nov 2017 at 11:46 PM #3
    STAATS

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    If you are in the UK your best bet is reinforcement plates from Redish Automotive if you don't want to DIY and its just as a preventative. They have had no failures (too date) after one of their repair / plate installs... if you are more worried than that then you need to look at a VinceBar / CMP Auto Engineering bar... I went with a VinceBar but i plan to track mine pretty heavily... I am still pretty convinced a correctly executed inspection, repair and install of Redish Motorsport plates is enough for your run of the mill M3 over a standard life cycle (obviously it only really spreads the load and doesnt directly address the problem but I feel like for 80% of people if your not expecting the car to last millions of miles this type of solution is probably sufficient)... The people who freak out about failures after a plate install are normally talking about Turner Motorsport or equally poorly thought out plates that are only really to assist with crack repair and are useless for preventative maintenance.
     
  4. 9 Nov 2017 at 7:44 AM #4
    AshE46M3

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    ETA Motorsport, Kent, £700.
     
  5. 9 Nov 2017 at 8:30 AM #5
    AdiS

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    Remember, you often can't tell the true state of affairs with regards to the rear axle carrier panel until you have removed the subframe, as the subframe mounts themselves tend to cover up some of the cracks. Also, when you are checking the panel next to the left-rear mount, you have to clean it thoroughly to make sure dirt is not covering any hairline cracks.

    Installing Redish plates or similar is great way to address the localised issue of cracking on the underside of the car. But remember that the root-cause of the issue is actually the fact that the rear axle carrier panel as a whole pulls away from the chassis, and plates don't properly address this issue (it's more of a symptomatic form of treatment). This is where bracing on the top side of the mounts are a good solution (VinceBar, CMP, etc).

    I prefer the VinceBar because once installed, it is completely out of sight, and it also addresses the front top-side mounts. I could be wrong, but I don't think the other brace solutions address the top of the front mounts?

    As mentioned by STAATS, it could be that for the average driver, reinforcement plates are sufficient. I have a crack in the usual left-rear mount location, and I have decided to do the VinceBar bracing as well as Redish plates so that the overall problem is fixed once and for all, and I can drive the car hard with confidence for years to come. Of course, it will increase the cost of the exercise so you will have to make your own assessment of the marginal cost/benefit.
     
  6. 9 Nov 2017 at 9:23 AM #6
    davenwalk

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    Want to do the same - whats your budget?
     
  7. 9 Nov 2017 at 9:24 AM #7
    AdiS

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    Well I am based in South Africa, so I don't think my budget is relevant to a UK-centric discussion.
     
  8. 9 Nov 2017 at 5:03 PM #8
    Adil

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    Did they inspect the cavity with a bore scope?
     
  9. 10 Nov 2017 at 6:25 AM #9
    davenwalk

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    Ja nee, I didn't spot that...

    Jammer boet, hope it rains for you soon!
     
  10. 10 Nov 2017 at 3:41 PM #10
    Macaroni

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    Mine is booked in with Redish motorsport and going in to have this done in February. Not cheap about £1,400 but my view is they are the best and will only add to the price of the car when you come to sell it. I think there will be two prices for these cars in the future, the one that have been done and the ones that haven’t. But what the hell do I know !!!!
     
  11. 25 Sep 2018 at 4:27 PM #11
    Moff

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  12. 26 Sep 2018 at 8:17 PM #12
    M3Loon

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    ETA Motorsport £700 including Vince Brace £1,100. Inc vat
     
  13. 26 Sep 2018 at 9:58 PM #13
    DaveMSport

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    That for just for labour and materials for the plates and brace etc or does it include fitting all new bushes, brakelines and stuff you normally do while your at it?
     
  14. 26 Sep 2018 at 10:09 PM #14
    E46CoupeM3

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    I doubt it even includes new stretch bolts
     
  15. 26 Sep 2018 at 10:37 PM #15
    R60BBA

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    Subbed
     
  16. 26 Sep 2018 at 10:40 PM #16
    Tyler

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    Where are the stretched bolts on the rear ?
     
  17. 26 Sep 2018 at 11:02 PM #17
    schooner32

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    V brace.
     
  18. 26 Sep 2018 at 11:12 PM #18
    Tyler

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    Ok the 3 bolts, don't think they are to expensive.

    Thanks Dude :cool:
     

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