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Old 11-27-2012, 12:25 PM   #1
ex3mal
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Exclamation had recently rear sub frame crack fixed by RAVEN

i bought my m3 almost 3 years ago and guy told me there was sub frame re-inforsment kit installed(my mechanic confirmed, but ewrething was coverd with rast proof so hi cant see quality of welds). so i was never looking there for any cracks. one day at cayuga track i heard some metal noise and start looking and found some big cracks!!!! mechanic who installed re-inforsment kit didnt do a good weld an it become a disaster. at some point i was ready to sell my car. my mechanic told me hi cant handle this repair an i have to find someone who have lots of expirience with this chassis. i found RAVEN/BAVARIAN Motors. one i got to the shop i was very impressed how many racing bmw was in the shop. repairs all done and im very happy, here is some pix
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Old 11-27-2012, 08:22 PM   #2
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some pix afrer rust proof removed

previos fix with very poor weld
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Old 11-27-2012, 08:26 PM   #3
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repair

so after previos repair regular reinforsment kit wont do the job, so they have to desigh they own kit with lots of plates
Attached Images
File Type: jpg 1.jpg (210.9 KB, 309 views)
File Type: jpg Slava Koval E46 M3 Project - 2012 011.jpg (67.8 KB, 310 views)
File Type: jpg Slava Koval E46 M3 Project - 2012 012.jpg (77.2 KB, 309 views)
File Type: jpg Slava Koval E46 M3 Project - 2012 013.jpg (69.0 KB, 308 views)
File Type: jpg Slava Koval E46 M3 Project - 2012 014.jpg (67.6 KB, 310 views)
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Old 11-27-2012, 08:34 PM   #4
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tower brace

its not my daily draiver, most of the milage car get on the way to the track and on the track, so they weld me in tower brace, they connect sub frame to the body, after this brace car more stiffer!!! Good luck with your M, and hope u dont have to go thru the same repair!!! if u gettting kit installed make shure its done frome first time, cuz to fix somebodys mess is a mess hehe
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Old 11-28-2012, 12:18 AM   #5
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What was the total cost?
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Old 11-28-2012, 08:38 AM   #6
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3000+
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Old 11-30-2012, 01:19 PM   #7
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Money well spent.

If I ever pick up an M3, this will be my first mod before FI
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Old 11-30-2012, 03:06 PM   #8
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If u do this before problem starts I'm pretty shure it will be cheaper than to fix after somebodys mess
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Old 11-30-2012, 08:33 PM   #9
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Why do they crack ?
Too much power or poor choice of metal used in building the car?
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Old 11-30-2012, 08:54 PM   #10
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There was recall but it's over, not all of the e46 cars have it
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Old 11-30-2012, 09:16 PM   #11
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for Steve at Raven. He's an outstanding fabricator. I'm also very pleased with all the custom metal work on my E12 especially the exhaust system.
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Old 11-30-2012, 10:24 PM   #12
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I'm very happy with his work, everything looks very clean and solid. Hehe
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Old 04-07-2013, 02:27 PM   #13
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What are the symptoms of a damaged subframe?
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Old 04-07-2013, 05:12 PM   #14
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Cracking noise and after I chech in trunk and seen cracks
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Old 04-07-2013, 05:26 PM   #15
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Quote:
Originally Posted by Robb View Post
Why do they crack ?
Too much power or poor choice of metal used in building the car?
Power has nothing to do with it. 323s been reporting failures as early as 50k kms.

Its a mystery, well not really but much so. First , the design of the rear subfloor hasnt changed much from the E36 which had a bad bad design to start with. And then its the sheet metal suppliers at certain years. 98-02 have THE most damage , 03+ cars rarely are seen with damage because BMW physically changed the rear subfloor design after 03. M3 will all have damage because they havent got the new updated subfloor as standard.
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What are the symptoms of a damaged subframe?
Cracks in the rear subfloor sheet metal. Those are the symptoms.


Poor maintenance also leads to this. Reaplce your diff bushes, subframe bushes and in general keep your car in good shape if you wish to enjoy it.
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