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View Full Version : had recently rear sub frame crack fixed by RAVEN


ex3mal
11-27-2012, 12:25 PM
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

ex3mal
11-27-2012, 08:22 PM
previos fix with very poor weld

ex3mal
11-27-2012, 08:26 PM
so after previos repair regular reinforsment kit wont do the job, so they have to desigh they own kit with lots of plates

ex3mal
11-27-2012, 08:34 PM
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*wave*

ac_2007
11-28-2012, 12:18 AM
What was the total cost?

ex3mal
11-28-2012, 08:38 AM
3000+

ac_2007
11-30-2012, 01:19 PM
Money well spent.

If I ever pick up an M3, this will be my first mod before FI :D

ex3mal
11-30-2012, 03:06 PM
If u do this before problem starts I'm pretty shure it will be cheaper than to fix after somebodys mess

Robb
11-30-2012, 08:33 PM
Why do they crack ?
Too much power or poor choice of metal used in building the car?

ex3mal
11-30-2012, 08:54 PM
There was recall but it's over, not all of the e46 cars have it

///Maluco
11-30-2012, 09:16 PM
*th-up**th-up* 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.

ex3mal
11-30-2012, 10:24 PM
I'm very happy with his work, everything looks very clean and solid. Hehe

Slow36
04-07-2013, 02:27 PM
What are the symptoms of a damaged subframe?

ex3mal
04-07-2013, 05:12 PM
Cracking noise and after I chech in trunk and seen cracks

nnnalex
04-07-2013, 05:26 PM
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.
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.

4doors
10-18-2013, 06:04 PM
Interestingly enough in the class action lawsuit launched in the US, during the settlement BMW agreed to fix the problem provided that owners did not mount wheels over the manufacturer recommended 18 inches. The court agreed. So, if you were dumb enough to show up at a dealer with 19 inch wheels to get $5000 in free welding done at BMW's expensive, you were informed you failed to follow the recommendation and the work would not be covered under the settlement.

ex3mal
10-18-2013, 06:24 PM
If u dumb enough not to know what after 03 they come with 19" rims, nobody can help u

Vassago12
10-19-2013, 11:53 AM
Those original welds were terrible! No surprise it failed again. The new setup however looks fantastic!

ex3mal
10-19-2013, 12:03 PM
It failed on my 18 with ps2 on track, 19 had some shitty tires and was used for shows and cruz, 18 is track set up, sold 19 last year

4doors
10-19-2013, 01:00 PM
If u dumb enough not to know what after 03 they come with 19" rims, nobody can help u

Maybe post 2003 owners are not part of the class. More or less, the fate of 1000s of owners rested on a single judge listening to both sides of the argument. If the plantiff's lawyers failed to point this out, or there was not enough evidence to support the case, I could see how the 18-inch wheel restriction could be squeezed in. Unfortunately if you had a crack, and 19-inch wheels and they were from the factory, you'd be left out. It's pretty evil not to fix all the cars that had cracks but then again, it's not like BMW failed to put a metal shield in front of the gas tank to protect rear seat occupants from being immolated in a rear end collision all for the sake of saving a few bucks. You have to buy an old GM to get to that level of evil.