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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Apr-12-2018, 04:24:24 PM   #11
DanAvoN7
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Default Re: Subframe surprise

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Originally Posted by bigjae1976 View Post
I can’t see anything let alone a crack?

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Turn the brightness up on your iphone screen

Kdubski it's not good and you will have to wire brush the underbody to remove the seam sealer and see how extensive the cracking is. It likely extends past the visible cracks in the sealer. Also check the trunk area for cracks/separation near the rear strut towers.
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File Type: jpg Subframe.jpg (279.6 KB, 129 views)
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Old Thu, Apr-12-2018, 04:27:16 PM   #12
TboneM3
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Default Re: Subframe surprise

I still think it might be overlap of the seam sealer and dirt. I would vigorously clean it.
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Old Thu, Apr-12-2018, 05:07:38 PM   #13
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Default Re: Subframe surprise

it's confirmed separating by a local specialty shop. I just want to know how to weld this correctly to hold me over until I do plates this fall.

Last edited by Kdubski; Thu, Apr-12-2018 at 05:14:40 PM.
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Old Thu, Apr-12-2018, 05:33:24 PM   #14
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Default Re: Subframe surprise

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Originally Posted by Kdubski View Post
it's confirmed separating by a local specialty shop. I just want to know how to weld this correctly to hold me over until I do plates this fall.
That wont work. U likely have a failure in the trunk and between the racp panel. U need to do all of this now
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Old Thu, Apr-12-2018, 05:41:24 PM   #15
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Default Re: Subframe surprise

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Originally Posted by HassanEido View Post
That wont work. U likely have a failure in the trunk and between the racp panel. U need to do all of this now
HassanEido is correct, fixing just this part won't solve anything, all needs to be done at once because all the other components will get worse with time causing
more extensive repair which involves alot more time and $$$
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Last edited by Radekxpl; Thu, Apr-12-2018 at 05:45:33 PM.
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Old Thu, Apr-12-2018, 07:21:28 PM   #16
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Default Re: Subframe surprise

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Originally Posted by DanAvoN7 View Post
Turn the brightness up on your iphone screen

Lol...easy there! Y’all must be some serious BMW nerds to catch those cracks from a pic.



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Old Thu, Apr-12-2018, 07:31:23 PM   #17
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Default Re: Subframe surprise

Definitely check inside the trunk for cracks, lift the carpet and it'll be pretty obvious.

Here is my thread as a point of reference

http://www.m3forum.net/m3forum/showthread.php?t=588333
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Old Fri, Apr-13-2018, 03:19:34 AM   #18
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Default Re: Subframe surprise

Would riveting the ridge make any sense? Seems like welding catches the ridge, but riveting would act like the spot welds did and old the 2 panels together.
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Old Fri, Apr-13-2018, 03:44:45 AM   #19
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Default Re: Subframe surprise

I had a crack similar to the one you have and when I did not re-enforcement I found 2 of the subframe mounting points had cracks. One I could see during the inspection and one I did not see until I dropped the subframe. I would fix it ASAP and not drive it much more. If the cracks get to big the cost to fix goes way up.
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Old Fri, Apr-13-2018, 06:13:51 AM   #20
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Default Re: Subframe surprise

any reinforcement done before this crack?
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Discussing Subframe surprise in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)