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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 Mon, Mar-31-2014, 10:19:38 PM   #1
HJB///SMG
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Default Subframe cracking, opinions needed!

Car is in the shop for differential repair and they saw this (photo). It seems like a small crack to me, but I don't know how fast these things grow. Anybody have an idea if this should be an immediate fix or if it is not serious at this stage? I know it will probably eventually need to be done, but how long do you think this could wait if at all?

Thanks for any input,
HJB
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File Type: jpg E46 M3 SUBFRAME CRACK.jpg (383.5 KB, 257 views)
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Old Mon, Mar-31-2014, 10:37:31 PM   #2
domer10
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Default Re: Subframe cracking, opinions needed!

I would think it should require immediate attention, and from what I have read you def do not wanna push the car hard, seems that putting lots of strain on rear end will make it worse...so no hard take offs, fishtailing etc.
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Old Mon, Mar-31-2014, 10:46:36 PM   #3
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Default Re: Subframe cracking, opinions needed!

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Originally Posted by domer10 View Post
I would think it should require immediate attention, and from what I have read you def do not wanna push the car hard, seems that putting lots of strain on rear end will make it worse...so no hard take offs, fishtailing etc.
This, bc if it cracks more it might get more expensive later. I did the TMS kit and oem bushings for the subframe and RTABs.
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Old Mon, Mar-31-2014, 10:54:04 PM   #4
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Default Re: Subframe cracking, opinions needed!

look into the reddish kit as well, i have their kit and love it.
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Old Mon, Mar-31-2014, 11:14:27 PM   #5
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Default Re: Subframe cracking, opinions needed!

the reddish kit seems to be a more extensive kit and i think it will strengthen more than the TMS kit
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Old Mon, Mar-31-2014, 11:58:20 PM   #6
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Default Re: Subframe cracking, opinions needed!

This is something I am going to address immidiately, just emailed the shop to see if they plan on using a kit like the TMS or Reddish or plan to fab their own. They are a reliable shop I have used for years and the owner has owned my exact car so they should know what they are talking about, but does anyone think it would be better to get one instead of them fabricating? They quoted $900, think it is a good price?

Thanks,
HJB
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Old Tue, Apr-01-2014, 12:30:13 AM   #7
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Default Re: Subframe cracking, opinions needed!

$900 just to fab a kit or fab and install? I think it's pretty common to see an install price anywhere from $1,000-$2,000 depending if there just welding a TMS/Reddish kit in or if they're also installing subframe/diff bushings. You might as well replace those if you're going to drop the rear end out anyways, ends up being cheaper in the long run.
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Old Tue, Apr-01-2014, 02:50:39 AM   #8
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Default Re: Subframe cracking, opinions needed!

Quote:
Originally Posted by c0rehax View Post
$900 just to fab a kit or fab and install? I think it's pretty common to see an install price anywhere from $1,000-$2,000 depending if there just welding a TMS/Reddish kit in or if they're also installing subframe/diff bushings. You might as well replace those if you're going to drop the rear end out anyways, ends up being cheaper in the long run.
900 for the whole job, fab of parts welding full repair. probably going to take your advice and upgrade diff and subframe mounts while it is out.

thanks
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Old Tue, Apr-01-2014, 02:58:09 AM   #9
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Default Re: Subframe cracking, opinions needed!

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Originally Posted by HJB///SMG View Post
900 for the whole job, fab of parts welding full repair. probably going to take your advice and upgrade diff and subframe mounts while it is out.

thanks
Sounds like a good price. I paid 2k including rtab and subframe bushings with the tms kit
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Old Tue, Apr-01-2014, 03:11:31 AM   #10
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Default Re: Subframe cracking, opinions needed!

Hey man, I'm suffering the same scenario. I have an 02 with 84k and I noticed the crack a few thousand miles ago and hasn't grown. It's urgent but not as urgent as some would think. It took a 100 k to get there but I would get it repaired before the fall.
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Discussing Subframe cracking, opinions needed! 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)