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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 Wed, Aug-09-2017, 12:31:50 AM   #1
demolitionskunk
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Default 2006 model year subframes

I've heard that for the 2006 production year, BMW gave the M3 the same double floor as the vert so it doesn't get cracks at the subframe mounts.

Has anyone else heard this? Is it true?
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Old Wed, Aug-09-2017, 12:48:24 AM   #2
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Default Re: 2006 model year subframes

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Originally Posted by demolitionskunk View Post
I've heard that for the 2006 production year, BMW gave the M3 the same double floor as the vert so it doesn't get cracks at the subframe mounts.

Has anyone else heard this? Is it true?
I have not heard that but I have heard that the E46 M3 failure rate on subframes is about 8% overall.
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Old Wed, Aug-09-2017, 01:04:50 AM   #3
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Default Re: 2006 model year subframes

I just found this thread where someone says (near the bottom of the page) the '06 M3 has the vert subframe.

https://www.reddit.com/r/BMW/comment...rcement_heres/

Hopefully it's true...
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Old Wed, Aug-09-2017, 01:07:16 AM   #4
demolitionskunk
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Default Re: 2006 model year subframes

Unfortunately, I discovered my '02 coupe was part of that 8% just before I sold it.
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Old Wed, Aug-09-2017, 01:37:14 AM   #5
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Default Re: 2006 model year subframes

I think that James at Redish Motorsport has discussed this "myth" about the 'vert floor before... I don't think it is any thicker I think there is some additional plastic inserts in the sandwich which he postulates are supposed to be "dams" for when you use the BMW Structural Foam.

I do think I read somewhere that the later years (05 and 06 I think) did recieve the 'vert floor... So I think the 06 does have the 'vert floor but it is not immune to the subframe issue.

Google some of the videos from Redish Motorsport on this or have a look at some of the technical breakdowns of the issues by VinceSE2 and you will see no E46 is immune or "fixed" from factory...
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Old Wed, Aug-09-2017, 01:45:51 AM   #6
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Default Re: 2006 model year subframes

All the floors are the same except BMW moved a couple of the spot welds around. Not sure what year that happened. STAATS is correct, the only change was the plastic dams which provide no additional structural support. The vert has an additional bulkhead welded on but the subframe itself is identical. Reddish does go over that in one of his teardown videos.

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Old Wed, Aug-09-2017, 04:52:16 PM   #7
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Default Re: 2006 model year subframes

Quote:
Originally Posted by norcal420 View Post
I have not heard that but I have heard that the E46 M3 failure rate on subframes is about 8% overall.


Can't be that low...
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Old Wed, Aug-09-2017, 05:08:11 PM   #8
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Default Re: 2006 model year subframes

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Originally Posted by Slowmobile View Post
Can't be that low...
It's not. People just don't know how to check them. You cannot check the cracks without removing the subframe.

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Old Wed, Aug-09-2017, 06:16:49 PM   #9
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Default Re: 2006 model year subframes

Have an 06, had a small crack. Now reinforced.
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Old Wed, Aug-09-2017, 06:22:03 PM   #10
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Default Re: 2006 model year subframes

Quote:
Originally Posted by Mr. Wolfe View Post
It's not. People just don't know how to check them. You cannot check the cracks without removing the subframe.

Mr. Wolfe
*And borescope the tops of the receiver spot welds.
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Discussing 2006 model year subframes 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)