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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 Sat, Apr-21-2018, 02:58:26 PM   #41
rovert604
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Default Subframe surprise

The trunk panel is not structural. I had that too. When doing Vincebar that had to come off. It carries no load acccept to create a floor for the trunk. What you’re seeing is the sound insulation cracked.

It is much more probable that you will have upper mount cracks though. Underneath you need to clean a lot more to see other cracks. When you can see bare metal after using a grinder, you’ll see everything nice and clear.
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Last edited by rovert604; Sat, Apr-21-2018 at 03:20:56 PM.
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Old Sat, Apr-21-2018, 03:29:16 PM   #42
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Default Re: Subframe surprise

Quote:
Originally Posted by rovert604 View Post
The trunk panel is not structural. I had that too. When doing Vincebar that had to come off. It carries no load acccept to create a floor for the trunk. What you’re seeing is the sound insulation cracked.

It is much more probable that you will have upper mount cracks though. Underneath you need to clean a lot more to see other cracks. When you can see bare metal after using a grinder, you’ll see everything nice and clear.
It's going to be a good time for sure. The crack near the mount is plenty to convince me to get to work. I'm going to speak with a local race shop to get their opinion on what to do - as they specialize in E36 + E46 M3's.

Until I start work - I'm loading up on goodies (camber arms, solid bushings, etc)
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Old Wed, Aug-29-2018, 04:44:32 PM   #43
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Default Re: Subframe surprise

UPDATE:

Took out subframe today. For those following here are the cracks on rear left & front right mounts. Many have told me these are normal and about average for age (101k).







I am welding them up this week with turner plates, powerflex race bushings & a whole lot of other goodies.
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Old Wed, Aug-29-2018, 05:36:42 PM   #44
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Default Re: Subframe surprise

Sounds like a good plan. Good luck.
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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)