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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 Sun, Jul-15-2018, 01:57:31 AM   #1
nujav
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Default Trunk floor flexing a tiny bit at higher rpm shifts.

My floor is slightly flexing inside the trunk where the black OEM deadining material is and makes a light pop noise, I did do the turner subframe plates and welding it into the bottom, but the shop did not weld inside the trunk at all.

What is the best way to fix this issue? I did not see any cracks from underneith the car after the subframe plates were installed.

I think I will do either Vincebar or Mason from the trunk. Then it should be bullet proof? And I have never welded before but would like to try welding it my self, or should I get a professional do it?



Edit: Added a video. I sent Vince a PM about the bar and cups since I couldn't find anywhere to purchase online. I may just epoxy it in my self so I can work on it and visualy inspect the subframe with my eyes.

The video is a bit hard to see, you need to full screen it and look closly at the mid floor where the black sound deadening material is and you can see it flex. 2 seconds in the video you can see some flex.
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Last edited by nujav; Sun, Jul-15-2018 at 03:47:51 AM.
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Old Sun, Jul-15-2018, 02:00:18 AM   #2
Coinage
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Default Trunk floor flexing a tiny bit at higher rpm shifts.

VinceBar and cups along with stitch welding the seams where spot welds have torn away is a better solution than just a mason bar.

If the floor is moving then itís most likely moving at the front right mount pad front on the top where the threaded box has pulled away from the one panel so a mason bar wonít help at all with that.

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Old Sun, Jul-15-2018, 02:01:51 AM   #3
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

Get a pro. If you have never welded sheet metal is hard to weld I have been welding over 25 years and if you donít have the skill leave it to someone that does. I have seen tones of welds diy that break because of improper technique.


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Old Sun, Jul-15-2018, 10:59:13 PM   #4
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

I'd have a look behind the rear dampeners and see if there's a split in the seam sealer at the bottom of the wheel arch.

If this area was not stitch welded during the plate install it is the initiation point of secondary failure the majority of the time.

Alternatively, cracks can form just behind the rear wheel arch in the tight radius between the 3 planes. After that separation between the boot floor and chassis rail is common as well as behind the subframe mount beneath the end of the heat shield.

If you shoot me an email I can send through some literature that should help you inspect it yourself.

E: info@cmpautoengineering.com

If you're looking for a more comprehensive repair I offer a few topside reinforcement options. All prices are in Aud.

http://cmpautoengineering.com/shop/

Good luck with the repair!
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Old Sun, Jul-15-2018, 11:18:36 PM   #5
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

You can reach Vince on Facebook: Practical Performance RnD

Good luck!
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Old Mon, Jul-16-2018, 08:21:52 AM   #6
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

Wow CMP looks great too, so hard to pick. I was thinking of getting a half cage installed that ties to the 4 mounts on top of the vincebar but the CMP looks solid enough that I wouldnt need a half cage to bullet proof the RACP/subframe.
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Old Mon, Jul-16-2018, 03:42:31 PM   #7
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

Get that braced. Or say good bye to that racp soon
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Old Tue, Jul-17-2018, 03:23:44 AM   #8
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

Quote:
Originally Posted by nujav View Post
Wow CMP looks great too, so hard to pick. I was thinking of getting a half cage installed that ties to the 4 mounts on top of the vincebar but the CMP looks solid enough that I wouldnt need a half cage to bullet proof the RACP/subframe.
Funny that you mention that. That's essentially exactly what I am doing.

I had the laser notched tubes arrive last week and I'll be fabricating the first prototype 6-point brace this weekend. Triangulates all 4 subframe mounts with the rear shock towers.



When finalised it will be available in kit for for $650 Aud (~$480 USD). It's entirely bolt in and can be removed when the entire boot function is needed.

I was intending to expand on this brace by designing a bolt in half cage where the back stays mount onto the horizontal bar just inbound of the rear shock towers.

I'll be posting pics here if you'd be interested in following.

https://www.facebook.com/cmpauto/
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Old Tue, Jul-17-2018, 03:59:15 AM   #9
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

I inspect my racp every time I raise my car. Despite having no cracks and reinforcement plates installed I am still going to get the cmp 6 point brace once it's available. Rod bearings, vanos, and the racp are components that should not be left to chance.
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Old Tue, Jul-17-2018, 04:01:19 AM   #10
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Default Re: Trunk floor flexing a tiny bit at higher rpm shifts.

BTW I'm pretty sure every racp flexes under load. Which is what makes them crack/tear to begin with.
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Discussing Trunk floor flexing a tiny bit at higher rpm shifts. 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)