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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 Fri, Mar-17-2017, 03:17:36 PM   #1
Flow
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Thumbs down RACP cracking / separation

Hello Everyone -

I guess it is always good to remind everyone that every single E46 RACP is bound to fail.
Those cars get old now and cracks appear.

Here is my car. I have owned it for 7 years now and did not commit to this issue until now.
Car has 52k miles and I have been driving it "normally". No burnout, no agressive driving. I did enjoy it on back roads and on the track twice, but I believe I am quite gentle with the drivetrain.

I lowered the whole rear end :




And assessed the damage. I thought I would have no cracks or very minimal.
The mounting points were quite promising.




But the wheel well separation looks quite bad.



So here it is, we need to reinforce those chassis.
Plates might only prevent cracks from appearing at the subframe mounting bolts. RACP separation on the other hand can only be prevented by a VinceBar style reinforcement, or maybe structural foam. I'm no expert on that.

I will completely rebuild the rear end : every bushing, end link, bearing, and clean everything. It will be spotless and brand new once I'm done. Chassis will be reinforced with Reddish plates and VinceBar.
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Old Fri, Mar-17-2017, 03:20:20 PM   #2
raindog
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Default Re: RACP cracking / separation

Check out CMP Auto Engineering's new brace too

Sent from my SM-G935W8 using Tapatalk
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Present: '02 E46 M3 vert 6mt, Carbon Black
(soon to be installed: Karbonius CSL intake & snorkel, Turner pulleys, Mishimoto e-fan, Schrick 288/280 cams+DLC followers, WPC rod bearings, Afe street headers+catback, JB flywheel, CDV delete, Rogue Octane SSK, TTFS Alpha N tune, ST XTA coilovers, ST swaybars, ECS camber arms, reinforcement, CMP Auto Engineering subframe brace, Rogue Racebrace, poly mounts/bushings, CSL rotors, SS lines, some carbon stuff)

Past: '99 E36 328i vert 5mt, Avus Blue
(Afe 3.5" intake, Porsche 3.5" MAF, Afe 3.5" elbow, Turner pulleys, Mishimoto e-fan, Z3M rad, Riot BBTB, 24 lb injectors, Schrick 256/264 sport cams, eBay headers, Borla catback, JB flywheel, M3 clutch, CDV delete, B & M SSK, UUC DSSR, M3 3.23 LSD, TRM custom tune, KW V1, Vorshlag camber plates, Turner camber arms, reinforcement, Rogue Racebrace, poly mounts/bushings, vented rotors, SS lines, M-tech body kit, Rieger GT front lip, Fancywide full rear diffuser)
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Old Fri, Mar-17-2017, 03:23:19 PM   #3
Flow
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Default Re: RACP cracking / separation

Quote:
Originally Posted by raindog View Post
Check out CMP Auto Engineering's new brace too

Sent from my SM-G935W8 using Tapatalk
I already have my VinceBar. Actually have had it for over a year now.
And I installed one on a friend's car, so I already kind of know the process.
I will stick with that
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Old Fri, Mar-17-2017, 03:25:32 PM   #4
raindog
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Default Re: RACP cracking / separation

Quote:
Originally Posted by Flow View Post
I already have my VinceBar. Actually have had it for over a year now.
And I installed one on a friend's car, so I already kind of know the process.
I will stick with that
Gotcha, good luck with the project!
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Present: '02 E46 M3 vert 6mt, Carbon Black
(soon to be installed: Karbonius CSL intake & snorkel, Turner pulleys, Mishimoto e-fan, Schrick 288/280 cams+DLC followers, WPC rod bearings, Afe street headers+catback, JB flywheel, CDV delete, Rogue Octane SSK, TTFS Alpha N tune, ST XTA coilovers, ST swaybars, ECS camber arms, reinforcement, CMP Auto Engineering subframe brace, Rogue Racebrace, poly mounts/bushings, CSL rotors, SS lines, some carbon stuff)

Past: '99 E36 328i vert 5mt, Avus Blue
(Afe 3.5" intake, Porsche 3.5" MAF, Afe 3.5" elbow, Turner pulleys, Mishimoto e-fan, Z3M rad, Riot BBTB, 24 lb injectors, Schrick 256/264 sport cams, eBay headers, Borla catback, JB flywheel, M3 clutch, CDV delete, B & M SSK, UUC DSSR, M3 3.23 LSD, TRM custom tune, KW V1, Vorshlag camber plates, Turner camber arms, reinforcement, Rogue Racebrace, poly mounts/bushings, vented rotors, SS lines, M-tech body kit, Rieger GT front lip, Fancywide full rear diffuser)
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Old Fri, Mar-17-2017, 03:26:20 PM   #5
Flow
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Default Re: RACP cracking / separation

Quote:
Originally Posted by raindog View Post
Gotcha, good luck with the project!
Thanks, I will need that One step at a time, and everything perfectly done I hope
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Old Fri, Mar-17-2017, 03:33:38 PM   #6
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Default Re: RACP cracking / separation

Just about the right time to get in there. Nice peace of mind after forsure!
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Old Fri, Mar-17-2017, 03:40:43 PM   #7
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Default Re: RACP cracking / separation

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Originally Posted by PITT M3 RR View Post
Just about the right time to get in there. Nice peace of mind after forsure!
The right time would have been 7 years ago I guess.
But it's not too late, and that is really good
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Old Fri, Mar-17-2017, 04:30:21 PM   #8
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Default Re: RACP cracking / separation

Nice looking shop!
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Old Fri, Mar-17-2017, 04:37:51 PM   #9
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Default Re: RACP cracking / separation

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Nice looking shop!
Thank you I'm quite lucky with my garage. Just under my house so I don't even have to go outside when it rains to work on my car.
Still have a lot of work to make it nice and clean. But it'll do for now.
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Old Fri, Mar-17-2017, 05:27:15 PM   #10
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Default Re: RACP cracking / separation

Looks minimal. It should be noted that the left rear crack as well as separation could be seen without dropping rear assembly. The front mount, no, but luckily yours is minor.

My grey car was cracked in the same three places but considerably worse at the front mount and left rear.
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Discussing RACP cracking / separation 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)