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DIY: Do It Yourself
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Old 03-05-2016, 10:49 PM   #1
the521one
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E46 3 Series Cheaper way to Reinforce your rear Subframe DIY

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Old 03-06-2016, 12:13 AM   #2
Alex323Ci
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that's old news around here.

and the award for "Best Editing" goes to...


not that vid
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Old 03-06-2016, 11:49 AM   #3
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Seems clutch dumping and generally driving like a d-bag will accelerate the problem. Yes?

Give Han a break for doing a pretty good job of explaining how the damage happens. Yet I'd rather do the Redish Motorsports plates + structural foam method if I had damage which I'm glad to say I don't.
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Old 03-06-2016, 05:11 PM   #4
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Yeap. Clutch dumping will definitely increase the chances of getting your mounts cracked and ripped apart eventually. Thank you for your genuine appreciation.
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Old 03-06-2016, 05:13 PM   #5
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Use structural foam instead
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Old 03-06-2016, 05:21 PM   #6
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The redish method is probably the best method besides cutting out and making your own panel out of thicker steel as someone in the Australian forums has done.
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Old 03-06-2016, 09:26 PM   #7
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Are there any concerns about rust when drilling into the body of the car?
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Old 03-06-2016, 09:29 PM   #8
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You can try your best to clean the rust and then drill but ones the threaded rod is installed you can block the holes with it. Also the subframe mounts and the bi washer covers the hole so no water can go in.
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Old 03-07-2016, 02:02 PM   #9
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well nice to see this was moved to the DIY Section now and out of GENERAL. it makes more sence here and fits in.

if you're the author of this DIY then thanks for taking the time to show others of your install.

few questions for you:
you never show fixing the floor underneath where there are huge holes from the mounts tearing through. you have one on the Front right and one on the Rear left. but never address the torn floor and missing metal??

the brace only works for the rear two mounting points. but you have a front mount breach. what did you do to fix the front?
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Old 03-07-2016, 03:21 PM   #10
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Just look at the mason installation guide
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Old 03-07-2016, 04:10 PM   #11
the521one
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Originally Posted by Alex323Ci View Post
well nice to see this was moved to the DIY Section now and out of GENERAL. it makes more sence here and fits in.

if you're the author of this DIY then thanks for taking the time to show others of your install.

few questions for you:
you never show fixing the floor underneath where there are huge holes from the mounts tearing through. you have one on the Front right and one on the Rear left. but never address the torn floor and missing metal??

the brace only works for the rear two mounting points. but you have a front mount breach. what did you do to fix the front?
Great question! Unfortunately, I no longer have this car and I was quickly briefing as I was filming this video. As for your question about the front mounts and gigantic holes: I had to take off the back seat and install a customized brace with the same exact procedure for the rear mounts. I purposely skipped this section due to rarity of this condition. As for the gigantic holes, the fact that they did not effect the way the car drives, they remained as they are except cleaned and covered with 3M all weather proof tape to block any water going in and rusting the inner side of the chassis. However, the subframe bushings and the washers already covered the holes so it was just extra protection. You mentioned spending $5000 for your 323ci? Well, I bought my car for 2300 and it was my first project car for me to fix everything on it and learned so much from it. My thing is buying cheap e46 cars for fun project cars that I can beat on and my main focus is to spend the least amount of money to have most amount of fun!
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Old 03-08-2016, 04:58 AM   #12
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You can get repair panels from a german tuner. It was a lot of work, but for me the best way to fix the problem.

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Old 03-08-2016, 01:47 PM   #13
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pretty sure plates+epoxy is gonna be cheaper than the mason bar if you DIY Did min for less than $100
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Old 03-08-2016, 02:22 PM   #14
the521one
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pretty sure plates+epoxy is gonna be cheaper than the mason bar if you DIY Did min for less than $100
Yea I thought about learning how to weld myself but then I've heard even after you weld the plates on top of the mounts, they can get weaker within time. As for me, the x brace worked because I was able to dump my clutch in any gear and floor the gas pedal :p
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Old 03-08-2016, 02:22 PM   #15
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You can get repair panels from a german tuner. It was a lot of work, but for me the best way to fix the problem.

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This looks fantastic!
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Old 03-08-2016, 04:24 PM   #16
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I'd rather reinforce by using:

1) Plates

2) Structural foam

3) Poly bushings for even load distribution (flat tops)

Seems this contraption only addresses 2 out of 4 mounts, takes up trunk space, and causes irreversible damage/modification to the trunk floor. Not to mention adds a bunch of weight and makes fold down seats useless.
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Old 03-08-2016, 04:36 PM   #17
the521one
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I'd rather reinforce by using:

1) Plates

2) Structural foam

3) Poly bushings for even load distribution (flat tops)

Seems this contraption only addresses 2 out of 4 mounts, takes up trunk space, and causes irreversible damage/modification to the trunk floor. Not to mention adds a bunch of weight and makes fold down seats useless.
I cannot agree with you more

Like I've said, the upside of having this x brace is not having to worry about your subframe mounts ever! IF this car was my only daily car, I would have went with the plates. However, thats not the case for me so I went with having more fun with few disadvantages
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