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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 11-03-2012, 06:30 PM   #1
msane3
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Previously repaired subframe m3's and other e46's get in here!

So today I decided to swap the wheels on my m3 and give it a thorough inspection. I lifted my car up to inspect everything looked good and tight. I had already repaired small cracks on my subframe and installed the tms subframe reinforcement kit. I decided to give my rear end a close inspection with a strong flashlight. Upon deeper inspection I noticed some slight cracking above off the the side of the rear passenger's Carrier mounting point.
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I was pretty shocked and have come to the conclusion that even if repaired and reinforced, the subframe will find the next weakest spot to strain and crack at. Luckily I have a decent welder and have good welding skills so I decided to throw a bead on it.
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I check my subframe thoroughly every 6 months or so. Last time I checked this was not there. I only occasionally drive my car hard so this makes me weary of future problems and how many times I will have to repair this thing.
As a preventative measure I suggest you all have your car inspected regularly for cracks. They can be much more easily repaired before it turns into a major tear. Food for thought.
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Old 11-03-2012, 10:38 PM   #2
Ballerbrian4u
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Hey, I hope it doesn't crack anymore. I have a question if I jack my car up and take the rear wheels off could I see from that point if there are any cracks?
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Old 11-03-2012, 10:40 PM   #3
msane3
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Hey, I hope it doesn't crack anymore. I have a question if I jack my car up and take the rear wheels off could I see from that point if there are any cracks?
You don't need to take your wheels off but jack your car up high enough to be able to get under it. A good flashlight really helps. Driver's rear point and passenger's front point where the carrier mounts are most prone to cracking.
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Old 11-04-2012, 12:37 AM   #4
AzCamel
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do you have a wider shot to show me where i should look under the car?
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Old 11-13-2012, 09:06 AM   #5
msane3
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do you have a wider shot to show me where i should look under the car?
I think I might have some better shots from when I originally reinforced my subframe. If you google e46 subframe. You will get awesome shots of the problematic areas.
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Old 11-13-2012, 10:35 PM   #6
YGOSLO
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Would doing the platesomined with the foam help reduce this in your opinion?
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Old 11-13-2012, 10:39 PM   #7
msane3
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Would doing the platesomined with the foam help reduce this in your opinion?
It might. It will be structurally a lot stronger with the foam since it won't be able to flex and rock as easily. I purchased the foam for my car but have been hesitant to use it since I won't be able to weld on the subframe anymore. It might catch fire.
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Old 11-14-2012, 11:52 AM   #8
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You would hope no more cracks would form with the foam in there....
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Old 11-14-2012, 05:56 PM   #9
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YGO: Sorry to hijack, but the color combo on your car is just stunning. There's just something about red leather seats...
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Old 11-14-2012, 06:39 PM   #10
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YGO: Sorry to hijack, but the color combo on your car is just stunning. There's just something about red leather seats...
Thanks, they were originally black. I got the Imola Red from another enthusiast. Really helped my love affair with the M. The black was just too bland.
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