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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 09-06-2013, 07:18 PM   #1
SoloII///M
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Anyone seen the rear diff mount fail like this?

I've seen bad subframe attachment points on the chassis but never a failure like this.

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Old 09-06-2013, 07:25 PM   #2
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Anyone seen the rear diff mount fail like this?

Wow. You're laying down some power there. Lol


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Old 09-06-2013, 07:57 PM   #3
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Anyone seen the rear diff mount fail like this?

Ha! Not really. It's just been abused for its entire life.


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Old 09-07-2013, 01:54 AM   #4
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Never like that, I've seen the bushing rip apart on multiple occasions, but never that.
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Old 09-07-2013, 11:22 PM   #5
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I've seen it before, but it's definitely not common
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Old 10-16-2013, 12:48 AM   #6
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Can you explain what happened here and how you can prevent that? would replacing the bushing earlier on help, or was that caused by failure in the subframe metal?
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Old 10-18-2013, 09:14 PM   #7
SoloII///M
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Anyone seen the rear diff mount fail like this?

I think it was probably a fluke occurrence. This car has been raced since new so it has had a tough life.


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Old 10-18-2013, 10:04 PM   #8
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What are you options for repair? Can you weld it or just source a new subframe?
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Old 10-19-2013, 08:11 AM   #9
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I just bought a used subframe and am swapping it out. No big deal, subframes are cheap. I think welding it would be tough, that area is all egged out. Making it round again is next to impossible and not worth the effort.

If it were legal under the rules I compete I would weld a bit of reinforcing sheet metal across the top to strengthen the diff mount area. That area is in tension during every launch so it becomes a fatigue point.
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Old 11-14-2013, 01:56 PM   #10
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I've done that twice. After the second time I reinforced the mount by adding a plate there for rigidity.
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