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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-11-2014, 04:02 PM   #1
Gunsnbacon
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Exclamation What caused this (front subframe reinfocement damage)

I noticed this a while ago and I have no idea what caused it, the damage looks about equal on both sides of the vehicle. The only thing I can think of is a severe bump maybe? Or cheap parts breaking under stress?

Anyways I'm ordering a new brace I was just wondering what can cause this for future reference. My car is lowered but the damage was there before the car was lowered.
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Old 10-11-2014, 04:23 PM   #2
Stinger9
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That car hit something serious to chew it up like that. No other reason it could have happened. Unless someone jacked it way improperly.
Get the new plate on and torque it according to the multi-step instructions.

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Old 10-11-2014, 04:27 PM   #3
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I think the damage may have been there when I purchased the vehicle but I'm not too sure. I only jack it up from the pads or the diff so I know I didn't do that.
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Old 10-11-2014, 05:46 PM   #4
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Does the tear start at the front and move back or at the back and move front? If it starts at the back (which it looks like) my guess goes to a lousy tow truck operator hooking to something they shouldn't have.

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Old 10-11-2014, 05:48 PM   #5
beemernee
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You don't really need a new one just weld/reinforce that one , had it done myself no offence but tyre fitters seem to lack brain cells
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Old 10-11-2014, 05:48 PM   #6
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Quote:
Does the tear start at the front and move back or at the back and move front? If it starts at the back (which it looks like) my guess goes to a lousy tow truck operator hooking to something they shouldn't have.
Yea starts at the back and is on both sides at the 2nd bolt towards the inside.

I don't notice any performance loss from it compared to my other e46 but it just bothers me there's a huge tear right there.
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Old 10-11-2014, 08:31 PM   #7
hitbyastick
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Hit a road hazard. Pretty obvious by the way it's peeled back.
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Old 10-11-2014, 10:15 PM   #8
yjsaabman
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Originally Posted by Gunsnbacon View Post
Yea starts at the back and is on both sides at the 2nd bolt towards the inside.

I don't notice any performance loss from it compared to my other e46 but it just bothers me there's a huge tear right there.
Yup, I stick with my theory. Some tow monkey hooked up to a bad spot (or two).

That would have to be some wipe-out to be going fast enough in reverse to do that damage. If so I think you'd see a lot more evidence under the car.

The early cars had a steel reinforcement bar. I think they switched to aluminum to both save weight and combine some airflow help under the car all in one piece. It looks like it tore back to the boxed/reinforced section.

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Old 10-11-2014, 10:23 PM   #9
wildirish317
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Make sure you get new bolts. These are "torque to yield" and should not be re-used.
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Old 10-11-2014, 11:58 PM   #10
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These are "torque to yield" and should not be re-used.
Totally agree.
BMW mechanic who is a friend just told me his dealership never replaces the bolts, just uses the old ones.
Reason #68 why I hate to leave my car with a dealer. Much rather DIY to take better care of my car. Here is an instance where I can do better than the professionals!
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Old 10-12-2014, 12:17 AM   #11
Gunsnbacon
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Yea looking at it more, it looks like somebody put tow hooks right there and tried to move the car. I always replace bolts with any new part, from DISA to caliper carry and even door cards.
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