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Old 04-11-2014, 03:38 AM   #1
Davew
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02PRUV subframe reinforcement

Inspected the subframe on the 330 today and all looks good. I still want to reinforce the subframe as a precaution. From the pictures of the way 02PRUV has done his top bracing, I am wondering whether it would be necessary to bother to reinforce the underside? Would also mean I can just lower the diff carrier and not completely remove it from under the car. Thoughts? Advice?
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Old 04-11-2014, 04:38 AM   #2
Davew
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Here's some of my thoughts, the first is that 02pruv's upper reinforcement has not failed with the huge amount of hp he runs, I know from reading posts that he also did the plates before going this route.

I personally think this will hold the key mounts with no under plates. I haven't seen photos of how 02PRUV did his front mounts, but I would like to put plate tying the supports under the rear seat to nearby structural points.

I am not a fan of the plates, personally, because of the following:

The sheetmetal in modern cars is higher tensile, I am concerned about putting the heat from welding into the steel and altering its structure/strength.

The sheetmetal is so thin, if the welds are at all undercut, the edges where the welds meet will be a massive weak point.

Will have to totally remove subframe to install, whereas working from the top should only require dropping it off the studs and removing fuel tanks.

Even the plates that cover more area are really just tying back to the chassis from underneath instead of above.

I don't want to spend two days under a car cutting, grinding and welding!!!
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Old 04-11-2014, 04:44 AM   #3
Davconelectric
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Just weld the subframe to the floor. Problem solved


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Old 04-11-2014, 04:56 AM   #4
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Originally Posted by Davconelectric View Post
Just weld the subframe to the floor. Problem solved


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That would take longer, and still mean me under the car with the tig.
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Old 04-11-2014, 04:57 AM   #5
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That would take longer, and still mean me under the car with the tig.

You love it, use liquid nails


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Old 04-11-2014, 06:12 AM   #6
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I recommend you watch some vids from this subframe repairer. If you haven't yet, you will learn a lot

http://www.youtube.com/user/RedishMotorsport/videos
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Old 04-11-2014, 06:47 AM   #7
Davew
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Originally Posted by DamoBMW View Post
I recommend you watch some vids from this subframe repairer. If you haven't yet, you will learn a lot

http://www.youtube.com/user/RedishMotorsport/videos
I have seen their kits, but haven't watched there vids, i will do.

Their kit was actually the plate kit I referred to that does tie back to the chassis rail. If my floor/subframe was already cracked, 100% I would use this as well. My initial feeling of the kit for an un cracked subframe is that it will do part of the job 02pruv's does, but I will watch the vids and see if my thoughts change.

Last edited by Davew; 04-11-2014 at 09:29 AM. Reason: Referred to chassis rail as subframe-changed
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Old 04-11-2014, 06:52 AM   #8
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Originally Posted by Davew View Post
I have seen their kits, but haven't watched there vids, i will do.

Their kit was actually the plate kit I referred to that does tie back to the subframe. If my floor/subframe was already cracked, 100% I would use this as well. My initial feeling of the kit for an un cracked subframe is that it will do part of the job 02pruv's does, but I will watch the vids and see if my thoughts change.
Yeah, most of stuff in the vids wont really apply to you as your subframe isn't completely torn out like his customers cars.
I just found it interesting to watch and learnt a lot.
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Last edited by DamoBMW; 04-11-2014 at 08:52 AM.
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Old 04-11-2014, 06:56 AM   #9
Davew
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Originally Posted by DamoBMW View Post
Yeah, most of stuff in the vids wont really apply to you as your subframe isn't completely torn out like his customers cars.
I just found found it interesting to watch and learnt a lot.
Thanks Damo, appreciate the link
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Old 04-11-2014, 04:44 PM   #10
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You need to plate the floor and do the brace in the back. The brace in the back is to stop the rear of the subframe pulling down under hard acceleration but the front of the subframe tries to push up. So you need to plate. I plated mine not only at the mount points but between mount points as well to distribute the load using 5mm plate.

Also do all bushes at the same time. So your subframe needs to come out anyway.

Don't be lazy
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Old 04-11-2014, 04:48 PM   #11
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like a boss
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Old 04-11-2014, 04:53 PM   #12
///Mpower3357
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plates are working great for me, i had tearing near the front passenger and rear driver mount. Im not sure what HP goals you havr, but even for stock DD its a good idea to just get it done by a professional.

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Old 04-12-2014, 04:21 PM   #13
Davew
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Quote:
Originally Posted by 02PRUV View Post
You need to plate the floor and do the brace in the back. The brace in the back is to stop the rear of the subframe pulling down under hard acceleration but the front of the subframe tries to push up. So you need to plate. I plated mine not only at the mount points but between mount points as well to distribute the load using 5mm plate.

Also do all bushes at the same time. So your subframe needs to come out anyway.

Don't be lazy
Had a closer look at your photos, and a few of my assumptions weren't correct, subframe will be coming out
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Old 04-12-2014, 05:35 PM   #14
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Quote:
Originally Posted by Davew View Post
Had a closer look at your photos, and a few of my assumptions weren't correct, subframe will be coming out

Really not that big a job. Order all new bushing before you remove so your not waiting on anything. Very happy to give you a chop out if you like


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