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Resurrection of my green BMW

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CanadianMiniFan
Posts: 159
Joined: Oct 16, 2011 6:31 PM

Re: Resurrection of my green BMW

Post by CanadianMiniFan »

Small update, did some more work yesterday. My plan has been to roll the rear quarter panels, and weld them to the inner fender rather than make a new lip for the inner. Not OEM, but I'd rather have the extra clearance in case I find some nice wider/lower offset wheels in the future, I dont want to have to cut or bend metal to make em fit. I borrowed a fender roller from a friend, and quickly jacked the old subframe and trailing arms into place. Unfortunatley, my suspicions were confirmed, when I tried using the roller, I quickly realized the outer quarter panel just flexed outwards rather than folding the flange. This is because the outer was not welded to the inner. A fairly foreseeable issue, so I quickly abandoned the fender roller, removed the subframe, and reverted to the trusty hammer and dolly. Started the fold with pliers and then slowly went back and forth with the hammer. Turned out just how I wanted, and there wasnt much, in some places no, overlap between the outer lip and the inner. I also noticed higher up in the wheel well a plug in an access hole, so it should be easier for me to absolutely hose some pain into the fender lip, and later hose wax in there for rust proofing. Anyway heres some pictures!

Folded

ImageIMG_0597 by Warren Tomlinson, on Flickr

Slight gap to the inner fender. I'd love to say I had this perfectly planned, calculating the bend radius of the outer flange, but I basically cut out the inner flange up to where it was solid, and it happened to line up well. Nice to get some luck now and again.

ImageIMG_0599 by Warren Tomlinson, on Flickr

Welded

ImageIMG_0600 by Warren Tomlinson, on Flickr

Close up, and you can see the access plug which I will use for paint/wax

ImageIMG_0601 by Warren Tomlinson, on Flickr

Thats all for now, Will try to get this ground down next week, and I have to make a couple little filler pieces to close off the front and rear ends of this seam. Don't want to leave any caps for water/mud, I know with the welding in the area, I'm susceptible to corrosion as it is, don't need to encourage it!
CanadianMiniFan
Posts: 159
Joined: Oct 16, 2011 6:31 PM

Re: Resurrection of my green BMW

Post by CanadianMiniFan »

Another update! Got the arch welds ground out, filled the ends in and seam sealed, so that's sorted. Shifted my attention to the rear subframe. Plan is to get the rear suspension pieces powedercoated, then they can be reassembled, whilst they are out being coated, my plan is to paint any baremetal with POR15, undercoat it with something, and then paint it beige. The shop has a bunch of Wurth Underseal, not the SKS variety, so I thought Id spray some as a test, see if it is acceptable or if I need to order some SKS. both are black, so would have to have a top coat laid on so it looks close to stock. 

Back to the subframe. I bought a bracket kit from Satisfied Incorporated, the Ireland Engineering kits just seemed a bit pricey, and arent without some fitment issues. So I thought I'd try these out. Overall, I'm fairly happy with them, but certainly needed some grinding and fitting. The Camber adjustment slots were not long enough to overlap with the factory height. My method of install was to cut off one bracket at a time, and fit the adjustable bracket in a position that mimics the factory location. Theory being I can always set it to the same place it was, and camber can go more positive from there, to cancel out the effects of lowering, and the toe can go either way. The brackets didnt fit very tightly to the subframe in a few places, necessitating either weld fill, or leaving a strip of old bracket to weld to. the slots are a little oversize, I would guess 1/2" rather than 12mm, and this means there isnt much of the bushing spacer in contact with the bracket. I think it will be fine, but I'd rather a tighter adjustment slot. My plan is to have large washers under the bolts and nuts, and once I have the alignment set, I'll tack the washers to the brackets so theres no chance of them slipping in the slots. Ramble over, on to the photos.

Used a spacer from an old trailling arm bushing to set the distance.

ImageIMG_0677 by Warren Tomlinson, on Flickr

Tacked

ImageIMG_0678 by Warren Tomlinson, on Flickr

ImageIMG_0679 by Warren Tomlinson, on Flickr

Getting to this point, all 8 tacked in place, took far longer than I had thought! But even with a lot of adjustment available, I wanted to be fairly accurate with their placement. I'll admit, they arent 100% perfect, a couple were a bit tight on the spacer, and not 100% square, but overall I'm not unhappy with the result,

Also used my spare arm for confirmation of fit throughout the process. This arm is bent, but not between the bushings, but where the hub attaches to the arm, so it's fine for this function.

ImageIMG_0676 by Warren Tomlinson, on Flickr

Yesterday I got the reinforcement brackets welded on as well

ImageIMG_0778 by Warren Tomlinson, on Flickr

ImageIMG_0779 by Warren Tomlinson, on Flickr

I decided to grind down the welds, they were pretty decent looking, but I had ground out all the other welds holding the brackets on, so kept it consistent. I ended up seam welding the bracing plate between the diff mount and the subframe. I think some peope add extra bracing here for big torque applications, but I just finished the welding where the factory left spaces.

ImageIMG_0780 by Warren Tomlinson, on Flickr

ImageIMG_0781 by Warren Tomlinson, on Flickr

This is the lot of parts going for a nice semigloss black powder coat. Thought about painting them with POR15, but I'd use a ton of it, and my friend gives me a good deal on powdercoating Anyway.

ImageIMG_0782 by Warren Tomlinson, on Flickr

 
AlpinaPat
Posts: 26
Joined: Jan 14, 2025 3:20 PM
Location: Canada

Re: Resurrection of my green BMW

Post by AlpinaPat »

Nice job! I added similar adjustability to my E30 rear subframe last winter - it was a ton of work!
CanadianMiniFan
Posts: 159
Joined: Oct 16, 2011 6:31 PM

Re: Resurrection of my green BMW

Post by CanadianMiniFan »

Got back at it this weekend, started out the day just cleaning up surface rust under the back, to prepare for POR15, and then I got sidetracked. Figured I should sort out the rear valance now, so then i dont burn off POR behind it and have to re do it later. I had the valance cut off a parts car, and figured I could make the bumper delete look cleaner. Started here

ImageIMG_0803 by Warren Tomlinson, on Flickr

This one was easy because it was just a straight even section

ImageIMG_0804 by Warren Tomlinson, on Flickr

Corners were a little trickier as I had to taper the filler piece to the corner, but they turned out fine

ImageIMG_0805 by Warren Tomlinson, on Flickr

ImageIMG_0806 by Warren Tomlinson, on Flickr

While I was under there I kept looking at the swaybar mounts, they were pretty rusty and thin, and thought, if I leave these, theyre gonna fail at the worst time, and you dont really wanna weld in there when the fuel tank is back in. Or at least I dont want to. So I made up some replacement centre sections and welded them in. Looks like the brackets had been reinforced previously.

ImageIMG_0807 by Warren Tomlinson, on Flickr

Filled in the marker light holes too, so one evening this week I can do some paint under there, and then investigate my undercoat options. We have some WURTH underseal cans I could use, black, and then overcoat with SEM beige Ecoat. If the underseal is too thin, or too far off on texture, I'll investigate ordering some SKS underseal, but Id rather use what we already have, not wait for another product. We will see. We have a sprayer with a hose extension so I will endeavour to get undercoat into all the nooks and crannies I can, and then wax after final paint.

ImageIMG_0808 by Warren Tomlinson, on Flickr
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