So I have done a bit of research, and am seriously considering retro-fitting the e82/e90 rear multi-link into the e30. Seems like a great way to eliminate the inherent flaws of the stock rear suspension in one swoop. That said, it does involve quite a bit of fabrication, so its probably not the best or recommended route on a $$ or time basis. But hey, hobby time is different!
This has been already done on the Piper motorsport Franken M3, so the route has been charted, and I will probably follow that. I do have a complete rear clip from an e90, so grafting that in is one option, but it is a bit more complicated, in that the e90 uses high strength steel in different places, which makes welding it a bit more complicated, not to mention the differing steel that would be present which might introduce other problems.
So, seems the best route as of now is to remove the inner wheelwells, and nearby frame, and then weld in a fabricated frame from 3" square tube that the e90 subframe will bolt to. The one downside I see is the rear track width will be increased approx 2.0", necessitating flares. Also probably a good chance the rear seat will no longer fit.
Anyway, I will post up some pics when I get a chance, and am open to any comments. I currently have the existing rear subframe and gas tank removed, but have not cut out the frame yet, as that is a point of no easy return.
This has been already done on the Piper motorsport Franken M3, so the route has been charted, and I will probably follow that. I do have a complete rear clip from an e90, so grafting that in is one option, but it is a bit more complicated, in that the e90 uses high strength steel in different places, which makes welding it a bit more complicated, not to mention the differing steel that would be present which might introduce other problems.
So, seems the best route as of now is to remove the inner wheelwells, and nearby frame, and then weld in a fabricated frame from 3" square tube that the e90 subframe will bolt to. The one downside I see is the rear track width will be increased approx 2.0", necessitating flares. Also probably a good chance the rear seat will no longer fit.
Anyway, I will post up some pics when I get a chance, and am open to any comments. I currently have the existing rear subframe and gas tank removed, but have not cut out the frame yet, as that is a point of no easy return.
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