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Unread 02-05-2010, 07:25 PM
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Fair! Fair! is offline
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Default Re: Vorshlag $2010 GRM Challenge car - BMW E30 V8

Originally Posted by WhiteLX View Post
Could you heat and bend the arm forward? I know there are guys that do this with the early steel I-beams for ford trucks to correct camber issues when raising or lowering (not to the later cast beams though). Not sure how that would effect the strength of the BMW arms since I have no idea what they are made of or the process in which they are made. You could box in the arm after bending to increase the strength.

Probably an undesirable side effect would be a reduction in negative camber and a change in the camber gain since you would also be shortening the distance from the inner pivot to the outer ball joint.
Its an idea we have seriously considered, but yea, it'll likely cost us some camber. We might cut/pie section the arms to bend them forward instead. One way or another we're going to make some LCAs work.

Originally Posted by Matt M. View Post
Fair, the LCA dims are not an unknown quantity. All RWD E30 and E36 LCAs have identical dimensions, with the exception of the 96-99 M3, where the outer ball joint moves ~10mm forward (which is how the 96+ M3 achieves the same outer LBJ position as the 95 M3 in spite of using centered vs offset bushings).

Thanks, we'll try to round up some late E36 M3 arms to test. I'll try anything at this point...

BF group had several alternatives to using the E36 5-lug spindles, including...
Originally Posted by garretvs View Post
E30 M3 front struts & spindles
... are worth about $800-1000 for cores nowadays. Find me usable stock E30 M3 spindles/struts for under say... $300/set and I'll buy every one, sight unseen.

Even if we could magically find a free set of E30 M3 spindles/struts (ha!) they still suffer the same limitations as the E30 4-lug spindles: there are no affordable choices for coilovers. All you can do is use inserts -or- cut off the factory strut tubes and build your own shocks from scratch (which is how AST makes 4200s and all 5000 models. Ever priced shipping spindles to and from Holland?)

We looked into making/modifying/swapping just the E36 5-lug hubs onto the E30 spindles, too, but we lose both the cheap/available/better E36 strut choices as well as the step up to bigger E36 front brakes. We have had multiple free sets of E36 non-M spindles + LCAs + full front brakes donated. Nobody puts much value in this stuff, and its free for the taking if you know where to look. Well this stuff is still a HUGE improvement over the stock E30 non-M front brakes and suspension!

Not a big deal on an auto-x/drag car to get the bigger E36 brakes, but it matters for track use. Imagine a 350 whp V8 powered E30 with 275mm Hoosiers - Do you want to be wheeling this thing around a track with stock 4-lug E30 brakes?? I sure don't. At least with 11.5" front discs we might be able to make a few laps without the brake pads catching fire.

Again, this weird E36 5-lug swap is bigger than our $2010 GRM project - its something a LOT of E30 4-lug folks have wanted to do, and something I wanted to try for years, but nobody has just documented the problems or solutions very well. We're we're going to make it work with correct wheelbase/caster, one way or another, and show it here.


Last edited by Fair!; 02-05-2010 at 07:28 PM.
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