Rear trailing arm upgrades

[JGood]

Has anyone installed an aftermarket or custom trailing arm system? This would be for a track car. I know the M3's had aftermarket arms available that allowed for about 3 degrees of less camber gain when the spring was fully depressed. Does anyone still sell these? Would this be an actual benefit to a relatively stock 325is? By relatively stock I mean one that runs a normally mounted spring/shock/sway bar.

I'm guessing the stock trailing arm setup should be good enough, just curious if anyone has any leads on a superior design. I'm picking up an 87 325is to build as my track car and want to do it right the first time.

[E30Driv3R]

Sorry for no input, but i have been wondering this also.

[matt]

I don't think any sort of adjustable control arms have been "available."

They have been made, but not on a production "order from a catalog" basis.

[JGood]

The Gruppe A arms for the e30 M3 were adjustable for both camber and toe, and had less progressive camber as the spring compresses.

I'm just looking for something like this, without the price tag. I understand it will likely be custom, just looking for some input from anyone who has done anything like this. And if the time/$$$ was worth it from a performance standpoint.

[matt]

Group A rear trailing arms have never been anything close to "available." Also they won't change the camber curve just by being able to adjust for camber and caster... to change the camber curve you need to change the rear subframe's angle that it attaches to the trailing arms.

If I were doing something like this, I would just install the whole e36 rear suspension. It's a better design all around than any sort of semi-trailing arm. The other option would be an e28 rear suspension... it will accomplish exactly what you're looking for in terms of changing the camber curve. This has been done.

[JGood]

Thanks.

Do you have any specific info or links on the e28 swap? I've never seen anything on this, but will start looking around. I could pick up an e28 cheaper then dirt. I already have an e36 rear suspension just collecting dust though...

[matt]

Here you go: http://forums.bimmerforums.com/forum...suspension+e28

[JGood]

Awesome, thanks.

I need to spend more time on that board.

And r3v of course....:D