The lower control arms on 240's are meant to fold up in the event of a front end collision which means that they are pretty flexible and it seems that everyone boxes them to increase the steering sharpness. My car also had no ability to have camber - so I decided to just lengthen the ball joint mounting point as this is the cheapest way to get a lot of camber. With my recent foray into the world of autocross, I either lengthened my LCA's or buy new front tires a couple of times a season (yes, it was that bad).
After chatting with a few people about this, the magic number seemed to be 40 mm. So with this as the basic design, on I went with the fabrication.
First up, build an extension piece to TIG weld onto the front of the existing LCA. This required some metal origami in my press - getting it perfect is a matter of patience, practice and measuring twice. The flange (short return at the base of the bracket) was considerably longer, I then cut it to match the width of the existing. This made fabrication easier.
I then mocked up a ball joint to reference the holes and move them the required amount out. Drilled the holes and created a stud for the rear ball joint mount. Then I cut boxing plates from 16 gauge steel and welded them on. It looks like this when done. Don't forget to give yourself a generous hole to bolt on the rear of the ball joint bracket.
For the front ball joint mounts - you need to cut the boxing plate back a little to get full nut access.
Send the finished product out for powder coat and they're done.
This moved my suspension from zero camber to -3.3 degrees. This is as little as I can get, so the 40 mm is probably a little too much. I've got the original LCA's and may fix this little issue to get around -2 degrees as this may be a little too much camber.
I can tell you that the front end grip at this angle is very good. Only tire temps will tell and we're racing this weekend. Wish me luck.
Oh, and I changed out the tie end rods to a new set that I cut and lengthened...don't try that at home with a little buzz box - that's a job for TIG welding.