After hours of tedious measuring I was able to punch all of the dimensions into the analysis software. The top view shows the suspension aimed straight ahead and the bottom view shows it mid turn. The red numbers are the intial measurements and the black numbers are the results after modification. Initially I found that my roll center was just over 1" below ground level when going straght and it jumped 41" to the outside when turned. I also had a bunch of camber change.
After raising the control arm inner pickup point by 1.25" and adding a lot of caster I was able to get the roll center up to about 2.5" above ground and it now "only" moves 13 inches off center to the inside. In addition the camber change is improved.
With the planned changes identified it's time to start modifying stuff!
The crossmember was the first to get changed. I drilled the new holes 1.25" straight up. I also welded large washers on the inside like the factory had below.
Next up is making new TC rods. I tried cutting the stock rods, and running a die down it, but that didn't work. Apparantly the stock arms are forged steel and the result was a terrible thread and a much duller die... So, I'll make it from scratch. Above 1" solid bar steel heated and bent.
After machining the thickness, and drilling the holes, I drilled a 5/8" hole in the end and welded a 5/8" bolt in the end.
After welding in the headless grade 8 bolt, I heated the entire part to cherry red and allowed it to cool slowly. Next I bead blasted the scale off and zinc plated them. Here are the finished pieces plus the U bracket for the opposite end
The finished product.
Installed... the control arms are modified stock... cut down with a heim on the inner pivot.
To add to the caster I also relocated the top strut mount back as far as I could
The underside of the strut tower prior to finish welding.
The revised strut towers ready to race!