OK I will share with you what years of real racing we have learned to work on the DRVOLKS.com Beetle .
Below is the car with many round of testing and retesting an make up the parts as we go.the roll center as it is now!
to get it to this point one of the biggies add on was the tall lower ball joint
I am working with other Chump VW teams to test what I have found to work.
below is the work that had to be done to get the roll center to work. and my drivers are all real race car drivers not want to be,s so the feed back on it from all drivers at WG is is was the best handling car they had ever driven!!!
Ok I would gladly help
The ball joints are from Speedway parts but the screw tube bottoms to weld on your lower A frames
make shore you check your camber and the axle because you can pull the axles out of the inner cup.
Buy the reamer that matches the taper .
You must mock up the rotor and hub tight and machine the lower ball joint hole off center so that the ball joint screw tube dos not hit the rotor. and recheck after you are done with no springs to make shore the ball joint do not hit the rotors as the swing up/down
How I did it was take the spindle mount it in the brige port with the old ball jount hole at the top and the top of the spindle that the strut gos through is pulled tight to the table the angle was just about right. You may need to shim and use a end mill to punch it off center a bit. it will not follow the stock hole angle . start small and use the reamer with a hand drill so just the bottom thread is below the finished hand grinded part after I was done I had to hand grind the part where the nut pulled down to clear the nut and at a 90deg to the ball joint and cut the top of the ball joint sticking up from hitting the CV joint
I used TT lower control arms forged .
If you give me all the measurement as in the rollcenter jpg i will do the math for you. or just buy his program
I had to cut off 1 inch of the top of the sub frame too this point was 40 HR
I run no sway bars
Then you will need to do bump steering fix after all this work read up on that
What I had to do 19 hr later is cut the bottom of the rack 3/8 and cut the tie rod end off the spindles and swap left for right and weld them up 5/8 of a inch up.
below is the car with is new rubber 275/40/17 on 9.75 rims all corners
This is as I know the biggies tire ever put on a VW plate form like mine that really races and it worked.
Bob Mann