For those who are new to the 12R5 for carpet racing...
I have done a ton of testing lately and I want to share what I have learned about the front end setup. I have always liked 10 deg reactive caster on other cars in the past. The R5 has some wicked steering. I have tried every combo while learning about the car. I like a 5 degree angle with the lower arm spaced out 1mm on each side. No spacers to make the upper arm longer. My car is dialed with this setup. Smooth at high speed and entering the corner without pushing, then lots of middle-exit steering.
Everything else on the front end is stock. .20 springs with stock kingpin shims...3.25 upper arm spacing..be sure to make your rear width 171-172mm..
If you havent already, it is worth a try.
