First, while the GM service bulletin specs are nice for reference, one quick look at the T2 and SSB Solstices show that NONE of them are running that way. Even the factory C/S and A/S Solo cars that ran the Nationals in 06 and 07 ran a lot more camber than that. Additionally, for Solo use the toe specs are worthless. Again, for Solo, zero toe f&r is the best place to start. If someone wants to adjust this at events, it is fairly easy, and I can go over that if someone would like. For road racing, people should get some input from people that have more knowledge, but fine and certainly smaller, adjustments would seem logical. After all, mistakes at 45mph mean a quick 180 while a mistake at 100mph could result in some drastically bigger results!!!
Second, as the rear suspension moves through its travel, the toe and camber does change, thus caster will also change a bit as well. Running springs in the range of the Z0K rates at road course speeds would probably result in a good bit of travel. Having the rear caster set properly would mean a more predictable "set" to the suspension. The factory tool is available from time to time on e-bay and elsewhere for under $100. It might be a good thing to have for the best adjustment of the rear. Around a major metro area (like DC) the cost could be shared with the tool being passed around as it is needed.
