First off the car:

2005 MCS with LSD, JCW kit, R-Speed 22mm Sway (currently on medium), H-sport lower rear control arms, Helix/RDR camber plates and the stock springs and shocks.

Given the above what would the optimum alignment parameters be for the front/rear toe/camber etc. for AX? In addition, what would a good compromise setting be for the rear for street/AX? The front I'm not as worried about since I can throw the camber around up there.

The surfaces that are most prevalent is a medium/high grip asphalt with little.. hills and dips. The asphalt also has seashells mixed in, and is vegetated and in pretty bad shape overall. (Monster Park, SF CA). The other surface is concrete like you'd find at an airport (think Atwater and you'll know what I mean).

I still have the coilovers to deal with and the car is pretty well sorted and hopefuly competitive (it's just me that needs tons of work), but I'm looking for a good baseline for the alignment, since mine is a bit wonky right now I think.

Thanks,
Carl

 

Since you have camber plates, you can adjust the front camber by taking tire temps with a pyrometer (do you have one?).

Don't worry about having too much camber on the street. Camber doesn't wear tires out, toe does.

So a good "compromise setting for street and autocross" would simply be one that allows the car to balanced at the limit without using much toe to achieve it. Too much toe = more than .9 degrees total (front or rear). So that leaves you with the following adjustments to acheive the correct balance:

Camber
Caster
Ride Height
Sway bar settings
Spring rates
Shock valving/settings
Brake bias
Tire pressures
Track width (wheel spacers)
Tire size
Wheel diameter

Good luck!

I'd recommend:
Camber: 2-3 degrees negative
Caster: maximum (at least 4 degrees....preferably more)
Toe: Front 0.5 out / Rear 0.5 out

Here's a link to help you with tuning the other stuff:

http://www.wtrscca.org/tech.htm