Quote:
Originally Posted by mr_240sx
how much caster would i need? i know its a vage question but i dont really know what caster does so thats why..... caster move the wheel towards the front of the car? 
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How much castor? Depends on how low you are and how much of a problem you have with hitting the wiring harness or firewall. With my kts on full low and 235/40s and stock castor, I had no problems with hitting the harness. This is because I relocated it to the engine bay, and made a custom plate covering the small portion of it that went from the firewall to the hole leading to the engine bay. The plate kinda tucked the harness flush against the firewall, and I never even rubbed the plate. Again, this was with only like - 7.5 degrees castor (stock at that ride height).
Castor is the measure of the inclination of the strut when viewed from the side of the car. Castor determines the amount of camber gain per degree of steering angle. The more castor you have, the more camber you have at full lock.
I'm running like 8 degrees castor with my spl rods, but could go up to around 9.5. I have tons of firewall clearance now.
Buy yourself some adjustable front tension rods and just play around with the settings untill you find one that gives you the clearance you want.