Originally Posted by Razathorn

The primary driver in the car is the rear spring. The looser the track, the softer the spring you really need, starting at AE green rears. The more traction available in the rear, the stiffer spring you can run and the more steering you can achieve, especially on power. Generally speaking, you should run greens on a track that gets very loose, whites on tracks that hold at least medium grip, and you may find yourself running gray if you're on a very high bite well maintained track. I always keep green and white rears available.

After determining how stiff of a rear spring you can get away with, you will need to pick a front spring. In my opinion, this is primarily based on which rear spring you run and how much rear traction under deceleration you need. The stiffer REAR you run, the stiffer front you will need to run to keep traction when braking or general corner entry. If I run green rears, the softest spring I will run in the front is black. If I run white rears, the softest spring I will run in the front is green. If the track has a section where the car wants to become loose under deceleration or corner entry, I will try going one spring stiffer in the front before I go softer in the rear.

My starting point is black front green rear on a loose track. If I need more traction, I go to green fronts. If the car is really hooked up and wants to push on power, I will try my medium to high grip initial setup of green front, white rear. I generally don't go stiffer than green front. I will tend to go up a half weight or whole weight in oil in the front if the green front springs cause the car to get a little twitchy / over responsive in the front.

Wayne