The way I understand it, and I am by no means an
expert on the subject. You select an air spring that will give you pounds of compression you are looking for at the ride height you want. By nature an air spring is progressive, more compression the higher the rate. What makes the air spring so cool is when you are not thrashing around the track or street you can air them down and get the cool low look, air them back up and drive off. You do not drive it to the track then lower it 3 inches to drive fast...
There is also benefit in a little tunning at the track. Adding or subtracting air to dial in the handling characteristics...kind of like putting wedge in a Cup car on the fly. When ART had Boris Said drive one of their cars he bumped up the pressure in the rear to get the car better suited to his driving style.
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