Do you like your lowered x? How did you do it?

[TriX5]

The gas law is true for a given number of molecules. Since you release air from the bags to go down and pump air in to ride higher that would not be the correct formula when you raise or lower the car with the compressor.

When you lower the car V changes because the bag reduces in size where it rolls in around the lower support. Both V and the number of atoms change. My argument was that the Pressure remains the same. The ride height changes because you add or release air.

However, once the ride height is set then you are right. The number of atoms is constant. When the car hits a bump the wheel goes up and the volume of the bag becomes smaller, the pressure in the bag goes up. However, when the car is steady state (for example sitting still) then raising or lowering the car will not appreciably change the pressure in the bags.

So, for the sake of argument, if the total amount of air contained after lowering 20mm would be 5 or 10% less your spring rate would go up by the corresponding amount. I am not sure about this estimate but it should be somewhere around that. I think a 10% increase in spring rate would be hard to sense in the seat of the pants but maybe it is.