Originally Posted by robthebuilderer
I cannot speak to how the QL system rides or operates since our Jeep was a steel spring car. I can speak to how our Jeep rides and how the system operates and what you say here doesn't apply to our setup...
We don't have 220psi available and we're getting more lift than a QL Jeep. I'm no engineer or expert air suspension guru...I only know about our Jeep.
Likely because even though the system is pressurized to 220psi, it is not sending the full 220 to each strut/bag. At 'full height' it is probably at 150psi lets say. There needs to be a safety factor calculated into the system. If it would reach equilibrium from tank to strut, the compressor would never stop running. The compressor moves just enough pressure to get the vehicle to a specified height, via the feedback from the height sensors.
Hence why I say to sit at a certain height, the strut/bag needs the same pressure whether its oxygen or nitrogen. That's how air springs work. Obviously the more weight you apply, the higher the pressure needs to be to maintain the same height. This is why when you load a trailer down, the Jeep will automatically transfer more pressure to the springs to maintain the height in the factory setup.
Nitrogen is used instead of oxygen because it doesn't expand/contract with change in temperature as much (which would undesirably change the pressure and increase/decrease spring rate) which is advantageous in a closed system.
Not trying to argue, just giving readers food for thought.