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The syntax of your question is a bit odd, which is why you've never seen it asked before. You're asking for a value that is not easily calculated, when you consider that AEGs are powered by electricity to crank a spring-powered piston. Compression occurs between the piston head and the cylinder head and is then ejected through an air nozzle.
The power source is mostly in the spring, but the "psi" output is also highly dependent on the piston head.
Airsoft guns typically have their output measured at the muzzle in FPS - a reading of the velocity of the projectile as it leaves the barrel in feet per second.
Automatic Electric guns in Ontario are typically limited to 400fps at outdoor fields (it could be higher or lower, depending on the game host) and that measurement is made with 0.20g BBs and the work put on the BB is 1.48Joules.
Because gas weapons register output differently as the weight of the projectile goes up or down, here is a general limit of calculations you should be measuring with:
If you are shooting a 0.12g BB, 1.48 Joules of output would be ~ 517fps
If you are shooting a 0.20g BB, 1.48 Joules of output would be ~ 400fps
If you are shooting a 0.23g BB, 1.48 Joules of output would be ~ 373fps
If you are shooting a 0.25g BB, 1.48 Joules of output would be ~ 358fps
If you are shooting a 0.28g BB, 1.48 Joules of output would be ~ 338fps
If you are shooting a 0.30g BB, 1.48 Joules of output would be ~ 327fps
If you are shooting a 0.36g BB, 1.48 Joules of output would be ~ 298fps
If you are shooting a 0.40g BB, 1.48 Joules of output would be ~ 283fps
If you are shooting a 0.45g BB, 1.48 Joules of output would be ~ 267fps
FPS is typically measured with a chronograph.
You'd have to fire through a chronograph while adjusting your PSI accordingly to meet the field regulations.
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