Greater than 60 PSI

[Matt C]

IF you had a mechanical device strong enough to produce increased pressure in a standard pneumatic cylinder, check out specifically rule <72>, part I.

I. For the purposes of the FIRST competition, closed-loop pneumatic (gas) shocks are not considered pneumatic devices, and are not subject to the pneumatic rules (although they must still satisfy all other appropriate rules).

Just trying to give a friendly push in a productive direction. I'm not exactly familiar with the types of closed-loop shocks out there, nor do I know what you are trying to accomplish with your increased pressure.