3000 psi tube QB78

[remtom1200]

I finally give in and ordered the PCP conversion and the hill pump from Eric...no rum and beer for me for ...ever....lol. Now trying do pick through a million posts about tuning this type of conversion mostly to avoid a locked valve while utilizing more psi. Now I see I have to pin the valve for safety as well. Now this is my type of happiness...MODS!

[SeanMP]

Agreed.

You are flowing huge amounts of air that's not doing any work. My best advice is return all the springs back to stock and see what you have.

Usually the valve needs some custom work on the inlet side to make use of any spring mods. Yes it will flow air but the openings are restrictive which causes a huge pressure drop in the valve. So the large flow is not effective.

Here is a treatise by the Master of Volume and flow

http://www.airgunhome.com/agforum/viewtopic.php?t=7674