Nova Liberty reg adjustment direction

You moved it the right direction. How much did you move it? What grain pellets were you pushing at 950? Quite possible you dont have enough hammer energy to crack the valve open with the higher reg setting. 950 is a little hot for most pellets.

The reg likes to creep on the nova. Did it start out low and fps climb with each shot? If so...it will need more shims behind the spring.

Blue, what is your goal? You were tryin to get the 18s to 900. Now your working with 25's. Haven't seen too much luck with 25's in the nova. 21 grain cudas and 18 jsb. Ultimately, you want to back off the hammer spring 3 to 5% off max velocity for best efficiency. If you're speed is too low at that setting, bump the reg, find max and back it off 3 to 5%

Well, I suggest finding out which pellet your gun prefers first. And then tune it to that pellet. If you set it up to shoot the 21's at 900 its going to push the 18's too fast. A general rule is 880 to 900 fps. Pushing them faster accuracy starts to fall off. There are exceptions....but start there. Accuracy always wins over power. Before testing for accuracy, scrub that barrel with a brass brush. You've been pushing them pretty fast and i can almost guarantee you have some leading in the barrel. Mine does when pushed to hard and accuracy suffers.

I would leave the AA as is. You can reg it...but not that easy to tune afterwards. Mrod all the way. Huma reg, aftermarket valve and lightweight hammer. You can tune that one from mild to wild.

Also you mentioned you want to tune for efficiency, that’s a different tune that for power, and you started by increasing the reg pressure. I agree 100% with Rj, find your pellet, then start tuning. Also it depends for your application.

I’ve seen almost everyone that gets the Liberty, at least in the forum, wanting more power. Have you seen my video on the shotstring? I don’t know if I’ll change the setting on mine. I’m having really good speed as is and shot count. My application will be hunting, if you are plinking then at what distance you want to plink? Some pellets will do better beyond 50 yards than others and past 50 yards you will need the power increase, but for example I know that the CPHP suffer in accuracy if pushed too fast. Slugs on the other hand needs to pused fast,at around 900. 

Hope this helps, there are a lot of variables here, and that’s what makes this interesting, everyone has a different goal, find yours and have fun trying to achieve the best results.

You are turning the reg adjuster the right way, but after so much you are just wasting air.. That is why no increase in fps ... Adjust the hammer spring until no more increase and then take out a thin shim to back it down.. After that adjust your reg to the pellet ..

You are turning the reg adjuster the right way, but after so much you are just wasting air.. That is why no increase in fps ... Adjust the hammer spring until no more increase and then take out a thin shim to back it down.. After that adjust your reg to the pellet ..

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He.actually lost 150 fps by turning it up. Not enough hammer energy to open the valve at the higher pressure.

Well, I don't know of one. But you could probably make one. You would have to find out the plenum thread size and go from there to a gage. Wouldn't operate the gun properly, but would read reg pressure.

You would have to test with stock off, or drill through stock to accommodate guage. Most guys running a guage can machine a part at their shop. Some are machining larger plenums with threads to fit a guage.

You can get a close estimate by shooting a string of the same pellets & watching your chrony for the drop off, then read your tube pressure. If your slinging the 14's @ 990 your probably around 2600, so start above that. Try starting at a fill of 2900 and shoot 2 mags or so. Give the same recovery time between shots (15 sec) check reservoir pressure after every 2 shots. You'll know when you drop off the reg. That will put you close. 

Don't forget, they need a little break in time, some will drop "fps" without doing anything, and they seem to be tight strung. If your heavy pellets have a larger head size, they will be disproportionately slower. They seem to favor smaller head size. Pull your barrel and do a push test with some different head sized pellets. You'll really feel the difference. Good luck Buttercup ahhhh, I mean Bluecup.