FX How close to regulator pressure.

[jagbender]

I have a FX Maverick .25 caliber. I was wondering how close to your regulator pressure do you let your air bottle pressure to drop before you notice reduced velocities?

My 2nd regulator is set for 135 bar. the upper pressure is 155 bar.. I have been refilling at 200 bar. Should I shoot until I get closer to 155 bar?

Thanks

 

[TwoLoe88]

You can shoot down to 135 per the techs at FX.

 

[Emu]

The only rifle that I own that prevent you not to shoot under regulator preassure under no circumstances is the Sidewinder.

Apparently if you do so, a technician from NASA living at the Space International Station has to be called to make it work again.

 

[nervoustrig]

I was wondering how close to your regulator pressure do you let your air bottle pressure to drop before you notice reduced velocities?

It just depends. If the hammer spring tension is adjusted for about 95 to 97% of maximum velocity, you may not see the velocity taper off until the pressure has fallen somewhere into the ballpark of 10 – 15% below the setpoint.

Whereas if too much hammer spring tension is dialed in, the velocity may drop like a rock as soon as the pressure falls below the setpoint. Or if too little hammer spring tension is dialed in, the velocity will instead begin to climb before turning around and heading down.

 

[qball]

In my FX I usually will fill my guns at about 15-20 bars above the regulator.

 

[Ca_Varminter]

You can shoot to the Cutoff pressure of the 2nd Reg..... No Harm No Foul....
If you are in between shots..... anytime your bottle pressure drop off of the 1st reg.....
Go ahead and give a fill..

 

[Mike Kunte]

Great question, Jagbender!

I've recently been asking myself the same question. I was experimenting with a new tune on my FX Maverick in .22 cal, with 170/130 settings on 1st and 2nd reg. Filling to 250Bar on the bottle, I could achieve about 2 - 3 mags (18 rounds of .22) before reaching the upper pressure setting. Then I thought to myself - why can't I shoot down to the 130 bar (or perhaps just above), since this is the actual pressure at which the gun is firing... I would still need to chrony the slugs near the bottom pressure to see whether I'm losing muzzle velocity.

I don't know that the gun would become damaged going below that bottom reg pressure. I doubt it, but would rather not take the chance. The only downside I could see is that the plenum could take a lot longer to fill, since the pressure differential between 1st and 2nd reg is much lower. Any thoughts on this?

Mike

 

[jagbender]

Great question, Jagbender!

I've recently been asking myself the same question. I was experimenting with a new tune on my FX Maverick in .22 cal, with 170/130 settings on 1st and 2nd reg. Filling to 250Bar on the bottle, I could achieve about 2 - 3 mags (18 rounds of .22) before reaching the upper pressure setting. Then I thought to myself - why can't I shoot down to the 130 bar (or perhaps just above), since this is the actual pressure at which the gun is firing... I would still need to chrony the slugs near the bottom pressure to see whether I'm losing muzzle velocity.

I don't know that the gun would become damaged going below that bottom reg pressure. I doubt it, but would rather not take the chance. The only downside I could see is that the plenum could take a lot longer to fill, since the pressure differential between 1st and 2nd reg is much lower. Any thoughts o

I just ordered a chronograph and will be doing some velocity testing too.