PCP General Question

[450BM]

This question is about my FX Impact.

I had a full fill of 250 bar. After the first 28 shot magazine I noticed I was down to 200 bar and thought ”wow, I won’t get 100 shots out of this”. The next mag took it down about 30, and each additional mag went down less. I stopped at 100 bar, where the 2nd reg is set and that was 5 mags (140 shots). I didn’t have the chronograph setup and was only watching for an impact change on the target which I didn’t see.

Is this normal to use more air when tank pressures are higher? I’ve left it filled for several days with no change in pressure so there doesn’t appear to be a leak. No complaints about the number of shots, just seemed odd.

 

[jmohme]

Dont trust the gauges.
Set up your chronograph and go by what it says.
The only thing you can rely 100% on about gauges is that they are usually unreliable.

 

[JungleShooter]

Don't trust the gauges.
The only thing you can rely 100% on about gauges is that they are usually unreliable.

I'm so greatly encouraged to buy a gun that costs over 2 grand —
but the makers still don't include a reliable pressure gauge....

Matthias

 

[BackStop]

This question is about my FX Impact.

I had a full fill of 250 bar. After the first 28 shot magazine I noticed I was down to 200 bar and thought ”wow, I won’t get 100 shots out of this”. The next mag took it down about 30, and each additional mag went down less. I stopped at 100 bar, where the 2nd reg is set and that was 5 mags (140 shots). I didn’t have the chronograph setup and was only watching for an impact change on the target which I didn’t see.

Is this normal to use more air when tank pressures are higher? I’ve left it filled for several days with no change in pressure so there doesn’t appear to be a leak. No complaints about the number of shots, just seemed odd.

What caliber is it and how do you have it tuned? FPS/FPE/Etc

Caliber and tuning can make a HUGE difference in shot count.

If you have it tuned for max power, then you are not going to see max shot count.

Tuning to the "knee" will give you the best of both at any given power/regulator setting.

So, if you can adjust your regulator, then you can find the ultimate "knee" for the fps/fpe you need with a given pellet.

Sorry, don't have a link handy right now, so look it up. (smile)

 

[450BM]

Dont trust the gauges.
Set up your chronograph and go by what it says.
The only thing you can rely 100% on about gauges is that they are usually unreliable.

I need a new chronograph that is easier to setup and more reliable. My old one, a Chrony, works well when all the stars are lined up right… All three gauges read the same but that’s all I can say right now, pcp’s are still really new to me.

 

[JimD]

The $30 Chinese Chronys work fine. I have a clamp on and one that can be mounted on a tripod. I prefer the latter. I almost always get a reading and when they start looking odd, it needs recharged. I used to have a conventional Chronograph but I shot it one too many times and it doesn't work anymore. Getting the right light level to it was a challenge.

 

[hawkeye69]

My M3 Impact does the same thing. From 250 down to around 200 is pretty fast; from there the pressure drop is much slower. Great gun, I get over 150 shots per fill, but the gauges aren't worth much.

 

[sb327]

MOST mechanical gauges are good at reading in the center of the scale. It was the area they are intended to work the best. The further we get from center of gauge scale, the less reliable.

Also, miniature gauges are more like indicators than they are actual gauges, jmo.

If you want more reliable readings, a larger gauge (liquid filled) or electronic would be needed.

Dave

 

[TheCarFather]

I notice the exact same phenomenon on my Maverick. I'll get roughly 20 shots from a full 250bar fill down to 200bar. Then from 200-150bar I'll get about double that, around 40 shots. I haven't measured exactly, but it definitely loses that first 50bar of air pressure quickly when shooting, and settles down around 210-200bar.

 

[450BM]

Thanks guys, I guess I won’t worry about it!