GX-CS4 finally arrived...

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BG3

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Oct 23, 2023
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NEW LONDON, NC, USA
The compressor arrived in excellent condition. Instructions are simple and easy. Based on the reviews, I flushed the cooling system with distilled water several times until the water ran crystal clear. I then let the pump run unstressed for a bit to let everything break-in and "seat" property. I closed the bleed for short periods to add a little stress before actually doing the dead head test. It only took 26.6 seconds to reach 300 bar.

If you saw my previous thread, I was a little worried about the coupler. Upon trying it on the Wildcat MkIII, along with the FX supplied coupler, I dare say, the GX coupler is actually smoother to operate and feels like a better connection. Guess I won't need an adapter for now. But, I now know a good place to get one, if I do!

I have been gingerly shooting the original fill from SPAW. I sighted in with the FX 18.1's, then swapped to the longer rail for the Immersive 14x50 and sighted in for the Atomics. I've since taken three squirrels. I've shot three and a half mags and that got me to ~175bar. I set the stop at close to 232 bar as my eyes would let me. Set the backup at 240. I hooked the Wildcat up to the CS4, turned on the fans, then the compressor. I let it cycle a little, then closed the bleed valve. It built to ~180 quickly. Just a few short minutes later, it hit the shutoff. If the gauge on the gun is remotely accurate, I think that's about as close as I could get. Especially for the first time!

This was super simple and about as painless as it could be, sans the external power pack. For my needs and at $504 shipped, I think I made the right decision. I guess I'm now one of the guinea pigs in this experiment. First tenth on the hour meter. Time will tell so, we shall see...

Thank you to all who have replied to my posts, pm'd, and for the ones who provided the excellent historical content to search. It's made my introduction to PCP's much easier.
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Asher said:
I'm liking mine so far too although I've already blown a few burst disks despite not exceeding 5000 psi. Almost out of the spares it came with, and the extras I had on hand from my air venturi are a wider diameter
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What pressure are you pumping to? If I decide to get a cf bottle down the road, I'd be going up to 250 bar. But, that shouldn't be a challenge for the CS4.
 
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Thanks for sharing.

I have been watching and reading a lot of threads about the GX - CS4 pump and others. After my last set of regulator repairs, when I had to hand pump two guns up from zero, I started to think real hard about getting a direct-gun filling compressor .

I know that starting and stopping these small compressors under a load is very hard on them, just like it is for vacuum pumps. I see you talking about starting it with the bleed valve open, no load, which is a very good thing. However, I see that most people are using the auto shut off to stop the compressor instead of watching the pressure and opening the bleed valve once pressure is reached before shutting off the motor. It just seems to me that opening the bleed valve just prior to shutting down the compressor would be less stressful on these units.

Thoughts?

Feinwerk
 
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Feinwerk said:
Thanks for sharing.

I have been watching and reading a lot of threads about the GX - CS4 pump and others. After my last set of regulator repairs, when I had to hand pump two guns up from zero, I started to think real hard about getting a direct-gun filling compressor .

I know that starting and stopping these small compressors under a load is very hard on them, just like it is for vacuum pumps. I see you talking about starting it with the bleed valve open, no load, which is a very good thing. However, I see that most people are using the auto shut off to stop the compressor instead of watching the pressure and opening the bleed valve once pressure is reached before shutting off the motor. It just seems to me that opening the bleed valve just prior to shutting down the compressor would be less stressful on these units.

Thoughts?

Feinwerk
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Biohazardman always said same thing, start and stop with pressure-release valves open. Never used "set pressure" function on my Yong Heng for that reason, also found running compressor few seconds after opening pressure-release valves expelled moisture. WM
 
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I fill my CF tank to 4500 but my hubens get filled to 5000. The compressor is supposed to be 5800 psi capable. I know starting with pressure is bad but never heard that stopping with the bleed valve open was a good idea.

One thing I like, its setup so that even if the burst disk fails, you don't lose all the pressure that had gone into your tank or gun so far
 
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WorriedMan said:
Biohazardman always said same thing, start and stop with pressure-release valves open. Never used "set pressure" function on my Yong Heng for that reason, also found running compressor few seconds after opening pressure-release valves expelled moisture. WM
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Good to know. Since I'm just getting started, that would be an easy habit to start. I'll just set the auto shutoff slightly higher than needed, then open the bleed valve at my target.

Though, the auto shutoff has an additional safety. It keeps you from having to be right there at the tank/compressor if there were to be a catastrophic failure. While not likely, these tanks are under a lot of pressure and things happen...

Though, it sounds like that's a much greater risk for someone in @Asher 's position, than mine! 5,000psi is a impressive!
 
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At first I didn't like that the power source for using AC was separate, but I like it now, makes the unit smaller and lighter. I do take it with me to the range, kinda have to if I want to shoot my gk1 at full power.

I already had a sound system with a 2nd AGM battery wired in parallel to my main AGM battery, the 2nd is easily accessible in the back. (Its better to have your power wire between battery and amp as short as possible, and 2 batteries gives me capacity to play music for 10 hours without running the engine, hence the 2nd battery in the back. Great for camping) I can set stuff on top of the sub box like guns and the compressor and use it without having to lift my hood, and its covered by my car roof if it starts raining, which has happened. having 2 AGM batteries gives me so much capacity that I can run the compressor without needing the car engine running. Worked out well, would never have thought that my sound system would synergize so well with my airgunning
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