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Old 06-27-2012, 01:36 PM #1
Eriik666
 
 
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PGP velocity issues (AC, bottomline kitted i.e hpa)

Hi, I've some velocity issues. My pgp won't go above 195 fps or so.

The back adjuster is screwed in to max, I changed the bolt o-ring in case pressure was escaping from there and I cut the valve spring half a turn.

The pgp is kitted to run on hpa (800 ish if I recall, CP reg)
I use a steel hose, so don't think the pressure would be gimped there.
I had no rollouts when I tried, paint fit pretty tight.

How much can I cut the valve spring? I'm worried that it might not seal properly if I cut it too much.

I read that a cartridge setup might cause some problems with constant flow as the CO2 opener (hammer? dunno whats it called) could block the airflow, thus only releasing the chamber pressure.
Can I remove the CO2 opener?

Thanks in advance

Last edited by Eriik666 : 06-27-2012 at 02:15 PM.
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Old 06-27-2012, 02:30 PM #2
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I was gonna come in here and say paint to bore match but no roll outs so... my guess is its a springing issue.
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Old 06-27-2012, 02:48 PM #3
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Well, I guess I'll have to get me some more springs.
Annyone know about the cartridge valve not working well with constant air?
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Old 06-27-2012, 03:05 PM #4
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Screw it, ordered new springs now.
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Old 06-27-2012, 04:56 PM #5
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Let us know if that works out.

I have no doubt that it could be choked off using HPA instead of CO2, unless it has worked for you on air before.
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Old 06-27-2012, 05:08 PM #6
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Nope, hadn't shot it before.

This guy seemed to have the same problem with constant air, but there was no conclusion http://www.pbnation.com/showthread.p...t=pgp+velocity

Read on MCB that the puncture pin (there's the word) might get in the way for the airflow.

Well, I'll update you when anything new happens.
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Old 06-30-2012, 04:27 PM #7
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Just a couple of questions to ask you.

Are you using the older PGP or the PGP2k1?
Bottomline setup using the constant air or through a dummy 12 gram/NPT port?
Rear velocty adjuster, is it a standard one like a Palmers or something home made?

Brass paintball markers are geared toward CO2 usage. HPA doesn't have the expansion properties that CO2 has. With that being said, I have no clue how old your PGP is. Over time, the PGP mainspring loses its strength and becomes weak. You pair a weak mainspring with HPA and you're bound to have low velocities like the one you are having.

The best and easiest fix is to get a new mainspring.

After getting a new mainspring, switch to CO2 unless you are completely against it. If you are against CO2 usage, back the RVA screw out a bit and shim the spring using washers/etc.

Another thing too, while you have the thing gutted, clean out the bottom and middle tube, and swap out the orings on the cartridge valve.

With all my brass based markers, PGP, KPs, etc. I can have it chronoed to 280FPS and when swapped over to HPA, it'd drop a good 40+ FPS.

Hopefully that helps.
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Old 07-01-2012, 08:52 AM #8
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It is the older PGP.
I bought the Palmers constant air kit, so through the front where the 12g should go.
Palmers RVA.

To be true, I don't know how old it is exactly. It's likely that the hammer spring is worn out.

Valve orings are fresh.
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Old 07-01-2012, 01:49 PM #9
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Try Co2, to be honest I've never had good luck running older sheridans with compressed air.

But also check your regs out put..... it may be off.
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Old 07-02-2012, 11:52 PM #10
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Quote:
Originally Posted by Eriik666 View Post
It is the older PGP.
I bought the Palmers constant air kit, so through the front where the 12g should go.
Palmers RVA.

To be true, I don't know how old it is exactly. It's likely that the hammer spring is worn out.

Valve orings are fresh.
Get a new hammer spring.

You can only up the velocity via the RVA only so far. After a point, it doesn't have much effect.

In all truthfulness, get a 4oz co2 tank and that should solve most of your problems.
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Old 07-03-2012, 08:20 AM #11
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Spring on the way.

CO2 will be the last option I'll consider, if I have to.
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Old 07-03-2012, 10:59 AM #12
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I wonder if the problem is that the PGP is a "rimfire" Sheridan and that small exhaust port is choking everything off.

Honestly, running it off a 20oz CO2 is the first thing I'd try, though I'm surprised you have a regulator on the gun... or do you mean that the CP reg is on the tank?
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Old 07-03-2012, 12:19 PM #13
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CO2 just doesn't seem to be as available anymore. Yes the tankreg is cp, no regs inbetween.
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Old 07-04-2012, 05:46 PM #14
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Received the spring, it seems stronger. Unfortunately, I drained my last pressure while attempting... experimental stuff.

Will try this out tomorrow.
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Old 07-05-2012, 05:13 PM #15
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K, so I aired it up, and it didn't seal. I changed the valve spring for a stronger phantom spring.
It did seal and I got it to shoot at 220.

I did however use a diferent tank and reg (ninja), because mine ended up with a worn oring.
What is the default pressure of a ninja pro reg?
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Old 07-05-2012, 07:48 PM #16
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Ninja regs output at 850ish stock, which is about as high as you'd want to put into a brass gun.

CO2's phase change properties are what makes it work better in tight spaces like the PGP.
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Old 07-05-2012, 07:52 PM #17
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Yea, seems like CO2 is what I'll have to go with now.
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Old 07-06-2012, 08:51 AM #18
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I changed the valve from a newly bought one to the old I had in it.
Raised the fps by 20
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Old 07-06-2012, 07:47 PM #19
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Interesting.
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Old 07-08-2012, 06:17 AM #20
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Woo! I solved the issue.

I cut away the puncture pin from the valve, that thing is blocking alot of air.
I got it to shoot above 300, and was able to adjust it to lower velocities.
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Old 07-08-2012, 07:36 AM #21
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