A-5 - Low Velocity when using HPA - Paintball Forum - Paintball guns and gear forums

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Old May 21st, 2006, 10:32 PM   #1 (permalink)
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A-5 - Low Velocity when using HPA

Hello all,

I have seen these threads before...but have never seen a good solution.

I have an A-5 and so do 2 other friends of mine. We have just converted from CO2 to HPA. We have 4 differnt HPA tanks. I actually have 2 - a 68 3000 Pure Energy preset at 850psi, and a Nitro Duck with adjustable reg. All of us are unable to get a velocity of over 250fps.

Note, we have NO problems on spyders, ions, or shockers when using all 4 of these tanks! We maintain all of our guns very well, and I myself own 2 spyders and an ion...and none have this problem. Also, co2 gives NO problems

Here is what we have all tried on all 3 different a-5's:

1) Velocity screw all the way out - No improvement
2) Clean and oiled (with light weight oil) - No improvement
3) Polished internals - 1 gun had an avg increase of 5fps. The other 2 guns
had an avg increase of 3fps.
4) Maddmann spring kit - Red spring - about 4-5 fps improvement for all 3
guns
5) Trinity Spring Kit - hard spring - same as maddmann results
6) Different HPA tanks - No improvement
7) Adjusting output pressure b/t 700 and 900 psi - No improvement
8) BB in the end cap - No improvement

Basically, we have tried most everything that a normal person would have tried. And we cannot surpass an avg of 250fps on all 3 guns

What else can i try? Has anyone run into this problem and found a solution that does NOT involve a Low Pressure Kit (which is very expensive) ???

Any help would be greatly appreciated.
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Old May 21st, 2006, 10:53 PM   #2 (permalink)
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My friend and I are running into the same problem, so i would also like to know whats going on.
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Old May 21st, 2006, 11:03 PM   #3 (permalink)
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Hmmmm.. I have no idea.. But i would email or call tippmann... They should have a solution to your problem.. or if that fails some wise person on this site will give you a solution(maybe)
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Old May 25th, 2006, 05:11 PM   #4 (permalink)
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No answers huh?
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Old May 25th, 2006, 06:16 PM   #5 (permalink)
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Can't give you a cure, You've gone through a good number of things already.

But... If you haven't alread, look at all the air passages. Maybe some teflon tape or loctite got sucked into one of them. Clean them out if possible

You could enlarge the hole in the ASA for better flow. Be sure to clean all the chips out of there afterwards.

Do the other guns have the expansion chamber kit? On the 98's some of the extra pipe supplied had 'less than perfect' fitting connections and the flow could be helped by knocking the inside edges down with a drill. In my experience it wasn't a bad problem and you only did it if you needed total performance.

Maybe you can gut the expansion chamber, make it into a gas through grip. If the velocity goes up when it is an empty chamber you've found the bottleneck.

Just some ideas. Good luck.

I could try to explain it by saying that CO2 is a heavier gas or that with the CO2 you might be getting a small amount of liquid that as it expands gives the extra velocity to get above 250. But really that may not hold any water at all.
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Old May 26th, 2006, 02:53 PM   #6 (permalink)
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how can you "convert" to HPA? all you do is just use it...butt yeah...i don't know what's going on. my hpa tank works perfect on my 98c...call tippmann
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Old May 29th, 2006, 12:05 PM   #7 (permalink)
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I found that you can not have an Expansion Chamber of any kind on the gun when using HPA.
The expansion chamber is only for CO2 it will restrict the air flow.
If you are using a remote coil or line, on the end cap that goes on the bottle tighten all the way down till it stops and back off a turn and becareful do not push the pin for the HPA in to the bottum of the bottle take it easy.
I heard that tippmanns can hand 850 psi any higher and you could do some damege to the gun. Check all O-rings you might have damge some of them if the psi was to high. I hope this helps. Chewy out
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Old May 29th, 2006, 12:08 PM   #8 (permalink)
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I found that you can not have an Expansion Chamber of any kind on the gun when using HPA.
The expansion chamber is only for CO2 it will restrict the air flow.
If you are using a remote coil or line, on the end cap that goes on the bottle tighten all the way down till it stops and back off a turn and becareful do not push the pin for the HPA in to the bottum of the bottle take it easy.
I heard that tippmanns can hand 850 psi any higher and you could do some damege to the gun. Check all O-rings you might have damge some of them if the psi was to high. I hope this helps. Chewy out
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Old May 29th, 2006, 01:48 PM   #9 (permalink)
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Have you tried using soft valve springs?
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