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a-5 too slow on hpa
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jamielegris View Drop Down
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    Posted: 28 October 2009 at 8:34pm
a got an a5 that shoots fine on co2. can turn it up to 330plus fps. i no way to fast.  on hpa cant get it past 240. ithink i tryed everything to fix. tryed adjusting speed. installed bigger spring, even red one. put bb in
stock. polished inside. installed lighter hammer and even power tube. still lots fast on co2. switch to hpa and looses 70fps. also have to hpa tanks both the same. is this  a normal thing or should scrap the hpa and go back to co2.
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Mack View Drop Down
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What's the output pressure of the HPA tank?

Edited for question mark.


Edited by Mack - 28 October 2009 at 8:43pm
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jamielegris View Drop Down
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not sure how i find that out. pulled appart reg and has 4 shims in it two small two large. a think that means 850 but not sure

Edited by jamielegris - 28 October 2009 at 8:46pm
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Mack View Drop Down
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I made a pressure tester by putting a mini-gauge on an ASA.  I screw it on to the end of the tank and know immediately what my output pressure is.  It's quite handy. 

The reason I asked about output pressure is that since I did this I have come across a couple of tanks that were supposedly HPA but only put out 600-650 psi.  When I used one of these on my 98 I couldn't get the velocity above 245 fps.
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jamielegris View Drop Down
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thanks thats a great idea. im  gona build one. it seems like thats what it must be. ill let you no tomorrow.
i hate the way people ask for help on here but never say what fixed there problem.
thanks again
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TinMan View Drop Down
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Originally posted by jamielegris jamielegris wrote:

stock. polished inside. installed lighter hammer and even power tube. still lots fast on co2. switch to hpa and looses 70fps. also have to hpa tanks both the same. is this  a normal thing or should scrap the hpa and go back to co2.


Try a first generation A-5 or 98Custom hammer. They are heavier and substantially increase FPS.
The early hammer has no insert where the spring is.

*I have the same simple ASA tool Mack, the variance in output pressures is surprising.
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jamielegris View Drop Down
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i put a gauge on an asa from an other gun. one tank about 690 and other just over 700.  !!! is one brand of tank better then an other or what should i do. i dont mind buying another tank but want to make sure it makes enough pressure.
i reinstalled my factory hammer it added about 14 fps. thanks.

Edited by jamielegris - 29 October 2009 at 6:41pm
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jamielegris View Drop Down
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my tanks are both ninja. and you can adjust pressure with shims.  they say if you take one out pressure will be 650. should i try and add another shim or is this just stupid talk. they both have four shims now
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Enos Shenk View Drop Down
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A co2 tank outputs around 800psi, so yeah. Youre short about 100psi.
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jamielegris View Drop Down
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so should i be buying and new tank, reg and specific brand. or is ther a way to fix mine.
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jamielegris View Drop Down
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i bougnt a new tank. pure energy 48 3000psi. not adjustable reg so post to be set to 850psi. on my gauge
actualy only 830 but close i guess. gun still only shooting 260 ish. not sure were to go from here. is there
some thing wrong with my gun or what.
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Have you tried putting back the stock internals?
"When I grow up I want to marry a rich man and live in a condor next to the beach" -- My 7yr old daughter.
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Mack View Drop Down
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After reinstalling the stock internals if it is still shooting low put a BB in the end cap behind the spring guide pin. 

Actually, before you do that turn the velocity adjuster in as far as it will go, then back it off four complete turns.  (On most Tippmann valves this is the maximum it can be turned out to increase velocity.  Anything further can result in velocity fluctuations and even leakage during firing.)
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jamielegris View Drop Down
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thanks for advice switched all internals back to stock except spring. also added bb to end cap and adjusted  velocity screw aprox four turns out.  i got a friend with same gun i'm gona start switching parts from is to mine untill i find problem.
i bought my gun used and it was realy dirty when i got it, so i sandblasted the hole thing in and out. is there any chance its too loose inside and would this cause a problem. my bolt and power tube assembly comes out kinda easy. my friend has to loosen case have bolts a little to get his out.
any help would be great, thanks
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jamielegris View Drop Down
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ok i just found out what's the matter with my gun turns out mine is an older model with older valve assembly. these older valves dont have near as many channels as the new ones.
gona switch mine with his tomorrow but i think i hit the nail on the head this time.
thanks every body. and ill let you no if this fixes it or not.
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jamielegris View Drop Down
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ok switch my valve with his. gun still a peace of junk. switch everything. put all my internals in his case and his shot fine. finaly noted power tube kinda loose. put o ring between power tube and hole in case were air goes to feeder. a ha shot 301fps guess i had to much blow by.
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