A-5 - Low Velocity when using HPA
Printed From: Tippmann Paintball
Category: Paintball Equipment
Forum Name: Gun Maintenace and Repair
Forum Description: Important info for keeping your marker in top shape
URL: http://www.tippmannsports.com/forum/wwf77a/forum_posts.asp?TID=155141
Printed Date: 25 January 2026 at 8:24pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: A-5 - Low Velocity when using HPA
Posted By: ykwak
Subject: A-5 - Low Velocity when using HPA
Date Posted: 21 May 2006 at 11:34pm
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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Replies:
Posted By: Bango
Date Posted: 21 May 2006 at 11:41pm
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Hmm, are you using a regulator? You might need to adjust the pressure on it.
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Posted By: cus98tom
Date Posted: 22 May 2006 at 11:20am
| I think at this point you should give Tippmann a call and explain to them as you did here and then be specific on what you want them to do, for example the marker should be able to be adjusted to 325fps.For my two cents I think the valve spring needs to be replaced. |
Posted By: ykwak
Date Posted: 22 May 2006 at 11:24am
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Thanks for the replies. Bango, if you see my first post, you will see that i have tried outputs between 700 and 900 psi. Cus98tom, this is happening on 3 different guns. All purchased within 1 year. I have heard this problem happening to many people. Also, a weak valve spring would normally mean a Leak due to a bad seal with the cup seal, OR a LOT of air getting through, and thus high velocities. thanks for the info, but these will not solve the problem. Anyone else have any ideas i could try? |
Posted By: cus98tom
Date Posted: 22 May 2006 at 6:03pm
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you have tried all other options , The only one left is the valve, and or spring , and I actually think its to strong (for AIR), A weaker spring will stay open longer, milliseconds but still longer, as we warm up (85-90deg in FL) Co2 has more energy than HPA that is gas coming out of the tank. |
Posted By: ykwak
Date Posted: 22 May 2006 at 10:45pm
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so i am guessing not many of you are having these problems? oh, and thanks for the tip cus98tom! i just got off the phone with tippmann a couple hours ago and they are going to send me a new valve and powertube to try on one of the guns to see if it helps. I dont know where to find a weaker valve spring since i only see sear, hammer, and trigger springs as aftermarket. if Anyone has had this problem before...please tell me your solution. thanks!  |
Posted By: cus98tom
Date Posted: 24 May 2006 at 6:17pm
| I was think just a replacement from Tippmann , Springs are made by the "boat load" and maybe you have one out of tolerance. |
Posted By: Snake6
Date Posted: 24 May 2006 at 8:48pm
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Tippmann won't send you replacement valve springs, I already tried.
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Posted By: old fart
Date Posted: 24 May 2006 at 9:18pm
| it sounds like you have a valve spring from a low psi kit, If you bought the marker used the previos owner may have had a lp kit on the gun then converted back and forgot to change the valve |
Posted By: darkmaster
Date Posted: 29 May 2006 at 2:08pm
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I had the same problem and i shipped my a-5 back to tippmann twice from canada and they still didnt fix it so i just asked for a new marker and they replaced it. ------------- Dopa mi la tempesta (After me, The storm) |
Posted By: NeXuS
Date Posted: 12 June 2006 at 10:33am
| I have the same problem in my A-5 and I have done the exact same fixes that you had done. Nothing I have found will get this gun over 250. |
Posted By: Snake6
Date Posted: 12 June 2006 at 12:09pm
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Call Tippmann and ask for a new valve. Your valve spring is most likley out of tolerance. -------------
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Posted By: Hybrid
Date Posted: 12 June 2006 at 7:59pm
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i really wanna get it back together to play this coming weekend, any thoughts? |
Posted By: Lonnie 942
Date Posted: 12 June 2006 at 8:44pm
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i had the exact same problem about 2 weeks ago i called tippmann and they suggested that i call the maker of my hpa tank which was pure energy and have them send me a shim to bump up the output pressure to about 900 i put in the shim and my A-5 shoots about 290-295 i also got a spring kit from trinity and put in the red one ------------- A-5 richoet hopper apex barrell combat stock e-grip tactical sling |