HPA slower than CO2 on my A5??

I had the exact same problem on my 98C.  Someone else on this forum had the same problem, too.  (Do a search).  Neither of us were able to remedy the problem other than switching back to CO2.  I even went as far as getting an RVA, two sets of Madmann spring kits and a Palmer Stab.  No combo of all or none seemed to bring my velocity above 260fps.  I cracnked on the RVA with the stiffest spring and all that happened was the spring got so tight it wouldn't recock.  It did not bring my velocity up, though.  Snake6 is somewhat right, but I did a test with my Palmer Stab.  With CO2 I could get 280fps (desired) with the output of the Palmer at 690psi and a medium spring tension.  With the exact same settings and HPA, I could barely get the marker to recock.  I upped the Palmer to the max, which was 780psi and got it to shoot consistantly, but only at 260fps.  I now have an ION that I use with HPA and use my Tippmann with CO2.  I do use both, though, so it's great having the best of both worlds.

Please let us know if you get this figured out.  Like I said, two of us have had the exact same problem and could not get it to work, although tons of others have had no problem.  BTW, my HPA tankS are both Crossfire HP output tanks.  They both gave the exact same problem with the exact same 260fps max.

Snake6,

I have a DOP RVA (see sig).  I actually made a spacer to further compress the spring.  And I did put in the RED Maddmann Spring w/ and w/o the RVA, to no avail.  I tried every possible combo before giving up in frustration.  I even broke down and brought it to the local PB shop (which I'm convinced knows very little) and even they said they didn't have a clue.  However, they only came up with one or two things to try (which were the obvious).  I have no faith in both of our local PB shops, even though one is the big chain store (**V's).  But thanks for suggesting some ideas. 

BTW, don't forget to look for us at Narnia.  We'll be in a travel trailer at the camping lot.  We are the Old Man Militia.  We may or may not have a banner, but we should be right next to DeadByDawn.

Snake6 wrote: Damn, I almost forgot about that game all together! What are the dates agian?

April 1st and 2nd.  We'll be down there by late afternoon on Mar 31st, though.

mbhifi wrote: When I put CO2 on my A5, it will shoot over 300 fps, but when I put HPA on it, I cant break 240.  Anyone have any ideas??

Your valve spring may be a bit to strong( out of tolerance) I believe you stated in a responding post that the marker is new. Run this by Tippmann and ask for a new spring.  There is allot of  physics going on to blow the ball out of the barrel and they all intermingle. Why Co2 and not air, air is constant  CO2 is expanding into a gas through the entire cycle and unless it is cold out is always going to build up enough pressure to get the marker to shoot well.

Spudcrazy, look at your vertical adapter where it screws into the valve you might have one that the tube extends into the 90 and causes a narrow spot , you may have to drill it out. I had this problem , drilling curred it.