loss of velocity after first shot

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  • ahira
    Registered User
    • Jan 2002
    • 7
    #1

    loss of velocity after first shot

    hello, well heres my two problems:

    1. i have a 114ci 3000 psi tank and a 68ci 3000 psi tank. my first shot is good but then ever shot after that gradually looses velocity until the balls are just barely clearing the tip of the barrell. if i shoot, then wait 1 or 2 seconds then shoot again, my velocity is fine. this problem only seems to arise when i fire rapidly. any ideas what the problem is?

    2. out of my 68ci tank i only get about 600 rds per 2000 psi!! i dont think my mag is supoosed to use that much air is it? i do have the retro valve on it which is very new. any ideas on this on?

    thanks for any help you guys can give.
    Tags: None
    • TippmannMan
      Inactive
      • Oct 2002
      • 378
      #2
      ok

      ok well i just want to tell you i had the same problem so you arent alone. do you mean velocity or output pressure? i have a 88 ci 4500 psi flatline and it used to drop from 800 psi to 600 psi everytime i shot which prevented me from shooting rapidly. amazingly enough when i brought my setup to RobAGD all he did was crank it up to 1000 psi and that worked just fine. if its the output pressure try pumping up the original output pressure so when you fire the psi never drops low enough to be unable to recock. if its velocity i know theres a lot of posts around here about shoot down which i am pretty sure that is called. sorry you will need to refer to those if you have shoot down related problems since i havent experienced that.

      and as for the shot count a filled 4500 psi gets about 1400 shots i think. 600 sounds about right for 2000 psi. thats what i get when i only have 2000 psi on my 4500 psi.

      a level 10 bolt also affects gas efficiency and the required pressure needed to operate the gun.

        Comment

        • ahira
          Registered User
          • Jan 2002
          • 7
          #3
          well im not sure if its shoot down or not. i only have one guage on my tank and it just tells me how much is in the tank. i think my reg is a preset one. so im not sure if i should try buying a whole new air system with an adjustable reg and 4500psi tank or not.

            Comment

            • TippmannMan
              Inactive
              • Oct 2002
              • 378
              #4
              all flatlines i know of are adjustables. what color is the regulator? that could tell a lot by identifying when it was made. call AGD

                Comment

                • athomas
                  Of course it works-its AGD
                  • Jan 2002
                  • 8039
                  #5
                  If the problem is happening with both tanks, then it probably isn't the tanks that are causing the problem.

                  Check the o-rings in the on/off assembly. Make sure the proper ones are in place.

                  Let us know how you make out. Give us your complete gun setup including air system and ASA connections. We will try to help you solve your problem.
                  Except for the Automag in front, its usually the man behind the equipment that counts.

                    Comment

                    • Nobody077
                      Yes Im still alive
                      • Oct 2002
                      • 559
                      #6
                      1st--- What type of air line are you using on your gun? If you are using Micro line move up to Macro or SS lines. Micro-line will not let enough air flow to your gun for quick fireing.
                      2nd---check,clean, and oil your AIR/retro valve and o-rings.
                      3rd--- If your tanks are screw-in type check the pin in your ASA, it may be worn or broken causing the tank valve pin to not push all the way in causing airflow restriction.
                      On a tank with 4500psi you get around 15 shots per ci, on 3000psi 10 per ci , so I would guess 7-8 per ci at 2000psi so your getting good air use from 2000psi. Good luck
                      Great Traders: RogueFactor,Doobie

                        Comment

                        • ahira
                          Registered User
                          • Jan 2002
                          • 7
                          #7
                          well lets see. i have a minimag with ss hoses,retro valve, intelframe, dye ss barrell, my on/off is brand new so i dont think thats the problem. i will try replacing all the o-rings and i am taking my filter out of my ss hose. ill let you know how it works out. thanks for the input so far

                            Comment

                            • TheTramp
                              Registered User
                              • Jan 2001
                              • 4019
                              #8
                              Originally posted by ahira
                              i am taking my filter out of my ss hose.
                              From what you've discribed, I'd bet that this filter is what's causing your problems. It's probably restricting the air flow. It could be clogged but these filters are pretty much just for CO2 (it can be very dirty) so you really don't need it with N2/air. As you are using a Retro valve you wont be using CO2 anyway so removing the filter is a good idea.
                              "Relax. Don't worry. Have a Home Brew."
                              -Charlie Papazian

                              Feedback: http://www.automags.org/forums/showt...threadid=40134

                                Comment

                                • athomas
                                  Of course it works-its AGD
                                  • Jan 2002
                                  • 8039
                                  #9
                                  Originally posted by ahira
                                  my on/off is brand new so i dont think thats the problem. i will try replacing all the o-rings and i am taking my filter out of my ss hose.
                                  The on/off is brand new? Why was it replaced? Just because it is brand new doesn't mean it is put together properly. Check your diagrams for on/off assembly to see if an extra o-ring was put in or left in by accident.

                                  The filter is probably not needed using air.

                                  A few things to check:

                                  Check your ASA. Maybe the ASA isn't pressing the pin far enough or maybe too far. both can cause air charging problems.

                                  Has the trigger rod been tampered with? Check to see if there is slack between the back of the trigger and the trigger rod when the gun is gassed up and the trigger is at rest. If the trigger is tight, then the rod needs to be loosened to provide a little slack, about a credit card thickness.

                                  Check to see if the sear is fully pressed into the rail.
                                  Except for the Automag in front, its usually the man behind the equipment that counts.

                                    Comment

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