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need some help with chronographing autococker


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#1 bubo

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Posted 30 March 2013 - 10:35 PM

I got a trilogy sport thathas a pump kit on it. Anyway last year when I was using it I had to havethe ivg almost all the way in. This year it has a cp reg on it. Willit be best to have the ivg in the same spot or will I be able to back it outsome? Thanks guys.



#2 bassfisher

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Posted 30 March 2013 - 10:55 PM

I would back it out just in case.
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#3 andrewthewookie

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Posted 30 March 2013 - 10:59 PM

Now that you've got a reg, I would suggest trying to sweet-spot it.

Basically:
  • Back out the IVG until it is 2-3 turns in from flush (close to the back, but not all the way)
  • Over a chronograph, slowly start turning up the reg while shooting 4-5 shots with every adjustment
  • Eventually, the FPS will peak, and turning the reg up will actually cause the FPS to start dropping.
  • This is the reg's ideal setting for max flow, so we want to leave it
  • Now adjust for FPS with the IVG in back


Hopefully, the combination of having a reg and sweetspotting the gun would allow you to have your IVG not so far in.



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#4 bubo

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Posted 31 March 2013 - 02:08 AM

Will the regs sweet spot change as I screw the ivg in?

#5 SilentButDeadly

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Posted 31 March 2013 - 02:10 AM

Nope. The sweetspot is an ideal pressure that the gun runs on, the IVG does not change that pressure; only the tension of the main spring.
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#6 andrewthewookie

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Posted 31 March 2013 - 02:13 AM

Basically, the reg will function the most efficiently at a certain pressure. The IVG determines how much spring tension is on the hammer, and thus how much force is imparted on the valve to open it. An IVG that is turned in will put more force on the hammer, so the valve will be opened more when struck, and the opposite will happen when the IVG is further out. By sweetspotting, you are changing the action of the valve to better suit the performance of the reg.

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#7 dosh

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Posted 31 March 2013 - 11:30 AM

Now that you've got a reg, I would suggest trying to sweet-spot it.

Basically:

  • Back out the IVG until it is 2-3 turns in from flush (close to the back, but not all the way)
  • Over a chronograph, slowly start turning up the reg while shooting 4-5 shots with every adjustment
  • Eventually, the FPS will peak, and turning the reg up will actually cause the FPS to start dropping.
  • This is the reg's ideal setting for max flow, so we want to leave it
  • Now adjust for FPS with the IVG in back


Hopefully, the combination of having a reg and sweetspotting the gun would allow you to have your IVG not so far in.


You missed one step. Instead of bringing the pressure up til it starts dropping then leaving it, you want to back it off to the point right before it started to drop. It's not actually the reg you are balancing but the poppet valve. The increase in pressure against the cup seal will eventually start to overcome the hammer's ability to fully open the valve, thus the drop.




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