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|03-28-2013, 08:42 AM||#1 (permalink)|
Join Date: Nov 2012
SystemX Vengeance 4.0 Pump action velocity
I just have some velocity "issue" with my Pump action Vengeance 4.0
I'm unable to reach 250 FPS with it
The reg is on the highest position , I'v put an inner spring twice the size of the original one and the adjusting screw is nearly @ the end of it's course ...
So does anybody had such experience in the past and more important the way to solve it
Thank you very much
Sorry for my poor english ... I'm a french speaking belgian so ....
|03-28-2013, 09:09 AM||#2 (permalink)|
Join Date: Oct 2007
Location: Brandon, FL
|03-28-2013, 09:12 AM||#3 (permalink)|
Join Date: Aug 2012
Learn about sweet spotting your reg and just make sure your on the front side of the bell curve. Your pressure is probably so high it s actually shutting the valve to quickly
|03-28-2013, 09:18 AM||#4 (permalink)|
Join Date: Apr 2012
I've got a System X Type X that I converted to pump. I swapped regs for something I felt was more consistent and it was a bit of work to find the optimal adjustment balance. Maxing that reg out isnt your answer. I would back it out and start over.
|03-28-2013, 12:39 PM||#7 (permalink)|
Join Date: Aug 2012
also i know this sound obvious but don't just let your marker shoot by itself, what i mean is you may have to hold the pump completely forward when shooting. i know when i first started playing with pump cockers i was letting the pump handle go when shooting and the bolt was moving back due to the air and i wasn't getting a constent shot my fps would drop way down if i didn't hold some slight tension forward on the pump handle.
|04-02-2013, 11:18 AM||#8 (permalink)|
The Man With No Plan
300-350psi is what most cockers need to shoot 300psi.
reset your IVG, unscrew it until its flush with the back of the gun.
screw it in 2-3 turns.
shoot over chrono, holding pump handle forward.
**a good bore/paint match will also help**
adjust velocity with regulator, go about 1/2 turn at a time, cycle the air 5-10 shots before checking velocity
once the fps maxes out, then adjust the IVG to desired fps.
if your reg pressure is too high or too low, it will cause low velocity
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