Tuning FX Impact Regulator Questions?

[beercanshot]

This is my third posting about my FX Impact 25 cal. (first edition) regulator issues. It all started a few days ago when after watching all the tuning videos I decided to tune my gun down to around 900 from around 930. I followed all the rules, degassed the gun, and turned the regulator screw and ended up with the reg setting at around 100 bar. Then I slowly returned the regulator to approximately 140 bar and did all the hammer spring adjustments as per meathead marksman and Earnest and low and behold, my gun was getting more shots per fill and was actually shooting quieter. Then the problems began. While continuing the tune, my chrono readings would do nicely around 900 fps but would get around one in 7 or 8 shots that would register around 750 fps. then overnight, the gun degassed. Its never done that in the years I have owned it. Leak testing found the regulator vent hole to be passing gas. That's when I decided to call Utah and order a new Huma regulator rather than rebuild the FX original. BTW my regulator has never been touched or adjusted. I have watched all the U tube videos about FX impact regulators (the old guns) and they all show a series of 5 washers. Mine has 8 pair for a total of 16. I guess my question is, what's up with my old FX regulator, ive never seen anything on U Tube that shows an Impact regulator with 8 pair of belleville washers. Finally the overall length of my FX regulator is 33.30 mm.



thank you

 

[biohazardman]

Just before they changed the Impact regs from the 14mm piston with 8mm diameter to the newer 10mm diameter AMP units they added a longer regulator rod/piston that was 16mm long and had 16 of the Belleville washers. That was early Impact-X days.

Also the early pistons were slightly cone shaped on the end so could be damaged when they were adjusted.

I would guess that your regulator rod/piston is worn, damaged from the adjustment or the o-rings have found some debris or are just worn also.

 

[kball]

I had regulator creep issues in my impact MK I (with MK II Power Plenum upgrade) and tried to rebuild the regulator. Still had creep after rebuild so I decided to replace the regulator with a Huma. The FX regulator you described is exactly what was in my Impact. The replacement Huma from AOA is a Gen 2 16mm piston with 8mm springs described as standard high pressure 80 - 150 BAR. This did solve my reg creep problem.

I'm not a expert on this issue but when I did research before the reg upgrade I learned that creep is a piston leak by issue and any regulator leak to atmosphere is an o-ring issue. If you do the Huma upgrade take your time, replace all of the reg o-rings and You-Tube is your friend. 

Hope this helps....