FX Impact MkI Regulator

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kball

kball

Member
Sep 29, 2020
162
16
FLorida, United States
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Question to FX MkI Impact owners; Is this good performance for a regulator? I have parts ordered to rebuild this reg because it is creeping +/- 15 Bar overnight. I want to know what to expect after the rebuild, should I expect the exact same speed every shot with a +/- 1 minute interval between the shots?
 
My thought - live with the creep, don't touch. I have a gen1 in .25. Last week, it was giving a 16fps spread. Un-weighed pellets, so some of the spread may be from pellet weight differences.

Also, Earnest did a video on reg creep. Recommended polishing the end of the piston with the super fine sandpaper from 3M. I think it was this one:

https://www.youtube.com/watch?v=p-p-sGTJCiA

polishing the post might give the results you want with minimum fuss
 
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I watched this video and figured since I will have the reg out and apart why not go ahead and rebuild it. For 45 bucks worth of parts hopefully I will get a no-creep regulator and the know how that comes with it. I watched another video from AOA that says polishing the seal surface flat is not easy to get right so put in a new post and be done with it. I'm hoping that replacing with all new parts I will only have to do this once to solve my creep problem. 
 
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From what I have seen alot of regs will creep from minimal temperature changes and the pressure in the plenum areas is off a bit I know alot of guys fire or dry fire 1or more shots before going for accuracy or shot strings. On my crown its about 2 shots to get back to normal. The thing to worry about is if it keeps creeping and creeping over time but for the rebuild its worth a test to see if it helps keep us posted.


 
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Overhauling the reg is very fiddly. Those tiny o rings are a pain to replace without damaging them. The large o ring within the block is difficult to remove without a long pick. I have done a couple and ended up machining some nylon tubes to aid removing and replacing the piston with the bellvill washers. Everything is so small and fiddly. If you can live with your minor creep I would suggest leave well alone. If not then have a go and I wish you good luck and hope all goes well. If you remove the trigger be careful not to lose any of the four small pins. They may be loose fit and easily fall out and be lost.
 
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WOW! While impatiently waiting for my regulator parts from FX USA I decided I would increase my reg pressure from 90 to 100 and see if maybe this would eliminate the creep. Yep, it eliminated the creep alright and turned it into a regulator SPRINT. I bumped the reg pressure up gradually while shooting a few times in between until I got it to 110 bar. I fired 10 or so rounds and stopped to see what the reg pressure was and I could actually see it climbing. I unscrewed the bottle when the reg pressure got to 160 BAR and plan to leave it alone till the parts get here for the reg rebuild. There was about 210 bar in the bottle at the time and I wonder just how high the reg pressure would have gone had I not degassed it. Has anyone ever heard of or experienced this before?
 
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Reducing the setpoint is where you have to be so careful to avoid gouging the regulator’s valve seat.


Increasing the setpoint while under pressure is generally okay. Maybe you raised it beyond the adjustment range. If so, what happens is the Belleville spring washers go flat and the seat may not be able to close and you get a runaway condition. If that was the case, you should be able to reduce it and be back in business with no damage to the seat. 
 
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I think my first regulator rebuild was a success. I got it back together and pressurized it with 200 bar in the bottle and set the reg at 95 bar. If the pressures hold overnight I will tune it tomorrow afternoon and see how it works out. I'm thinking my creep issue was caused by o-rings. All of them looked OK but the two on the adjustment screw crumbled when I took them off. The post had a small indent but it was not bad enough to cause what I was seeing?
 
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