Umarex Notos Budget to Gucci build

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joe9090

joe9090

Member
May 23, 2022
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United States
Started life as a basic Notos, i wanted to see just how far i could push the platform. The goal is to tune for 22 Fx Hybrid slugs at or around 960fps. I started this project for fun, as when i started into airguns building crosman 2240 2250 etc etc QB co2 rifles all onto pcp rifles. It has been alot of fun and have smiled from beginning to end.

Things ive addeded-
500mm Fx liner system
Buckrail chassis
Huben power regulator drop block
300cc carbon bottle
Sabertactical vertical grip
Magpul prs gen 3 buttstock
C88 machining power plenums
Donnyfl Tanto
Carbon fiber Liner sleeve
Utg tactical quick release rings
Sightron S1 4-12x40 MOA 20 scope

I opened up the valve seat and block transferports all to 4mm, along with the plenum transferport. Plenum transferport port is the issue, needs to be larger then 4mm but tricky to do. Ordered a new valve poppet made from peek and stainless steel. Im looking to swap out the valve return spring for something just a bit lighter as to open the valve at higher reg pressures. So far ive been able to pull 35 foot pounds. But i need to pull at least 10 more for the end goal.

Rifle will be used as a small game hunter.

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Its 100% about air.

1.) How long the air is acting upon the base of the pellet
2.) How much pressure is pushing against the base of the pellet

Barrel length (to a point) increases speed as does more available air (plenum) and wider path (porting). Everybody loves to port out the air block but this is only 1 of the 4 restrictions, one also needs to port the valve, the transfer port and the barrel.
 
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Firewalker said:
Its 100% about air.

1.) How long the air is acting upon the base of the pellet
2.) How much pressure is pushing against the base of the pellet

Barrel length (to a point) increases speed as does more available air (plenum) and wider path (porting). Everybody loves to port out the air block but this is only 1 of the 4 restrictions, one also needs to port the valve, the transfer port and the barrel.
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I am fully aware of the basic science behind how modern pcp rifles work. These are all things i have already done. Thanks for the reply
 
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I can only push the 22gr hybrids at 850fps. 4.5mm port, 500mm barrel, a few c88 plenums. I also have brass and tungsten hammer weights with 4mm extra preload. Brass seems to work better with the regulator set to 150 bar. I ordered a huben power notos dream regulator 2 weeks ago that still hasn't shipped and a 360cc carbon bottle. When that comes in I'm going to experiment with regulator pressure and see if I can't push anymore power out of it and I'm hoping that tungsten weight will come in handy with a higher reg pressure.
 
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me_ne_frego said:
I can only push the 22gr hybrids at 850fps. 4.5mm port, 500mm barrel, a few c88 plenums. I also have brass and tungsten hammer weights with 4mm extra preload. Brass seems to work better with the regulator set to 150 bar. I ordered a huben power notos dream regulator 2 weeks ago that still hasn't shipped and a 360cc carbon bottle. When that comes in I'm going to experiment with regulator pressure and see if I can't push anymore power out of it and I'm hoping that tungsten weight will come in handy with a higher reg pressure.
Click to expand...
High pressure pneumatics now carrys the huben reg so shipping is fast. Sounds like a great build
 
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Floridaman2005 said:
I went from shooting the 15.89g hades at 725 fps to 800 fps with nothing but the CRC plenum install. I didn’t change the hammer or regulator at all (yet).
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Nice. My 22 build can get just under 50 foot pounds, I find 42 foot pounds is the sweet spot for accuracy. The 25 build i did 55 foot pounds but have not dialed in a proper tune yet but its coming. I believe I have maxed these little buggers out. I don't see there is anything more I can do to them. Maybe some color 🤔
 
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JaceSpace1369 said:
Nice! Did it affect your shot count at all?
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I haven’t done a full shot count yet, but if anything probably very little. The extra 25cc plenum probably made up for most of the extra air per shot, if I had to guess. Didn’t change reg or hammer at all. I will run a full cylinder at some point and see if it did, but I don’t even know how many it got before the plenum. I think it is supposed to get like 20ish full power shots so I’ll test it in the next few days and update my findings.
 
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joe9090 said:
Nice. My 22 build can get just under 50 foot pounds, I find 42 foot pounds is the sweet spot for accuracy. The 25 build i did 55 foot pounds but have not dialed in a proper tune yet but its coming. I believe I have maxed these little buggers out. I don't see there is anything more I can do to them. Maybe some color 🤔
Click to expand...

PXL_20250213_152211496.jpg
 
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