Uragan 2 in .177 help request

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cavedweller

cavedweller

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Dec 5, 2018
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Mobile, Alabama, United States
I have a new Uragan 2 in .177
I want to set it up for dedicated FT use which means it’s FPE must be below 20 fpe. I plan on shooting JSB 10.3.
Problem I need help with is as follows: apparently There are restrictors that you You can either grind down the diameter or grind grooves in it to let the air pass and get the velocity you need. See pics. Anyone ever done this before?
A8740918-331E-4D26-B565-CCFBBBE50B3D.jpeg
F52853FC-47BC-47B9-80EC-DC2DF41EE995.jpeg
 
I haven’t tuned a Uragán 2. The .177 Uragán 1 isn’t difficult to tune for 20 FPE, this without messing with a restrictor or utilizing a restrictor at all. With regs set at 90 to 95 bar and tuned in, they are good.

The restrictors are installed at the factory to limit power due to regulations. Once in the States, they are removed during make-ready by the dealers. I cannot speak on what is delivered in other countries and what restrictor may be used.
 
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I don't have one of these but I am intrigued, mechanically speaking.

Is that a restrictor kit that was shipped uninstalled with your gun? It sure looks like a set of brass plugs with a simple tapped hole that you can retrieve using the supplied screw. If they work anything like the transfer port restrictor screw adjustment in a gen 1 marauder, they simply mechanically block part of the cross-sectional flow area when they are inserted. All of these appear to be identical brass plugs. Perhaps they were intended to be machined down somehow to vary the cross-sectional area of the air transfer port, depending on the maximum power regulations for the country it is intended to be shipped to. The pocket that they are sitting in appears to be threaded so it looks like they just slip in and there is a cover screw of some sort. Is that correct?

So I take it that yours came with the one that is shown installed in your photo? Try pulling it out and comparing its length to the others. I'll bet that you will find that the one installed in yours, intended for the US, is shorter than the others, allowing full flow area and thus full power.

It should be easy enough and harmless to pull it out and examine. I would guess that the full power plug is short enough so that it just fills the side port access hole with the cover screw without restricting the flow area. In other words the inside end of the restrictor fits flush with the chamber inside for full power.

Let us know what you find out. As others have already posted, you can probably lower your power for field Target with other adjustments, and keep the full power dummy restrictor plug in place.

Feinwerk
 
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Feinwerk said:
I don't have one of these but I am intrigued, mechanically speaking.

Is that a restrictor kit that was shipped uninstalled with your gun? It sure looks like a set of brass plugs with a simple tapped hole that you can retrieve using the supplied screw. If they work anything like the transfer port restrictor screw adjustment in a gen 1 marauder, they simply mechanically block part of the cross-sectional flow area when they are inserted. All of these appear to be identical brass plugs. Perhaps they were intended to be machined down somehow to vary the cross-sectional area of the air transfer port, depending on the maximum power regulations for the country it is intended to be shipped to. The pocket that they are sitting in appears to be threaded so it looks like they just slip in and there is a cover screw of some sort. Is that correct?

So I take it that yours came with the one that is shown installed in your photo? Try pulling it out and comparing its length to the others. I'll bet that you will find that the one installed in yours, intended for the US, is shorter than the others, allowing full flow area and thus full power.

It should be easy enough and harmless to pull it out and examine. I would guess that the full power plug is short enough so that it just fills the side port access hole with the cover screw without restricting the flow area. In other words the inside end of the restrictor fits flush with the chamber inside for full power.

Let us know what you find out. As others have already posted, you can probably lower your power for field Target with other adjustments, and keep the full power dummy restrictor plug in place.

Feinwerk
Click to expand...
I had to request help from Talon Tunes.... Tony sent me the items in the picture with instructions to grind/modify them to achieve desired FPE. I am not a tweaker, so i am very hesitant to start grinding or filing away on something i truly know nothing about.
 
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zx10wall said:
I haven’t tuned a Uragán 2. The .177 Uragán 1 isn’t difficult to tune for 20 FPE, this without messing with a restrictor or utilizing a restrictor at all. With regs set at 90 to 95 bar and tuned in, they are good.

The restrictors are installed at the factory to limit power due to regulations. Once in the States, they are removed during make-ready by the dealers. I cannot speak on what is delivered in other countries and what restrictor may be used.
Click to expand...
Where are you located and is this a paying project you'd like to take on? Shooting .177 JSB heavies as heavy as 16.2g
 
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cavedweller said:
Where are you located and is this a paying project you'd like to take on? Shooting .177 JSB heavies as heavy as 16.2g
Click to expand...
Yes, I can do this. I'd think the 10.3gr (most common choice) or the 13.43gr would be the pellet to shoot. I personally shoot the 13.43 Exact Monster Redesigns at 810 fps. The 16.2 would be flying at no more the 745 fps to comply with 20 FPE. I'll PM you.
 
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zx10wall said:
Yes, I can do this. I'd think the 10.3gr (most common choice) or the 13.43gr would be the pellet to shoot. I personally shoot the 13.43 Exact Monster Redesigns at 810 fps. The 16.2 would be flying at no more the 745 fps to comply with 20 FPE. I'll PM you.
Click to expand...
text is easy 251-610-8582 i stay scary busy for 12 hours a day. email good too: [email protected]
And depending on where you are in TX? i can drop off and pick up - i could use a road trip and i could plan it around your availability.
 
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