Tuning Can you link multiple FX Power Plenum's?

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Yes you can. Here are some numbers I got before and after +2 stacked PP's on a .25 cal DreamPup. Leaving the reg set where it was, the +2 PP's gave me a 35fps increase at the muzzle. I then ended up turning the reg down from OEM 140 to 110. With the transfer port adjusted down to the 177/22 setting it gave me the 880 fps I wanted on HS=4, with a very smooth shot cycle and great accuracy. And now my shots per fill went way up since I could shoot down to 110 bar before falling off the reg.

2 PP.1616436797.jpg

 
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So this was my idea. I have a Wildcat MK3 .25 500mm barrel, I was going to link Earnest Rows 2.5" PP and a Dreamline 1.2" PP and add a dual transfer port. I am not so concerned about increased speed. I would like to tune the .25 Hades pellets to 900 FPS with the regulator pressure as low as possible (maybe 100bar or 110bar) in order to increase my shot count. Does this theory make sense? I should have all the parts this week so I can start the test. Any input or more experience would be greatly appreciated. TMH thank you for post that information it helps confirm that this just may work. We will see.
 
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LSS152- if for some reason things don’t work out, you can go with the shorter plenum at the rear post reg, and put the longer 2.5” one pre reg in between the air tube and the front end cap that houses the fill port. This’ll increase your shot count, and may give you additional power. Seems odd, that increasing the air tube pre reg would increase velocity, doesn’t it? It’s easy to buy into the idea of additional shot count, but more speed? Well, I own two wildcat MK2’s, a 25 and a 30 cal, and on both of those with the 2.5 extension added up front, the velocities went up. My 25 cal, using the 28 grain Barracuda Hunter extremes went from 988 to 1007 FPS, and my 30 cal shooting the 44.75’s went up from 942 to 955 FPS. Weird, but I’ll take the extra speed.

This is with no other adjustments to the gun. If you seek high power out of your wildcat, I would set the reg at around 145-150. This’ll put you at around the 935-945 FPS range with the JSB 33.95 heavys, depending on hammer spring adjustment.

Same pellet, At around 880 to 900 set it to around 135- 140 BAR, and get a greater shot count. Again, this is also depending on hammer spring adjustment.

A Huma version 2 double hole transfer port is easily a 22-28 FPS gain. Ernest Rowe also makes a dual hole transfer port, sold on 910, and he will actually machine off the step down/notch area so it now can be used on the MK2’s. Between the Ernest version and huma’s they look almost identical, except on Ernest’s design the TP opening starts closer to the upper o-ring than Huma’s does. I have not performed any testing to see if this small difference affects any line up with the blocks transfer port hole, which would then affect velocity.

I approached Ernest almost a year and a half ago, to let him know not forget us MK2 wildcat die hards, and come up with a high flow transfer port like he has the impacts, crowns, and Mavericks. I’m glad he considered! I’m throwing this out there cause I don’t think too many MK2 wildcat owners know that these are available.

I know yours is an MK3 and the advice given above was based on my experiences with the MK2 platform, so your results may vary. Good luck. Just make sure when stacking these plenum sleeves that your regulator access or vent hole doesn’t get covered by the air tube clamp that you have to loosen to remove your air tube.
 
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LSS152- if for some reason things don’t work out, you can go with the shorter plenum at the rear post reg, and put the longer 2.5” one pre reg in between the air tube and the front end cap that houses the fill port. This’ll increase your shot count, and may give you additional power. Seems odd, that increasing the air tube pre reg would increase velocity, doesn’t it. It’s easy to buy into the idea of additional shot count, but more speed? Well, I own two wildcat MK2’s, a 25 and a 30 cal, and on both of those the velocities went up. My 25 cal, using the 28 grain Barracuda Hunter extremes went from 988 to 1007 FPS, and my 30 cal shooting the 44.75’s went up from 942 to 955 FPS. Weird, but I’ll take the extra speed.

This is with no other adjustments to the gun. If you seek high power out of your wildcat, I would set the reg at around 145-150. This’ll put you at around the 935-945 FPS range with the JSB 33.95 heavys.

Same pellet, At around 880 to 900 set it to around 135-140 BAR, and get a greater shot count.

A Huma version 2 double hole transfer port is easily a 22-28 FPS gain. Ernest Rowe also makes a dual hole transfer port, sold on 910, and he will actually machine off the step down/notch area so it now can be used on the MK2’s. I approached him almost a year and a half ago, to not forget us MK2 wildcat die yards, and come up with a high flow transfer port like he has the impacts, crowns, and Mavericks. I’m glad he considered! 

I know yours is an MK3 and the advice given above was based on my experiences with the MK2 platform, so your results may vary. Good luck. Just make sure when stacking these plenum sleeves that your regulator access or vent hole doesn’t get covered by the air tube clamp that you have to loosen to remove your air tube.
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Bigragu, you have been a great help to me the last few days and I thank you for that. Do you think I can get to the 900 fps with the Hades and a low regulator pressure? I was crunching some numbers earlier and mathematically it seems possible to get to 100 to 110 bar and still maintain the 900fps? If I can do that it should give me about 42 or 43 shots per fill before it falls off the regulator. I had such great success with the Hades during this past season I am not really concerned about increasing the power to much I know from experience these preform well in that FPS range i.e. accuracy/energy transfer to the animal.
 
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That should be no problem. You will be able to, by the addition of a plenum at the rear post reg, be able to run at a lower reg pressure. Just make sure that your balanced out with the hammer spring adjustment as best you can to the reg.

Food for thought, your choice- do give yourself a bit of fluff should the need for more power arise. In other words, set up your gun at say power wheel setting number 4 to be at your constant 900 FPS. Great speed for everyday target shooting and skunk dispatch, lol.

Should the need arise for more power(such as a raccoon invasion) then by turning the power wheel to 7 you could be at around 925-930 FPS. I wouldn’t target any more than 930 FPS, that way you’ll still have the shot count you want when set at power wheel #4, at 900 FPS. Just don’t limit yourself as 900 FPS as the max output, especially for a gun designed to be at the advertised 70 ft lbs. in 25 cal.

Im unfamiliar with the weights of the 25 Haydes, but I know on the 25g JSB to the 33.95 heavys, it’s typically a 50 to 60 FPS difference due to weight. So if those Haydes are say at 25g traveling at 930 FPS, that equates to 48 ft lbs energy. With the 33.95’s at say 880 FPS you’ll be at 58 ft lbs. energy.
 
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That should be no problem. You will be able to, by the addition of a plenum at the rear post reg, be able to run at a lower reg pressure. Just make sure that your balanced out with the hammer spring adjustment as best you can to the reg.

Food for thought, your choice- do give yourself a bit of fluff should the need for more power arise. In other words, set up your gun at say power wheel setting number 4 to be at your constant 900 FPS. Great speed for everyday target shooting and skunk dispatch, lol.

Should the need arise for more power(such as a raccoon invasion) then by turning the power wheel to 7 you could be at around 925-930 FPS. I wouldn’t target any more than 930 FPS, that way you’ll still have the shot count you want when set at power wheel #4, at 900 FPS. Just don’t limit yourself as 900 FPS as the max output, especially for a gun designed to be at the advertised 70 ft lbs. in 25 cal.

Im unfamiliar with the weights of the 25 Haydes, but I know on the 25g JSB to the 33.95 heavys, it’s typically a 50 to 60 FPS difference due to weight. So if those Haydes are say at 25g traveling at 930 FPS, that equates to 48 ft lbs energy. With the 33.95’s at say 880 FPS you’ll be at 58 ft lbs. energy.
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Last question.... Since I will be adding extra air space to the air tube by doing what you suggest(2.5" PP at the end of the air tube) can I increase the volume of air in the tube? Say from 230 bar to 250 or 260? If you could do that safely that may give a few more shots per fill. Thanks again for your help.
 
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Just take it to the extreme. As I understand it, Russ Bear (winner of last Extreme Benchrest) just relies on a huge tank instead of a plenum or regulator. Each shot has a negligible effect on the overall air pressure in the tank. It's the ultimate power plenum. Every shot is just like the last due to the sheer volume of the tank.

While I've seen guys with the Ernest Row Plenum and the Power Plenum to get maximum size, there's a point of diminishing returns. Check with the folks with the dual power plenum setups and see if it's worth it. They should be able to tell you what the performance increase is if any over the single plenum.


 
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Just take it to the extreme. As I understand it, Russ Bear (winner of last Extreme Benchrest) just relies on a huge tank instead of a plenum or regulator. Each shot has a negligible effect on the overall air pressure in the tank. It's the ultimate power plenum. Every shot is just like the last due to the sheer volume of the tank.

While I've seen guys with the Ernest Row Plenum and the Power Plenum to get maximum size, there's a point of diminishing returns. Check with the folks with the dual power plenum setups and see if it's worth it. They should be able to tell you what the performance increase is if any over the single plenum.



thats a great point. Glad you brought that up. During my initial tests with these a year and a half ago, the shorter plenum worked great. Gained another mag’s worth of shots if I maintained the same velocity at a lower reg pressure, but I chose to keep my reg setting the same and gain more speed.

but when the 2.5 ones came out, it was just ok for my 25 cal and did not do well on my 30 cal at all. The extreme spreads on my 30 increased, and it seemed you had to wait longer for the plenum to recharge itself.

But when I moved the longer ones up front, both calibers increased in power and shot count. 

I want to make it clear, that because of the high power I have my cats tuned at, I only gained like 7 additional shots in the 25 cal and only around 5 for the 30 cal. So, the shot count increase I’m ok with, but more so excited that my velocity increased by moving the longer plenum up front, pre reg.

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Please be aware that short barrels and low reg pressure is not a good combination. With a short barrel ( like your 500 mm) you typically want a short burst of air behind the pellet or slug in order to avoid air still blowing behind the projectile when leaving the barrel. When you check Matt Dubber’s video’s he always recommend high reg settings ( min. 150 bar) in combination with short barrels when tuning a rifle to relaiv high powers like you want. With very big plenum size and low reg setting the valve will open too long time and this has negativ inpact on air consumption and general balance of your shooting. Your idea will most likely work much better on a sniper version . 
 
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Also note that starting from the second batch batch of WC3 production the Ernest Rowe Power plenum will not fit anymore at the back. The endcap construction was changed by FX hence the ER PP does not fit here anhmore. Well usable at the front end. The DL PP you want to use will most likely also not fit well anymore on second and onwards batches. I suggest to contact 910 airgun tuning ( ask Newman) for possible solutions coming up. In case you have a wildcat with the endcap with the 2 small holes you should be fine to experiment as you plan. ( you need some sort of spanner to open that cap) Again the compact with huge plenum in combi with high speed hades shooting is most likely not the optimum set up. I believe in case you can use the 2 PP you mention the smaller used as PP and the bigger one used as airtube extension will be your best way to go...
 
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