Fx Impact Fix & Mods for more FPS / FPE
- Thread starter AirSupply
- Start date
Does he respond to your emails? He said he would ship mine by the end of last week but I haven't received a tracking number or any other communication. Maybe he's just busy.
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I achieved the same fps at 10 bars less. No significant changes with the new housing and plenum of mk2.
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@panisd yup is about that much 10% more power (not really much) specially if you have the 1st gen Mk2, latest mk2 has a bigger integrated valve, so is a BIG difference.
@mtnGhost Duro90 bumpers fails 100% of the time shooting .022 + cal IME (specially powered ones) is the first thing I took out from my MK 1 1/2 (not sure now if MKII was the right name for early release). Even Nylon is better. And since is harder, do not cushion that much, ergo more power, like 5 to 10 more fps.
@mtnGhost Duro90 bumpers fails 100% of the time shooting .022 + cal IME (specially powered ones) is the first thing I took out from my MK 1 1/2 (not sure now if MKII was the right name for early release). Even Nylon is better. And since is harder, do not cushion that much, ergo more power, like 5 to 10 more fps.
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How do we know if its first gn mk2 or second
first time i hear that there is version 1 mk2 and verson 2 !!
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The only difference is the valve housing has a larger and integrated valve seat. In other words the valve seat is cut directly into the valve housing rather than being a separate part. FX could tell you a starting serial number but they're not good at responding to customer's questions.
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Wonder also about the hammer, probably (if not is a flaw IMO) the hammer should be heavier, 6.35mm valve needs a heavier hammer to fully open, even on pressures under 150b.
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Ok but I believe you can get this speed under 140 bar. Here is a picture and drawing of the modified port if you need it. It's best to cut with a 1/8" carbide burr in your rotary tool then switch to something less aggressive to finish and polish. You don't have to take the top off the probe but it helps. A 7mm port feeds the brass one so you want the brass opening a little larger. You should not be able to see the pellet probe edges through the brass port. These dimensions work well for me.
Dear Heavy Impact,
When I go to amend the brass TP of my friend Wajih's Impact, I find that some measurements are missing in the picture referred above.
Outer hole size is 7.4mm. Inner oval shape has length of 6.3 mm and width of 5 mm.
But what is the measurement from where the oval shape has to be started with reference to round outer hole?
This measurement appears to be missing due to which I am reluctant to amend it.
Further will you please let me know that if you have done it on CNC or what other machine ?
Regards,
Umair Bhaur
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Start at the outside making it 7.4mm then make the elongated portion and then smooth the transition between them.
I do this with a li-ion rotary tool and a carbide burr, second one from the right in pic ⑲.
Polish the area last using a felt tip and red polishing compound.
Use low to medium speed when removing metal for best control. Polish at high speed.
![1566849435_8488950595d64399be382f5.74712453_71StjfCkhtL._SL1500_[1].jpg](https://www.airgunnation.com/attachments/1566849435_8488950595d64399be382f5-74712453_71stjfckhtl-_sl1500_-1-jpg.40855/ "1566849435_8488950595d64399be382f5.74712453_71StjfCkhtL._SL1500_[1].jpg")
![1566849471_231067135d6439bf5cb1d1.45688243_61BMycIzRjL._SL1000_[1].jpg](https://www.airgunnation.com/attachments/1566849471_231067135d6439bf5cb1d1-45688243_61bmycizrjl-_sl1000_-1-jpg.40863/ "1566849471_231067135d6439bf5cb1d1.45688243_61BMycIzRjL._SL1000_[1].jpg")
I do this with a li-ion rotary tool and a carbide burr, second one from the right in pic ⑲.
Polish the area last using a felt tip and red polishing compound.
Use low to medium speed when removing metal for best control. Polish at high speed.
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The elongated portion is only elongated towards the muzzle end. The breech side is not touched.
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Regarding Michal, the polish guy who is making the newest external plenum. I’ve sent him an email too a couple of days ago but no response yet so I haven’t had the chance to place an order. He might be quite busy I presume. I’ve checked on his webpage, it looks like he’s quite an expert modifying and tuning airguns. Let’s just hope he gets back to us soon.
I’m waiting for a valve kit that Edosan sent me a couple of weeks ago. I will start with the upgrades on my Impact X Gen 2 as soon as this kit arrives. Delrin C3, hammer weight and 6.5mm VS. Then I will do porting on both pellet (slugs) probe and brass TP.
Regarding the brass TP I’ve seen that ER does it in a different way. He rather prefers just to elongate the TP starting at the breach end, just were the o-ring groove begins and then he goes up to 7mm towards the muzzle end. Then he elongates the pellet probe too but going backwards and not cutting it in a half moon shape. There are quite a few videos and pics on his Instagram account. I’m not quite sure on which way to go. Any thoughts?
Thanks in advance
I’m waiting for a valve kit that Edosan sent me a couple of weeks ago. I will start with the upgrades on my Impact X Gen 2 as soon as this kit arrives. Delrin C3, hammer weight and 6.5mm VS. Then I will do porting on both pellet (slugs) probe and brass TP.
Regarding the brass TP I’ve seen that ER does it in a different way. He rather prefers just to elongate the TP starting at the breach end, just were the o-ring groove begins and then he goes up to 7mm towards the muzzle end. Then he elongates the pellet probe too but going backwards and not cutting it in a half moon shape. There are quite a few videos and pics on his Instagram account. I’m not quite sure on which way to go. Any thoughts?
Thanks in advance
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The best possibility is a full bore sized transition from the transfer port into the bore. Removing the top of the probe gets you closer.
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Thanks for the quick response.
I would like to say thank you to Edosan for starting this incredible thread. I just can’t remember of any thread that has been so helpful, informative and productive than this one. Of course I would like to say thank you to all the participants that have contributed with their experiences and thoughts. Its really impressive how much I’ve learnt in the last couple of months. Keep up with the good work folks!!!
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Today I have tested again mk1 VH and Plenum VS mk2 VH and Plenum. Since I measure it in mps here some results ...
Mk1 setup 145bar JSB heavy mk2 33.95gr ... 285ms
Mk2 setup 145bar JSB heavy mk2 33.95 gr ... 318ms
Also tomorow will test new ext plenum 45cc in 0.8mm Toray carbon wrapped Al body ... looks nice
Mk1 setup 145bar JSB heavy mk2 33.95gr ... 285ms
Mk2 setup 145bar JSB heavy mk2 33.95 gr ... 318ms
Also tomorow will test new ext plenum 45cc in 0.8mm Toray carbon wrapped Al body ... looks nice
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Today I have tested again mk1 VH and Plenum VS mk2 VH and Plenum. Since I measure it in mps here some results ...
Mk1 setup 145bar JSB heavy mk2 33.95gr ... 285ms
Mk2 setup 145bar JSB heavy mk2 33.95 gr ... 318ms
Also tomorow will test new ext plenum 45cc in 0.8mm Toray carbon wrapped Al body ... looks nice
Can you test the .22 calibre as well. That would be really helpful
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I just started this thread, is a WE thread
as I say several pages back, collective knowledge LIVE. is all there for the one who seeks! Anyway you are welcome, not many take the time to say thanks! happy to help. I thanks to many friends around here, and specially to Ernest Rowe, without his initial help when I started with mods, his videos and all, I would never be able to build Silver Surfer: https://www.airgunnation.com/topic/meet-silver-surfer
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Today I have tested again mk1 VH and Plenum VS mk2 VH and Plenum. Since I measure it in mps here some results ...
Mk1 setup 145bar JSB heavy mk2 33.95gr ... 285ms
Mk2 setup 145bar JSB heavy mk2 33.95 gr ... 318ms
Also tomorow will test new ext plenum 45cc in 0.8mm Toray carbon wrapped Al body ... looks nice
Can you test the .22 calibre as well. That would be really helpful
@
Test was done on 160bar
Jsb redesigns ... 980fps
Mp mold slug 35grain ... 880fps
I believe I can get redesigns in over 1000fps to tighten more hamer.
So far, I believe for 500mm barrel its what can give.
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