Fx Impact Fix & Mods for more FPS / FPE

Forums PCP Airguns Fx Impact Fix & Mods for more FPS / FPE

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    edosan
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    Just in case someone wonder 😂

    Dirty hands … Sorry, I was in the  garden 😅

    Mm

    Inches

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    Scotaty
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    Very nice results edosan. 

    I'm getting this after power kit.

    Jsb 18.13 @ 70m

    Now I'm getting even better results shooting @970fps.

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    edosan
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    Thanks!

    That is a hammer weight, I will get several next week, different weight to test. With the 18ns jsb no need, the point of the weight is to fully open the valve on high reg pressure (over 150 bar). You should be able to get 1000fps or so with the stock impact and just tunning. But that pellet will be less accurate at that speed (I have tried)

    The power kit will probably include that weight. Nice group!

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    Scotaty
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    The gun is more consistent and efficient now. I will share groups @100m when the weather calm down a bit. 

    For now I'm trying jsb 30 44g @ different speeds, I got them up to 925fps @ around 160-165 bar with 600mm smooth Twist. 

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    edosan
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    Sorry I do not see good in my smartphone, I can see now is a valve seat, a delrin (bumper replacement?) And the hammer weight…with the 0.30 cal makes a lot of sense now, nice!

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    heavy-impact
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    Scotaty

    I'm getting this after power kit.

    Jsb 18.13 @ 70m

    Now I'm getting even better results shooting @970fps.

    What's your barrel length and regulator pressure on the .22?

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    Scotaty
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    edosan

    Sorry I do not see good in my smartphone, I can see now is a valve seat, a delrin (bumper replacement?) And the hammer weight…with the 0.30 cal makes a lot of sense now, nice!

    Yes it's a bumper. 

    heavy-impact

    Scotaty

    I'm getting this after power kit.

    Jsb 18.13 @ 70m

    Now I'm getting even better results shooting @970fps.

    What's your barrel length and regulator pressure on the .22?

    600mm smooth twist X @145b

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    heavy-impact
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    Scotaty

     

    heavy-impact

    Scotaty

    I'm getting this after power kit.

    Jsb 18.13 @ 70m

    Now I'm getting even better results shooting @970fps.

    What's your barrel length and regulator pressure on the .22?

    600mm smooth twist X @145b

    I get 1010 fps shooting 18.5 H&N at 120 bar from the same barrel after elongating the barrel transfer port, opening up the pellet probe and polishing the barrel with 1200 grit compound. I think it did 970 at 100 bar with the 18gn JSB. Just something to consider if you want to improve efficiency. The JSB pellet is more accurate but I'm looking for expansion so I shoot the H&N hunter extreme until the JSB Hades arrives.

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    edosan
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    I have been thinking about 0.22 pellet probe, and here is a theory:

    No matter how much we elongate, the main restrictor is the pellet probe end hole (no the TP hole) the one that finally send the air to the pellet, I mean the sequence is (pls correct me if I am wrong): TP Valve, TPBarrel (brass), TP Pellet Probe and finally end hole of the pellet probe. If you check that hole is tiny, smaller than the elongated transfer port, so here is an idea to share (and hopefully get some feedback) I will probably try it later:

    Thoughts?

    If it works might work for all calls, one less restriction.

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    Azycray
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    edosan

    I have been thinking about 0.22 pellet probe, and here is a theory:

    No matter how much we elongate, the main restrictor is the pellet probe end hole (no the TP hole) the one that finally send the air to the pellet, I mean the sequence is (pls correct me if I am wrong): TP Valve, TPBarrel (brass), TP Pellet Probe and finally end hole of the pellet probe. If you check that hole is tiny, much more than the elongated transfer port, so here is an idea to share (and hopefully get some feedback) I will probably try it later:

    Thoughts?

    Excellent idea! There should still be enough of the probe left to push the projectile without any jamming issues. At least with slugs, you could have some issues with a tight fitting pellet, possibly. But I like the idea and think it is worthy of trying.

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    heavy-impact
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    edosan

    I have been thinking about 0.22 pellet probe, and here is a theory:

    No matter how much we elongate, the main restrictor is the pellet probe end hole (no the TP hole) the one that finally send the air to the pellet, I mean the sequence is (pls correct me if I am wrong): TP Valve, TPBarrel (brass), TP Pellet Probe and finally end hole of the pellet probe. If you check that hole is tiny, smaller than the elongated transfer port, so here is an idea to share (and hopefully get some feedback) I will probably try it later:

    Thoughts?

    If it works might work for all calls, one less restriction.

    That's similar to what I did on my .30 probe but mine is more like a horseshoe. I removed the floor and thinned the walls. I thinned the walls on my .22 as well.

    The shape below is all you really need but keep in mind there needs to be a slight bevel on the leading edge to be sure it doesn't cut the breach o-ring. You need tall enough sidewalls to push the pellet in a straight line.

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    edosan
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    Interesting, thanks heavy!

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    Scotaty
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    Very excellent guys. Please heavy-impact share some pictures of the mods you did to the pellet probe's. 

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    edosan
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    heavy-impact
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    Scotaty

    Very excellent guys. Please heavy-impact share some pictures of the mods you did to the pellet probe's. 

    Here's the .22 along with a description. https://www.airgunnation.com/topic/fx-impact-x-25-cal-heavy-over-880fps-anyone/page/2/#post-450969

    I'll have to get you a pic of the .30 parts tomorrow because I just finished TIG welding a header for my daughter inlaw's jeep and I've messed up my eyes. I turned my shield down to 8 because I can't see what I'm doing and now my vision is all spotty and I have a headache.

    I'm going to the public shooting range tomorrow so I'll have some accuracy results to share for the .22 Impact.

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    Scotaty
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    edosan

    heavy-impact

    Scotaty

    Very excellent guys. Please heavy-impact share some pictures of the mods you did to the pellet probe's. 

    Here's the .22 along with a description. https://www.airgunnation.com/topic/fx-impact-x-25-cal-heavy-over-880fps-anyone/page/2/#post-450969

    I'll have to get you a pic of the .30 parts tomorrow because I just finished TIG welding a header for my daughter inlaw's jeep and I've messed up my eyes. I turned my shield down to 8 because I can't see what I'm doing and now my vision is all spotty and I have a headache.

    I'm going to the public shooting range tomorrow so I'll have some accuracy results to share for the .22 Impact.

    Thank you guys. 

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    ackuric
    Participant
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    edosan

    I have been thinking about 0.22 pellet probe, and here is a theory:

    No matter how much we elongate, the main restrictor is the pellet probe end hole (no the TP hole) the one that finally send the air to the pellet, I mean the sequence is (pls correct me if I am wrong): TP Valve, TPBarrel (brass), TP Pellet Probe and finally end hole of the pellet probe. If you check that hole is tiny, smaller than the elongated transfer port, so here is an idea to share (and hopefully get some feedback) I will probably try it later:

    Thoughts?

    If it works might work for all calls, one less restriction.

    Thats essentially how a gen 1 marauder bolt probe works (I currently use a modified one). It will certainly help if the probe is currently a restriction. Heavy-Impacts approach works great as well and may even minimize pellet damage upon loading. 

     

    -Matt

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    edosan
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    thanks @ackuric just bought 2 extra probes so I will have plenty to test  ;)

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    heavy-impact
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    I said I was going to the public range today and I did… but I didn't shoot at all. I got there 1 hour after opening and the place was at 70% capacity and all powder burners blasting through the concrete pipes. I can't take the concussive blast, it makes me jump and gives me a headache. I shot some in my backyard at 70yds but nothing to brag about. My Huma regulator bottoms out at 100 bar so with the power wheel on min it produces 975 fps with 18gn JSB and I get about 5/8" groups. The 18.5gn H&N shoots OK but throws more fliers. My JSB pellets had a lot of flat spots on the skirts. The guy at the shot show said JSB has 27 ladies inspecting each pellet and packaging them by hand… Well I think some of those ladies are slacking.

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    heavy-impact
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    Scotaty

    edosan

    Sorry I do not see good in my smartphone, I can see now is a valve seat, a delrin (bumper replacement?) And the hammer weight…with the 0.30 cal makes a lot of sense now, nice!

    Yes it's a bumper. 

    heavy-impact

    Scotaty

    I'm getting this after power kit.

    Jsb 18.13 @ 70m

    Now I'm getting even better results shooting @970fps.

    What's your barrel length and regulator pressure on the .22?

    600mm smooth twist X @145b

    I think your regulator gauge is reading much higher than the actual pressure. My original FX gauge was reading more than 20 bar higher than actual pressure. I changed them for Wika gauges.

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