FX IMPACT Tuning

Forums PCP Airguns FX IMPACT Tuning

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    tomhu0918
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    Member

    Hi everyone,

     

    I used Jsb pellet .25 king heavy 33.95gr. Which the factory reg setting around 110Mbar. And the speed is 810fps.

    My wheel all set at Max. And hammer spring tension is 18mm as factory setting.

     I turn the reg countclockwise which increases the reg pressure to 130Mbar.

     

    But the speed drop to 750fps. How come the speed decrease??

     Should I adjust the hammer spring as well to get higher speed?

    Thanks.

     

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    sniperlabyo
    Participant
    Member

     The HSTA must be tighten when the reg pressure is increased to get max FPS.

     Increasing the reg pressure requires more HST to open the valve more when you had the regulator pressure at 110b, if your PW is max out you need to tighten down the PW adjustment screw C9, do not bottom out C9.

    when you set the desired speed the Valve adjuster now can be adjusted to fine tune the FPS, ES and  air efficiency.

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    Funshine
    Participant
    Member

    tomhu0918, try these settings: Adjust the hammer spring from 18mm to about 16mm( set the wheel to Max).  Increase your Reg pressure to 138-140, and last adjust the Valve adjuster to a bit less than the 4th line… let it sit directly on the line or a little less. Do all adjustments on a full 250 fill. Now dial the power wheel to 5 or 4 and take your chrony readings.

    My Impact X 25 700mm shoots the JSB's 33.95gr at average of 860 on power 4 with similar settings. You can now fine tune from there.  Good Luck

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    tomhu0918
    Participant
    Member

    Mr, Sniperlabyo and Funshine,

     

     You gave me an answer which exact I want!!!!!!!!!!!!!!!

    I really appreciate your suggestion and will try it.

    Wish you have a wonderful day!

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    DeadEyeDill
    Participant
    Member

    Funshine

    tomhu0918, try these settings: Adjust the hammer spring from 18mm to about 16mm( set the wheel to Max).  Increase your Reg pressure to 138-140, and last adjust the Valve adjuster to a bit less than the 4th line… let it sit directly on the line or a little less. Do all adjustments on a full 250 fill. Now dial the power wheel to 5 or 4 and take your chrony readings.

    My Impact X 25 700mm shoots the JSB's 33.95gr at average of 860 on power 4 with similar settings. You can now fine tune from there.  Good Luck

    Why such a high reg pressure? Those settings sound like alot of air is wasted.

    I had  700mm barrel on mine.

    My settings, 

    Reg , 105

    HST, 3

    Valve, i believe it was between 2 and  3

    Now with those settings i was getting over 100 shots at 860 fps. And accuracy was insane 

     

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    tomhu0918
    Participant
    Member

    What's the length of your hammer spring? less than 18mm? What's your pellet's weight?

     

    I am curios about your setting. 

    My X .25 700 Factory setting:

     

    Reg , 105~110

    HST, MAX(18mm)

    Valve, full open

    I only got  830 fps for .25 king heavy 33.95gr.

     

     

     

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    DeadEyeDill
    Participant
    Member

    tomhu0918

    What's the length of your hammer spring? less than 18mm? What's your pellet's weight?

     

    I am curios about your setting. 

    My X .25 700 Factory setting:

     

    Reg , 105~110

    HST, MAX(18mm)

    Valve, full open

    I only got  830 fps for .25 king heavy 33.95gr.

     

     

     

    I never did measure the HST. I do remember my buddy adjusting to where it had no play back and forth on max. Thats the only difference between my tune and tours i believe. 

    Try to adjust the hst to wjere it has not play. By this i mean tighten is to where it just barely moves i mean barely.  But yeah thats the only difference i can think of

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    DeadEyeDill
    Participant
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    Oh and when i say the valve was fully open i mean i had set it set where it did nothing at all. 

    I adjusted all the way out untill it had no effect on the velocity. Past the 4th line. 

    After some testing and what not me and a buddy found this to be more consistent velocity wise. Amd he also took out the rubber ball thing in the valve adjuster and said that helped. I never went that far.

    When i first got my impact shooting good I had the valve set on 3 or so maybe. ( i did make a thred about how i tuned it) but after that we realized it just more consistent not using it at all

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    Funshine
    Participant
    Member

    DeadEyeDill:

    Factory setting of my gun was: Reg 145, Valve was past the 4th line mark (4plus), the Hammer spring tension measurement was 14.60mm, and at power Max, the gun was shooting at 895-910 fps. The gun was definitely not in harmony as Ted explained. Remember that this is a .25, not a .177. After playing with it, I was able to get it shooting quite well at the settings I mentioned above. I get the power at Power setting 4. At max,  the velocity is significantly higher. I am also shooting the 33.95gr not the 25gr. I do not think that you can achieve my velocity etc at your regulator setting of 105-110. If you can confirm that you are shooting .25cal 700mm impact X using  33.95 gr pellets with regulator setting at 110 bar, and power level 4, even 5, then I'll try those settings, too.

    regards.

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    JU
    Spectator
    Spectator

    Funshine

    Hammer spring tension measurement was 14.60mm

    Where are you measuring hammer spring tension?

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    DeadEyeDill
    Participant
    Member

    Funshine

    DeadEyeDill:

    Factory setting of my gun was: Reg 145, Valve was past the 4th line mark (4plus), the Hammer spring tension measurement was 14.60mm, and at power Max, the gun was shooting at 895-910 fps. The gun was definitely not in harmony as Ted explained. Remember that this is a .25, not a .177. After playing with it, I was able to get it shooting quite well at the settings I mentioned above. I get the power at Power setting 4. At max,  the velocity is significantly higher. I am also shooting the 33.95gr not the 25gr. I do not think that you can achieve my velocity etc at your regulator setting of 105-110. If you can confirm that you are shooting .25cal 700mm impact X using  33.95 gr pellets with regulator setting at 110 bar, and power level 4, even 5, then I'll try those settings, too.

    regards.

    Yes i was shooting a .25.

    Yes i was shooting the 34s

    Nope not the x barrel. Just a 700mm st barrel.

    When mine was set at my said setting it was im harmony on my rifle. Yours most likely is a little different. 

    Yhe gun was supper quite amd very good on air use.  100+ shots uaing the 34s at 860 fps. Im not lying to you about any of it. 

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    DeadEyeDill
    Participant
    Member

    Funshine

    DeadEyeDill:

    Factory setting of my gun was: Reg 145, Valve was past the 4th line mark (4plus), the Hammer spring tension measurement was 14.60mm, and at power Max, the gun was shooting at 895-910 fps. The gun was definitely not in harmony as Ted explained. Remember that this is a .25, not a .177. After playing with it, I was able to get it shooting quite well at the settings I mentioned above. I get the power at Power setting 4. At max,  the velocity is significantly higher. I am also shooting the 33.95gr not the 25gr. I do not think that you can achieve my velocity etc at your regulator setting of 105-110. If you can confirm that you are shooting .25cal 700mm impact X using  33.95 gr pellets with regulator setting at 110 bar, and power level 4, even 5, then I'll try those settings, too.

    regards.

    Yes i was shooting a .25.

    Yes i was shooting the 34s

    Nope not the x barrel. Just a 700mm st barrel.

    When mine was set at my said setting it was im harmony on my rifle. Yours most likely is a little different. 

    Yhe gun was supper quite amd very good on air use.  100+ shots uaing the 34s at 860 fps. Im not lying to you about any of it. 

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    DeadEyeDill
    Participant
    Member

    Also when your adjusting the reg do you only shoot on max to get the fps?

    When i adjusted mine i would set the reg then check all settings on the hst for velocity. 

    If the difference between max and say 4 isnt much at all then lower the reg until you actually get it where each setting changes like it should.

    Mine at certain reg pressure like 130, 120 it would shoot 900 fps on max, 5, and 4 would be high 890s

    On 105 bar reg pressure ( i check my reg with a wika gauge so it was right 105) it was still high almost 900 fps but each click lowered it. On 3 is just where everything fell into place for me.

    The accuracy was very good. Like unreal good. 

    Gun sounded really good and was really quite at rjose settings. No waste of air at all. Pellets stable flying past 100 yards.

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    Funshine
    Participant
    Member

     

    The caliper should be inverted to use the inside jaws not as illustrated by their photo. Second photo shows this.

    JU: This is how you can tell the hammer spring adjustment settings (Airgun Depot's site) They also list the default adjustments for each caliber and settings.

    https://www.airgundepot.com/fx-impact.html    check this link out, scroll to the bottom. 

    DeadEyeDill: I don't doubt you, I just wanted to be certain before trying your adjustments as it seems that yours appears much better than mine. Only thing is I assume that the higher the HST tension, the higher the wear on the gun. I may give it a shot when I get a chance.

    regards.

     

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    PerkyVal
    Participant
    Member

    It seems to me that the settings wouldn't, and shouldn't be the same for a 700mm barrel as it is for a 600mm barrel.

     

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    DeadEyeDill
    Participant
    Member

    PerkyVal

    It seems to me that the settings wouldn't, and shouldn't be the same for a 700mm barrel as it is for a 600mm barrel.

     

    Who spoke about a 600mm? 

    Im telling everything i did for my 700mm.

    FUNSHINE- i see what your saying about yhe higher hst to be bad. But it also wasnt on max so its not hitting the valve harder then say a normal setting on max. Thats just my thoughts on that.

    Anyhow good luck with tuning! It can sure take some time but when everything falls in place youll be very impressed by the gun.

    I just couldn't get used to feel of the gun. Other than that it was the best gun i owned

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    JU
    Spectator
    Spectator

    Funshine

     

    JU: This is how you can tell the hammer spring adjustment settings (Airgun Depot's site) They also list the default adjustments for each caliber and settings.

     

    Thank you, I thought that had to be it.

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    tomhu0918
    Participant
    Member

    Hi DeadEyeDill,

     

     Is your 700mm barrel  normal "ST" ? 

    Mine and FUNSHINE are 700mm "STX" barrel.

    Maybe that the reason causes different result.

     

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    DeadEyeDill
    Participant
    Member

    Yes just normal st.

    Is your rifled all the way through? I only ask cause alot of poeple have just a ST liner.

    If you have just the ST liner in the x barrel system then i dint think anything would change. But now if its kne thats rifled all the way through i could see that changing it a little but it would still get you in the ball park.

    The only reason i think it would change is the rifling. Maybe it slows the the pellet down more? Im not sure.  

    Now as far as harmony goes, i bet there is a good difference betwwen the 2 barrels at said setting 

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    Funshine
    Participant
    Member

    Well, I just spent some hours on DeadEyeDill recommendations that he said he achieved with his gun and setup.  I have to tell you that there was no way that "The Impact X .25 700mm (STX as it is one of the brand new ones) will give the results DeadEyeDill mentioned.  I went through all the settings from: using JSB 33.95gr

    Reg Pressure: 105 to 140 bars. 

    Hammer Spring Tension (HST) measurements from tightening the spring until there was no movement. and going backwards to loosen it and so forth. (repeatedly for different Regulator Pressure Settings) and also Valve opening adjustments. I had huge differences as I did these adjustments. 

    I worked my way back to achieve my Harmony with these settings: HST ( 17mm – 1720mm), Regulator Pressure: 125-140 bars, Valve: between the 4th and 3rd mark. ( less than 4, and more than 3).  Power: at MAX I would average 890 and at "4" I averaged 860. With these settings my Impact X was quite silent with the sound as Ted explained on his video. 

    I know I wasted a lot of time and pellets, but I reassured myself that my settings were quite fine.

    No offence to anyone, thanks.

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