Tominco's IMPACT !

Forums PCP Airguns Tominco's IMPACT !

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    Txboy
    Participant
    Member

    Tom do you have the regulator turned up? If so what’s the pressure at? Thanks

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    Tominco
    Participant
    Member

    Txboy – I did adjust the reg a while ago. But shortly thereafter, I tried to return the regulator to as close to factory as I could get it. It should be sitting at right around 140b which should be about what the production rifles are set at. 

    I’m trying my best to only post numbers to you guys that are going to be what you can expect WITHOUT touching the reg. I wouldn’t recommend fiddling with the reg unless you are VERY experienced with tuning air rifles. There’s a very intimate relationship between the bottle, reg, hammer spring, and valve return. I would say leave the reg alone, and play to your hearts content with the others! 
    Tom

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    Michael
    Keymaster
    Keymaster

    “Tominco”Did some more crony work tonight. 

    .30 cal 44.75 JSB’s were rockin’ at 927 max, 916 av, and 9.3 sd. That’s 85.41 ft/lbs!

    .30 cal 50.15 JSB’s were rockin’ at 887 max, 878 av, and 7.6 sd. That’s 87.63 ft/lbs! 
    Tom

    Sounds like you’ve been adjusting the regulator a bit? This is where it’s going to get tricky. If a user is a power hungry animal and sets up their rifle to max out the .25 or .30, then when they change to a smaller/less powerful caliber their shot count (on the regulator) will decrease followed by an increase of unregulated air. There are so many variables with the rifle, I can’t imagine the challenges wiring a user manual.

    I have not adjusted my regulator and I’ve been getting about 870 fps with 44.75g, and 840fps with the 50g.
     

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    Ronin001
    Participant
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    I talked with Tom about those small gauges and they are hard to get an accurate reading and top it off they are at least %5 +/- error rate not including human reading error.  That is just the fact of small 1″ air gun gauges no matter which one you use.  So what may look like 140 bars could be 133 and up to 150 bar and in Toms case possibly more in upper region 147 bars which would make since with the increased speed.  

    I would agree for most air gunners the main regulator should be untouched or you may end up pulling out your hair getting it back to norm.  

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    Tominco
    Participant
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    Yes, I tweaked it a while back. But I have it set to as close to factory as I can get it. My tuning for this exercise was only using the power wheel and level adjustment screw.
    Maybe I’m still running a bit hot. I just wanted to see if I could hit the 90ft/lbs from an earlier post. I think I might have had a little more left on the level screw. So, maybe I could have truly hit that 90ft/lbs.
    Regardless, it’s pretty impressive! :)
    Tom

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    Ronin001
    Participant
    Member

    agree… 

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    Doogy
    Blocked
    Blocked

    yeahhh …thank you tominco ….my next  airgun !!!  i think april or may….
    good work tominco

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    fe7565
    Participant
    Member

    Great job! Thank you for finding time to help out the rest of us and posting your findings.  May be you will end up writing the USA-English operating instructions for the Impact :)

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    Tominco
    Participant
    Member

    So, today I WAS playing around with the reg. on purpose. I was running some experiments doing some tweaking and tuning.
    This is not for the novice or faint of heart! Don’t touch your factory reg unless you’re ready to face the consequences!  …and don’t blame me if you do!

    50.15gr, .30 cal JSB’s, got up to 904.1 fps as a top speed! There’s that 90ft/lbs that was advertised! It’s actually 91.05ft/lbs. So, you might be thinking I had my reg turned waaay up past factory specs and/or recommendations. Nope! In fact, quite the opposite… I turned it DOWN. Everything else was maxed out, but the reg was tuned down. 

    I also ran a 6 shot string that had a 891.9 HI, 889.9 AV, 2.94 ES, and 1.00 SD. That was a nice feeling! :)
    right after that I ran a 10 shot string 888.7 HI, 885.9 AV, 5.06 ES, and 2.00 SD. Again, that was very impressive! I should have put everything away and quit right then! 
    Wife just got home… gotta run!
    Tom

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    ChronicDaze
    Participant
    Member

    What kind of shot count can we expect set at full power on that .30 cal?????

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    Tominco
    Participant
    Member

    I’ll look into it. Right now would be a bad time to give a number. My hammer spring is maxed out and my valve return is WAAY open. So, I’m wasting a LOT of air right now. I don’t want to even venture a guess. With some more tuning, I’ll be able to conserve a lot more air and give a more accurate number. 

    Keep posting questions and I’ll do what I can to answer them! 

    I’m at work for the next 2 days! More testing and tuning when I get back! 
    :)
    Happy Shooting! 
    Tom

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    Tominco
    Participant
    Member

    While I was doing some crony work, I decided to run a quick test of power. Can I shoot through a 2×6? 

    Yup!
    .
    This was with the big .50gr 30cal JSB’s shooting in the high 800’s. I picked through the splinters of wood to see if I could find the pellet. All I found was a tiny little speck of lead in one of the 4 holes. 

    I also wanted to point out this little added feature of the Impact…
    The butt stock doubles as an adjustable rear rest. I’ve seen some stocks with a little post that pops out to support the rear of the rifle for precision shooting. Inadvertently, they built this feature into the Impact!
    Closed, 

    Mid height,

    Full height,

    Here’s a quick, cheap, and easy way to attach a light…
    Use some type of low rise , quick release 30mm scope mounts on your picatinny rail and I found these flashlights that snug up nicely inside! And as a bonus, you get two scope mounts and three flashlights. 2 for rifles and 1 for the car! :)

    They sit nicely so your thumb can easily hit the rear switch. 

    Happy Shooting!
    Tom

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    Windmeister
    Dealer
    Dealer

    Yes. Turning a reg’s set pressure up does really just make it more efficient with very little power increase…unless you swap to a much heavier spring and/or heavier hammer.
    Like you found out, turning it down makes it easier for the spring/hammer combo to knock the valve open and increase dwell time. More power at the cost of inefficient air usage.

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    csdilligaf
    Participant
    Member

    Describing the internals on the impact with “heavier spring/or heavier hammer” I don’t think really applies to the Impact.  From what I gather it is not anything like a regular Poppet valve with a hammer.  Its somewhere between the Huben or the UNI type. But then I could be wrong,   It sure is awesome being able to have such a wide range of Foot pounds of Energy available in one gun.

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    Windmeister
    Dealer
    Dealer

    Even if it doesn’t, the principle of a regulator and releasing air by some means is still there. And since Tom said he had “maxed” everything else out, would seem to indicate some sort of spring preload.

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    ChillyWilly
    Participant
    Member

    Tom,
    Thanks for the videos. Very informative. Quick question; While not fully ambidextrous does the small magazine make much of impact when shouldered in the left shoulder in the  25 cal?
    William

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    Tominco
    Participant
    Member

    ChillyWilly – It’s doable. I just tried it for you and here what I came up with. 
    The cheek piece is not swappable so, you have a harsh (NOT sharp, mind you) edge to rest your cheek on. That’s really the only downside. 
    The small magazine does not interfere at all. when shooting left. 
    I was resting the edge of my cheek on top of large magazine. So, in reality, it is possible to shoot left without any big issues! 
    In fact, by resting your cheek on the large magazine, it might help with positioning your head in the same spot overtime as it gives you another point of contact. Also, you’ll be a little more connected with the magazine so you might be able to hear (through your jaw) when the magazine is empty, or if a pellet happens to load funny. 

    I could see someone making a lefty check rest for this. It would be a tight fit with the big magazine, and it possibly would have to protrude through the cheek rest in order to work. 
    Tom

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    Tominco
    Participant
    Member

    OK, here’s a group finally! I know you guys have been wanting me to shoot groups like crazy. 
    I had a VERY SMALL window of very low winds 0-5mph. So, I grabbed my rifle, changed my barrel and probe, reset my reg, reset my power and valve settings, ran a test crony string .25’s ~905 (~5.5 SD), grabbed some pellets and ran outside. Scope is only held in with 4 screws (I don’t even know if they’re tight!), was maxed out on the elevation knob, and I don’t know if is level because I was getting ready to shoot another video, LOL! :) Shooting off a shaky outdoor table in 32º weather and I’ve had too much caffeine. 

    This metal plate is at 150yds from my shooting bench. 5 shot group of JSB heavies measured 1-5/16″ (1.312″, 33.31mm). (1 shot is behind 1″ line, and 1 is right above 1-5/16″)
    Looking through my pictures, just now, I think that might be the best group I’ve ever shot at that distance! 


    The impacts don’t all look the same because this piece of metal has been painted about 40 times with varying depths of paint from dripping to light haze. 

    HAPPY shooting! 
    Tom

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    rockymtbiker
    Participant
    Member

    At least someone in CO knows how to shoot!!!  Well done, Tom; thanks for sharing.

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    Michael
    Keymaster
    Keymaster

    Wow, that IS some fine shooting there “Wildcat”!

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