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Aa Pro Sport Tuning

Discussion in 'Technical' started by Farmer Rick, Dec 21, 2020.

  1. Farmer Rick

    Farmer Rick Engaging Member

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    Hi all,

    Ive been shooting the pro sport for the last week or so and have near 1000 pellets through it. Overall I'm really happy with it, and when I do everything "well" can return groups around 9mm spread @ 25 yrds - but I do find it a little "snappy" at times, so I'm thinking of doing a tune to help calm it down a bit.

    What would you recommend?

    p.s. it does have a little squeak when cocking now...
     
  2. Farmer Rick

    Farmer Rick Engaging Member

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    Here’s a quick shot from some pellet testing - top line is the best I could get with jsb 4.53

    line below is jsb rs’s.
     

    Attached Files:

    Kj1 likes this.
  3. Plinky Dave

    Plinky Dave Posting Addict

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    Rick,
    I’ve tried Exact, Express and RS I’m my PS, the shot cycle is different for each of them. I fettled the spring length and top hat weight to balance the out put with the lighter pellet being a wee bit more than with the heavier one to have a wee bit of piston bounce. So as a starter, chrono to find the FPS of each them then fine fettle the spring to get a bit more with the lighter pellet than heavy. Around 10.5lbsft shoots smooth and either Express or RS do well at 30 yds in mine, Exacts were less good.
    A clean, polish and lube of the spring/guides with good moly will also help before chrony and get rid of the squeak. Just my process for what it’s worth.
    Dave
    Edit: AADF at 8.4 gn not exacts.
     
    Farmer Rick likes this.
  4. Farmer Rick

    Farmer Rick Engaging Member

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    @Plinky Dave thanks for the info. I feel like that’s a whole new dimension of technical understand than I currently have!! As much advice and knowledge you could impart if greatly appreciated. Have you modified the internals? How would you “fettle” the spring?
     
  5. Plinky Dave

    Plinky Dave Posting Addict

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    Rick, if you run a search there is loads of top advice for the spring.
    For my prosport which is a few years old and third hand at least it had an aftermarket spring guide installed but it wasn’t a good fit so it twanged a bit. I fitted a TBT spring and matched guide which got rid of the twang but the FPS was too hot and the shot cycle wasn’t nice. Two ways to fettle the spring, cut a coil off then re square the end and polish it up so it spins easily on the guide, it takes a bit of trial And error so maybes only half a coil at a time. To square it heat the end coil to cherry red and collapse it square, I use an old steel spring guide as template, but careful just a wee tiny bit at a time, this can also reduce the spring length and therefore the preload reducing the power and smoothing the shot cycle. If you go too far a preload washer can be added to bring it back. Always collapse at the aft end of the coil and let it air cool never quench it. Polish the spring ends with 200-600 grade wet and dry. It is a time consuming process but you can tell the difference when you hit the sweet spot. Google both cutting and collapsing and watch the TBT videos too.
    Edit: you can also play the FPS by adjusting piston weight but the PS is already pretty well tuned from new. I tried a combination of the cut spring but with four different top hat sizes and weights. A standard 13mm steel a cut down 6mm steel a 7mm delrin and a 3mm delrin. The delrin was too light and lost power the standard was too heavy and had more surge (recoil) the 6mm - I cut back from a 13mm standard- was just right to get a bit of piston bounce.
    Dave
     
    Last edited: Dec 21, 2020
    Farmer Rick likes this.
  6. Farmer Rick

    Farmer Rick Engaging Member

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    @Plinky Dave ive been researching for a while about it and have watched the videos from tbt. Who is it that makes the full drop in piston rather than the kits? So un-tuned the heavier pellets calm the cycle a little? I’m wondering if that’s why the tighter pellets seem to work better also... I trialed some accupell and there were really tight but shot well...
     
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  7. Plinky Dave

    Plinky Dave Posting Addict

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    Rick,just sent you some stuff by PM - Tony Leach does the full 22mm conversion piston.
    Dave
     
    Farmer Rick likes this.
  8. Farmer Rick

    Farmer Rick Engaging Member

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    Super thank you!
     
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  9. shergar

    shergar Big Poster

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    Contact @shauny for a Titan 10 spring with matching guides. In 177 this will shoot close to 12 fpe. without heavy steel top hat, making for a smoother shot cycle and leaving more room for spring.
    The TL 22 mm conversion is very good but needs experience to install and set up correctly.
     
    Plinky Dave and shauny like this.
  10. shauny

    shauny Top Poster

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    farmer rick, you have a pm.....:)
     

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    D@N1982, greyskull, john79 and 2 others like this.
  11. Plinky Dave

    Plinky Dave Posting Addict

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    I’d be interested to hear how the rifle shoots with the slick Shauny guide set and titan installed.
     
    Farmer Rick likes this.
  12. Farmer Rick

    Farmer Rick Engaging Member

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  13. MartinC

    MartinC Well-Known Member

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    I have a Tony Leach 22mm conversion and all I can say is a good rifle is now a superb pcp accurate pellet on pellet laser beam shooter, the best £190 I've spent on a rifle, still a little recoil but hits where it pointing. My Pro Sport is now one of my top guns, my buddy has a 21mm kit in a Tx200 and that is superb too, happy shooting.
     
    Plinky Dave likes this.
  14. StellaArtois Sr

    StellaArtois Sr Rifle Whore

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    To be honest tuning a ProSport for boing and power is quite simple, and doesn't cost a fortune.

    Firstly as it is snappy get it chronoed and see what it's putting out. if it is well over 11 then consider
    reducing it to about 11. I have tried fitting short strokes kits and I personally didn't like them.

    Probably the easiest thing to do with a ProSport and a TX200 is replace the metal guide and top hat with
    delrin ones. I have had a few of Shauny and they do the job from a boing to a nice dull thud.

    If it is overpowered you will need to reduce the spring by removing a coil or compressing one depending how
    far over it is.

    Another way to reduce noise in a springer is to fit a piston sleeve. However I have found with all the ProSports
    and TX200s there is no space to fit a sleeve in it. So good fitting guides will work for you.
    Another good thing with a ProSport is they are very easy to work on.

    After fitting guides or doing most internal work make sure you get it chronoed after working on it.

    Ade :thumb:
     
    shergar and Plinky Dave like this.
  15. shergar

    shergar Big Poster

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    Fitted @shauny guides and Titan 10 spring to TX 200 HC 177. At first a little hot, but scragging spring reduced length from 230 mm to 225 at which it was doing circa 11.5. Much smoother action than with the large steel top hat. Action can be speeded by short stroke with extended latch rod. I found the full 14 mm to feel awkward. Underlever stopped at 3 o clock, one click on ATB. With Mk3 action taking cocking lever to 5 o clock, 3 clicks, a 9 mm short stroke allows cocking lever travel to 4 o clock and 2 clicks on ATB. Accuracy of short stroke maintained without excessive preload, making cocking with short HC underlever easy.
    The TL 22 mm conversion works well at 10.5 and below, giving no more than a gentle nudge on firing. Trying for higher power tends to negate the principles on which it was designed.
    This is my experience, based on just 3 guns, the process is on going and the views of others will be greatly appreciated.
     

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