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tuning the QBXS 78

Discussion in 'Anything Airgun Related' started by scottroutledge, Jun 15, 2014.

  1. scottroutledge

    scottroutledge Engaging Member

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    Hi all really need some help? Does anyone have any tips on how to tune the Smk QBXS 78 had mine chronyd today and it is apparently only doing 6.5 ftlbs which I found hard to believe as it's had a new seal kit fitted and the transfer port replaced and enlarged!! Please someone help me!! It's doing my head in!
     
  2. vitalich

    vitalich Keyboard Hero

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    The best way is to tead chineseairgggunforrrum
     
  3. SteveO

    SteveO Top Poster

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    Hi Scott,

    Tuning your particular gun is not something we can discuss openly on the forum (forum etiquette) as the same knowledge can be used by unscrupulous owners to illegally over power their rifles.

    Altering the transfer port on any gun without knowing exactly what you are doing is likely to cause you problems and I suspect that is where you problem lies, these guns can produce silly power without messing with the TP, why was this modified and by whom? Was it the seal that was enlarged or was the TP actually drilled out?
     
  4. Honest Bob

    Honest Bob Big Poster

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    As above. But if you do want to tune it, plenty of U tube vids + Chinese air gun forum. Bin there done that = wasted money + lots of that awful expensive, temperature sensitive inconsistent Co2. Am now cured of all things Co2. Atb, Bob.
     
    Last edited: Jun 15, 2014
  5. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    1) Buy a Chrono, be it a Combro, Xcortech X3200, F!, Alpha, Chrony whatever. You start tuning you must have one else you may wind up with an overpowered rifle.

    2) The T R Robb kit is a very easy way to get close to 11, just take care as recklessly fitting all the parts can result in about 14 ft lb!

    3) Follow tips on the Chinese airgun forum (there are several nown to work tips) or you tube (Russian Roulette as to if it works, how successful it will be and what power your gun will be after).
     
  6. robs5230

    robs5230 Oversprung

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    woodfield gun care sell seal kits. join the ukchineseairgunforum for good advice. i don't think the op is out of order for asking advice when he states his rifle is only achieving half the legal limit. there is plenty of talk on here about transfer port enlargement and replacement springs and a lot of after market springs need a chop to stay legal.. the 78 as most air rifles can be made to shoot nicely at 11 ft'lbs, they just need a little more work than most.
     
  7. spike589715

    spike589715 Busy Member

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    You do need a crono ..
    you can easily diy tune to the legal power without really spending any money
    just some hand tools and time some wet and dry a dremal bit etc
    the Chinese forum is the place to find guides etc
    I have 4 all HPA and all around 11 ft lbs
    can be made into nice guns
    enjoy
    si
     
  8. Greg1983

    Greg1983 Busy Member

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    dont waste money buying a tune up kits for the .22 version they only require a new seals kit! The rest is down to a clean and polish mate, now the .177 version is tricky they require more...
     
  9. gunsnlandies

    gunsnlandies Posting Addict

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    As has been stated, if it's a .177 these take a bit of fettling. If the TP seal was to long when fitted it may have collapsed under tightening and now gives restricted gas flow. This is a common problem, and of course you can't really spot the problem from just looking at the outside. My TH78 .22 runs at a nice 11.5 on co2 with some work done to it. My AR2079A .177 runs at 11.5, but has had a lot of mods and now runs on HPA. This started at 6-6.5.
    UKCAF is the place to get the answers for a full tune up.
    Brian
     
  10. scottroutledge

    scottroutledge Engaging Member

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    Thanks for all the feedback lads gunna get this stripped and start fettling it this afternoon will let you know how I get on. As forvmy ratty 9 ftlbs seems very respectable for this little gun what do you think?
     
  11. jantar

    jantar Donator

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    Got to agree with that....the increase in size of the transfer port has probably made it worse. There are tuning kits available from a few sellers (I have used them) and if you follow the instructions to the letter it is virtually guaranteed to work. Google QB78 tuning and see what pops up.........its how I found the info and sellers!
     
  12. ped

    ped Big Poster

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    try fitting a crosman tp gasket(crosman part no 130-036) in place of the ptfe tp that it sounds like you've got fitted at present
    as the xs78 is a direct copy of a crosman 160 some parts from a 22xx can be used and vice versa but the advice to join ukcaf is your best bet
    ped
     
  13. scottroutledge

    scottroutledge Engaging Member

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    Ok so stripped the damn thing tonight and changed the tp seal again! It's shooting a lot better but still don't think it's anywhere over 10 tbh! Thanks again for the tips and help guys really appreciate it. Looked on other suggested forum but try not to visit often as those lads and their guns just keep giving me more and more ideas of things to do and ways to spend more money! I guess they don't know that I already have crosmanitis lol!
    Scott
     
  14. spike589715

    spike589715 Busy Member

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    Hi
    you really can tune the gun for almost no money ...
    you can of course get in to HPA barrel changes etc ......
    I have a few on my site in various states of tune
    cheers
    si
     

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