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S400 Help

Discussion in 'Anything Airgun Related' started by Ricki Bentley, Mar 30, 2020.

  1. Ricki Bentley

    Ricki Bentley Active Member

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    Does anyone no how I can get a little more consistency out my s400 is there some sort of reg or some mod I can bye cheers
     
    TORNADOS7 likes this.
  2. Jesterdog

    Jesterdog Donator

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    In what way is it inconsistent? Too many causes, without more info.
     
  3. jw74

    jw74 Posting Addict

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    What are you filling it to? I found with mine, when i filled it to 190 bar it was erratic. Ended up filling to 165/170 amd and run it down to just over 100. That was the sweet spot. Mine was 177 sub 12
     
  4. no country members

    no country members Tooled up tool

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    S400s are usually more consistent than many regged rifles.

    What are you seeing that tells you otherwise?
     
  5. TORNADOS7

    TORNADOS7 Top Poster

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    First things first, have you inspected the exhaust valve lately ?...

    Just about to replace the one in my .22/410 as the sweet spot has shifted and the power/consistency has dropped slightly...

    Known issue !...

    Ps, first came to my attention when it started to drop the odd shot here and there which is something it's not done before... ;):up:
     
  6. Ricki Bentley

    Ricki Bentley Active Member

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    It not terrible in fact it's a cracking little riffle but I wanna make it pellet on pellet good using aftermarket bits if needs be
     
  7. Ricki Bentley

    Ricki Bentley Active Member

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    I have noticed av lost power it was struggerling last time I was out with it and it was all over not it's normal self I can get a nice grouping normally but last time was terrible to the point we're I packed away and went home sulking
     
    TORNADOS7 likes this.
  8. terry1001

    terry1001 Major Poster

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    It may be due for a good cleaning of the barrel as a dirty bore can cause accuracy to drop off. A chrono would show if the muzzle velocity isn't consistent and would help you to identify the 'sweet spot'. You may find it's time for a service and renewal of seals but it's not possible to diagnose faults like this without all the information.
     
    magicstu likes this.
  9. BallisticBill

    BallisticBill Keyboard Hero

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    Fill to 175bar. Shoot a full string over a chrono until the cylinder pressure falls to 100bar. Post the results and we can tell you if this is normal and, from any abnormalities in the results, what you might need to do. There is no point in fitting a regulator if you can't do basic diagnostics.
     
    magicstu and Ricki Bentley like this.
  10. magicstu

    magicstu Active Member

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    I'd start with the easy stuff and clean the barrel, then give a few shots to bed in again and see how it goes. If no better get the chrono out and see if its a drop in power or accuracy. Clipping silencer ?
     
    Ricki Bentley likes this.
  11. TORNADOS7

    TORNADOS7 Top Poster

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    As I edited in my previous post buddy mine started to drop the odd shot here and there so out came the chrono for a quick check and it's at this point that I noticed the sweet spot had shifted lower down the range and the power had dropped a little too...

    I already knew the valve was on the way out as I'd been inside it last year to reset the pot height and I should've replaced it then but being the impatient sod I am I didn't bother at the time... :rolleyes:

    Anyway, that should be yer starting point, get the basics right first buddy, once that's done then if you should feel the need to take it further that's up to you, I shouldn't have thought you'd need to though, there's a lot more involved in regulating it than just sticking a reg inside, or so I've been told...

    Cloverleaf's yer man for all things S4... ;):up:
     
  12. oedbachgen

    oedbachgen Top Poster

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    190 bar, 150 to 100 bar sweet spot. I did have a Robert Lane one fitted to my 410 was it worth it:shrug:
     

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