Power boost for AA ...
 

Power boost for AA S400 Carbine?  

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daved20319
(@daved20319)
Joined: 2 years ago
Posts: 3
2018-04-12 14:22:14  

First post on the new forum (I think), way to go Steve!  Kind of went all in on powder burners in the last year, so most of the air guns have gone away.  But it's coming up on garden protection season, so time to dust off what I have left.

So I have an S400 Carbine that was converted to a "pistol" by Peter (can't remember the last name) from Top Gun Airgun (?).  It's currently installed in a rifle stock, and makes a nice little ultra-carbine, but the power is very low, haven't actually chronied it, but it won't sink a pellet full depth in Duct-seal at 10 feet.  Everything I can find on Google points me to Brit sites, and they flatly refuse to discuss anything to do with increasing power.  I've played with the "pot", but it hasn't made much difference, although I wouldn't mind some specifics on that.  What else can I do?  Don't really care about shot count, it's got a tiny (cut-down) air tube, so pumping it back up really isn't that big a deal.  It's a .177 if that matters.  Not looking to turn it into a hammer, but something in the 12-15 FPE range would be nice.  Thanks.

Dave


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Shambozzie
(@tharris281sc-rr-com)
Joined: 2 years ago
Posts: 107
2018-04-14 07:23:56  

Go to GTA forum. Complete tear down, tune rebuild with photos by Dfwdude. Everything you want to know aa/cz 200 related.


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T-Higgs
(@t-higgs)
Joined: 2 years ago
Posts: 47
2018-04-14 07:29:50  

Hi Dave,

ill attempt an answer. Not knowing how your airgun Smith detuned your rifle, I’ll point out what I did to my S400. My rifle was shooting in 29-31 FPE range when I got it. I wanted to tune down the power. After much research, the common way to do this was to install a huma regulator , which I’m running at 120psi and to remove weight from the hammer which my buddy did on his lathe. This lighter hammer strikes the valve with less energy letting less air through the valve hence less FPS. After lightening the hammer, I was still getting higher FPE than I wanted so I replaced the hammer spring with a softer spring I bought from a local hardware store with a little specialty spring section. This made a big difference and dropped my power to an acceptable level. So, I don’t know what your tuner did but you can look at your hammer and see if it’s stock or altered and maybe replace the hammer spring. You can buy a new hammer for about 40$ and a stock spring too. If the gun is regulated, you can adjust it for higher psi. Just some general info from my experience. 

Here is a pic of my hammer after material removal, and the stock spring next to the one I replaced it with  

A058450B DE2D 463E 9F7A CFC0D25DCCAA

Shoot long enough and you’ll have a one hole group...


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daved20319
(@daved20319)
Joined: 2 years ago
Posts: 3
2018-04-14 09:52:18  

Thanks, guys.  Shambozzle, I'm dealing with an S400, not a 200.  Totally different critters, I could wish it was a 200, they're very easy to work on, and I'm very familiar with them.  Never should have sold the one I had.

T-higgs, as far as I know, this thing is stock.  I was doing a bit more digging last night, part of the issue maybe charge level, seems the lower powered versions work better at lower pressure.  Not a heart breaker if true, I fill with a pump these days.  It's looking like I really need to get the new chronograph set up, it's only been about a year since I got it  🙄 .  Just in case, I also have an FAC spring on order, and if I need to machine some parts, like a hammer or pot, no problem.  Later.

Dave


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Shambozzie
(@tharris281sc-rr-com)
Joined: 2 years ago
Posts: 107
2018-04-14 15:53:26  

My bad.


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Rob in NC
(@rob-in-nc)
Joined: 2 years ago
Posts: 178
2018-04-14 18:47:11  

So you're the one...haha... I looked at that pistol for several days before deciding to snag it and ...it was sold.

No good advice for you, just a bit jealous. Was a nice looking rig. 

All those who believe in psychokinesis, raise my hand.

Good judgment comes from experience; experience usually comes from bad judgment.


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