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 Post subject: TX200 detune
PostPosted: Sat Oct 10, 2020 4:41 pm 
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Joined: Mon Jan 22, 2018 6:34 pm
Posts: 18
Location: Ontario
Can I detune my TX to the 12 pound limit using the original fac spring. I am going to make a delrin top hat and spring guide. Can I cut a coil or so off the spring Or what spring should I get to start with. My intension is to try my hand at the hunter field target. Thanks in advance for any help.

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Kevman

Benjamin Classic .22
Umarex Colt 1911
QB78D .22
Xisico XS46U .22
AA TX200 .177


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 Post subject: Re: TX200 detune
PostPosted: Sat Oct 10, 2020 9:01 pm 
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Joined: Fri Aug 24, 2007 9:21 pm
Posts: 2274
Location: Greater Napanee, ON, Canada
That is certainly doable. Wondering if the top hat is fairly thick and if there are spacer washers in the gun at present? When you make the dlrin top hat, make the part that extends the length much shorter. I have a variety of top hats from maybe 2to 3mm up to over a centimetre thick. Every 2to 3 mm you take off in length, drops the velocity between 10 and 15 fps. So shortening the top hat and taking out any spacer washes can significantly reduce velocity. Make sure your top hat fits in snug with a friction fit and the guide is also very snug in the spring. The guide should go in easy enough, but maintains contact with the spring over the guide's entire length. That will take all the vibration out and make it smooth.

Cutting a coil off a spring is also ok, just make sure you use a torch to heat the last coil where you cut it and bend it down to touch the next coil. Then grind it to a flat surface at 90 degrees so it is flat against the top hat or guide.

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 Post subject: Re: TX200 detune
PostPosted: Sat Oct 10, 2020 10:42 pm 
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Joined: Sun May 20, 2007 10:26 pm
Posts: 373
Location: Any Town ONTARIO
The hunter class is 20 foot pounds .


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 Post subject: Re: TX200 detune
PostPosted: Sat Oct 10, 2020 10:52 pm 
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Joined: Sat Jan 12, 2019 10:57 am
Posts: 143
Location: Ontario north of GTA
If you want to shoot WFTF class then yes detune. But Hunter class allows up to 20 FPE so you can shoot hunter without having to change your set up. I don't think you would be over 20 FPE in .177 fac. just a heads up incase you did not know this.


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 Post subject: Re: TX200 detune
PostPosted: Sun Oct 11, 2020 7:22 am 
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Joined: Mon Jan 22, 2018 6:34 pm
Posts: 18
Location: Ontario
Attachment:
chrony pic.png
chrony pic.png [ 23.1 KiB | Viewed 194 times ]
I am impressed with the way this gun shoots now, I am looking to smooth it out a bit and gain as much mechanical advantage I can get to help with my short comings. This is what it is shooting now. I think I would need to drop approximately 100fps. What ever I do I would like to duplicate so I can have a back up spring should one fail. Is there a spring available I could buy without buying a complete tune kit? I am not against buying one I just enjoy making my own parts. Thanks again.

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Kevman

Benjamin Classic .22
Umarex Colt 1911
QB78D .22
Xisico XS46U .22
AA TX200 .177


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 Post subject: Re: TX200 detune
PostPosted: Sun Oct 11, 2020 11:02 am 
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Joined: Sat Feb 28, 2009 12:28 pm
Posts: 707
Kevin Loder wrote:
Attachment:
chrony pic.png
I am impressed with the way this gun shoots now, I am looking to smooth it out a bit and gain as much mechanical advantage I can get to help with my short comings. This is what it is shooting now. I think I would need to drop approximately 100fps. What ever I do I would like to duplicate so I can have a back up spring should one fail. Is there a spring available I could buy without buying a complete tune kit? I am not against buying one I just enjoy making my own parts. Thanks again.



See if Airgunsource has a factory 12 fpe. spring,they used to carry them,kelly


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 Post subject: Re: TX200 detune
PostPosted: Sun Oct 11, 2020 11:09 am 
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Joined: Fri Aug 24, 2007 9:21 pm
Posts: 2274
Location: Greater Napanee, ON, Canada
Try to contact Travis at Air Gun Source to see if he can get the 12 ft/lb springs like all the British rifles have in them. Failing that, maybe a British dealer would sell you a couple. Not sure if anyone in Canada stocks them.

Going with the sub 12 ft/lb is the way to go in my opinion. You can use higher power, but the guys winning events are shooting the 12 ft/lb guns. I think Joel, our top Canadian shooter, is shooting in the area of 740 - 750 fps with the 8.44 pellets. He certainly is not having any issues with accuracy. I try to keep all my TX guns shooting between 10 and 11 ft/lb and I like them that way. My hunter carbine is shooting the 8.44 at about 785 - 790, so it is due for a tweak to get it down to a max of 760 fps.

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 Post subject: Re: TX200 detune
PostPosted: Sun Oct 11, 2020 8:18 pm 
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Joined: Fri Aug 24, 2007 9:21 pm
Posts: 2274
Location: Greater Napanee, ON, Canada
Opened up my carbine today and removed the one spacing washer that was in it. Shooting at 770 now with the 8.44s. Hope it will settle in and drop a few fps over the next thousand shots or so. It is at about 11.1 ft/lb, so that is ok with me for now.

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Tim
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 Post subject: Re: TX200 detune
PostPosted: Wed Oct 14, 2020 5:40 pm 
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Joined: Mon Jan 22, 2018 6:34 pm
Posts: 18
Location: Ontario
Ordered 2 springs from AGS. I will let you know how I make out. Thanks everyone.

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Kevman

Benjamin Classic .22
Umarex Colt 1911
QB78D .22
Xisico XS46U .22
AA TX200 .177


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