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Author Topic: Walkthrough on tuning a pcp and huma reg.  (Read 134 times)

maddoghutty

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Walkthrough on tuning a pcp and huma reg.
« on: December 06, 2017, 01:35:14 PM »
Hi guys I own a Jkhan Krosa Noblesse bullpup  .22 in 12ftlbs and I would like to know how to successfully tune my rifle in conjunction with the huma reg. I have polished the hammer and cylinder and I know to tune the rifle,  it's all crony work hammer spring adjustment and reg adjustment to get to the lowest fps between shots and lowest fps in extreme spread. Also setting the reg either for shot count or flatter trajectory. I would like someone to tell me what settings do you do first hammer tension or the reg adjustments. Really what I'm asking is for a walkthrough in steps what to do first and in what order thx.


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maddoghutty

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #1 on: December 07, 2017, 12:00:55 PM »
Bob after reading your answer on the topic of tuning a pcp.  I also posted a topic this week and yours has the answers I'm after but would like to know one thing I'm frustrated about, I  purchased my huma reg already preset for my sub 12ftlbs rifle so do I just adjust the hammer spring preload to try and get the 1% es. Or would I have to adjust the reg also. if I do have to adjust the reg also which way do I turn the reg screw. I presume it would be anti clockwise to drop in pressure due to the 12ftlbs setting or would it be clockwise for more pressure. That is the two answers I'm stuck on to get the smallest es on my rifle I can I will look forward to your reply thx.
« Last Edit: December 07, 2017, 12:11:01 PM by maddoghutty »
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rsterne

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #2 on: December 07, 2017, 01:45:47 PM »
Never used a Huma reg, sorry....

Bob
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Motorhead

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #3 on: December 07, 2017, 09:25:08 PM »
wish it was that easy to get 1% ES figures.  fact is you need a valve "System" fine tuned so well that each & every cycle of the gun is a duplicate, even then the 1% figure will be likely skewed by pellets fit & weight preventing it.

In 5 + years of R&D chasing this have achieved it a couple times and the fit & finish along with attention to the smallest details need to be addressed.  For many who seek a quick and simple resolve to what this entails will come up short.

GTA forum likely your best library of R&D / Results for those who went down this path before you.

Have fun  8)
 
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rsterne

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #4 on: December 08, 2017, 08:52:13 AM »
We are asking a lot when we desire less that a 2 ES from our airguns.... Even the best .22LR Match Ammo barely meets a 4% ES.... If you want some good reading, look at this article.... http://carteach0.blogspot.ca/2010/12/testing-22-rim-fire-ammunition-for.html .... The best ES was 39 fps for Eley Match, and the worst was 13%.... If you want a more in depth analysis of Eley Match ammo, check out this article by Geoffrey Kolbe.... http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/velocity_dispersion.htm .... The best he found was an ES of 2.6%.... He quantified the vertical dispersion for .22LR ammo as being about 1mm (0.040") per 3.9 fps.... which works out to just over 1/4" at 50M for the best Eley Match tested....

Is a smaller ES better?.... of course.... Can you shoot good enough to tell?.... I can't if the ES is within 4% at 50 yards and 2% at 100 yards.... Most regulated PCPs can achieve a 2% ES with unsorted pellets.... better than that requires a lot of work, or luck, or both....

Bob
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maddoghutty

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #5 on: December 08, 2017, 07:32:22 PM »
Thx for your replys guys I'm just trying to find out the best way to tune my pcp to get the best accuracy I can from the rifle. I have polished the hammer and cleaned out the air tube but would like to know where do I go from here do I firstly adjust the hammer spring until I get to the smallest es or do I firstly adjust the huma reg until I get a shorter es then fine tune with the hammer spring or is it the other way round. That is what I'm stuck on guys which do I adjust first and test over the crony and then fine tune. Hope you can help guys and shed some light on which you do first thx.
  • Kingston upon Hull, England

rsterne

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #6 on: December 09, 2017, 07:32:30 PM »
When tuning any regulated PCP, I increase the hammer spring preload until the velocity doesn't increase any more (the plateau).... I then back it off until I see about a 5% velocity drop (the knee).... If the velocity is too low, I increase the regulator setpoint, and if higher than I want I reduce it.... Then I fine tune the preload for my final tune....

Bob
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Dairyboy

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Re: Walkthrough on tuning a pcp and huma reg.
« Reply #7 on: Today at 11:21:17 AM »
When tuning any regulated PCP, I increase the hammer spring preload until the velocity doesn't increase any more (the plateau).... I then back it off until I see about a 5% velocity drop (the knee).... If the velocity is too low, I increase the regulator setpoint, and if higher than I want I reduce it.... Then I fine tune the preload for my final tune....

Bob

This is what I do as well...like others said 2% is plenty out to 100yds
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