Fx impact regulator issue after plenum install

Does that amount of variation affect accuracy? My guess, unless you are shooting at extreme ranges, it will not be a problem. I realize we all like stuff to work perfectly, but often it does not.

What you’re seeing is its input regulation. 7 bar variation for a 130 bar setpoint equates to about 5% which isn’t enough to produce a meaningful change in the extreme spread, provided the hammer strike is adjusted to deliver about 97% of max velocity.

Did you check the gauge?

Give the indians their land back!

If your bullet speed is the same, you should not pay attention.

I always adapt in some way, let's say the bullet speed is 290m / s, 140 bar 36gr slug.

I do 145 bars + 5 bar. and screw a little valve,

despite the fluctuation of the regulator, your speed will always be stable.

even more troubles after installing the kit. (Not my video) t)he guy needs to replace a few bits and parts that came with the kit! 

Sorry, but my English isn’t perfect. If i understand him correctly, he replaced the hammer spring guide and an O-ring that came with the kit. 





https://youtu.be/dTEIqq5qC44

I can’t see any power plenum or parts that comes with the kit??

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After installing the large plenum when I fill the bottle to 250b from 150b the regulator gauge will go up 5 to 7 bars. For example the reg is set at 130b when the bottle is full at 250b, when the bottle go down to 200b the reg will go down a bit to 126 and so on.

It's more pronounced in Huma regulator, so I installed fx reg back and it's a bit better but still there. I tried new washers, didn't help. Any help is appreciated

you read my mind i was about to post the same issue

mine is around 4-5bar variation so i fill to 200

but on the chrono 

i cant see any variation did you ?

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I

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Give the indians their land back!

Is the hammer spring tension adjusted to deliver 97% of peak velocity? Sounds like it’s tuned further down on the slope.

What you’re seeing is its input regulation. 7 bar variation for a 130 bar setpoint equates to about 5% which isn’t enough to produce a meaningful change in the extreme spread, provided the hammer strike is adjusted to deliver about 97% of max velocity.

Click to expand...

Is the hammer spring tension adjusted to deliver 97% of peak velocity? Sounds like it’s tuned further down on the slope.

Click to expand...

I agree

“Tuned for maximum velocity...”

That will indeed make it sensitive to small variations in output pressure. As mentioned, try backing down the HST until it’s at about 97% of the max and not only will the ES shrink, it will be considerably more efficient.

No regulator is perfect. Fortunately they don’t have to be.

Maybe you can try to tune the gun with a litle more sprintesion on the valve adjuster?

You probably then has to increase hammer spring tension also.

That’s a good point…any of the tuning tricks that help you get a broader, longer bell curve in a conventional (unregulated) PCP also make a regulated one more agnostic of slight pressure variations. One of those things as you mentioned is a stiffer valve return spring. Another example would be restricting the transfer port. 

In the vast majority of cases it will be possible to get a tight ES by simply dialing in the HST to the velocity knee which is why I always recommend starting there, but do keep these other things in mind. To give some perspective, it’s not uncommon to tune a conventional PCP for a bell curve that will maintain a 2% ES over a pressure range of 400-500psi (27 – 34 bar). That’s why a regulator variation of 100psi (7 bar) is deemed insignificant.

Is the HUMA new? If so, you know they need time to settle in, right?



Crusher