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FX Impact Power Plenum .22 settings
- Thread starter ddark
- Start date
NathanielAccuracy:
Member
Hello,
I could finally change my hammer spring and test it with the 56.6mm original MKII spring. Well, thta's another story. I finally got the power increase I was expecting.
Just changing the spring gave me 277m/s (908fps) with the same reg setting (around 120 bars). And this time, I could increase the reg pressure and got enough spring strength to open the valve. With the reg set between 140 and 150 bars, I now get 287 m/s (941fps), which should be ok to test some .30 cal slugs. I couldn't test anything for consistency and accuracy at those speeds, the weather is just awful: rain and wind all over the place! I can't take my stuff out and do some decent testing for the moment.
Upvote 0
Hello fromm Greece.
I have the impact mk1 and upgrade it to mk2 with the following settings-
Barrel 48mm smooth twist
regulator at 120 bars
power wheel to 1 (18.16mm)
valve on 2,5 bars
avg velocity 935 fps
pellets jsb 18.13 grains
external plenum 50cc
upgrade plenum of mk2
That is the best settings i could get after a lot of testings from 100 bars to 120.
Thank you.
I have the impact mk1 and upgrade it to mk2 with the following settings-
Barrel 48mm smooth twist
regulator at 120 bars
power wheel to 1 (18.16mm)
valve on 2,5 bars
avg velocity 935 fps
pellets jsb 18.13 grains
external plenum 50cc
upgrade plenum of mk2
That is the best settings i could get after a lot of testings from 100 bars to 120.
Thank you.
Upvote 0
Cutting the valve spring as vadimas says
or replacing the hummer spring with original ?
2 springs in the PP kit
or replacing the hummer spring with original ?
2 springs in the PP kit
Upvote 0
Cutting the valve spring as vadimas says
or replacing the hummer spring with original ?
2 springs in the PP kit
Both solutions are good.
It’s up to you.
Upvote 0
Accuracy:
Member
Hello,
I could finally change my hammer spring and test it with the 56.6mm original MKII spring. Well, thta's another story. I finally got the power increase I was expecting.
Just changing the spring gave me 277m/s (908fps) with the same reg setting (around 120 bars). And this time, I could increase the reg pressure and got enough spring strength to open the valve. With the reg set between 140 and 150 bars, I now get 287 m/s (941fps), which should be ok to test some .30 cal slugs. I couldn't test anything for consistency and accuracy at those speeds, the weather is just awful: rain and wind all over the place! I can't take my stuff out and do some decent testing for the moment.
You know what's funny?
The original, shorter PP spring is actually stiffer than the 57mm old spring.
The dimensions are exactly the same, except the pitch of the new spring is a bit smaller.
I've measured both springs with a digital kitchen scale, and the digital readout of my milling machine.
when both are compressed for 10mm, the old longer spring gave 3415gr and the new PP spring 3560gr.
The advantage of the new PP spring is that your adjustment range between "min" and "max" on the power wheel is bigger because of the higher spring rate.
With the old spring I found out that it is almost impossible to dial down with lower reg. settings.
Upvote 0
Interesting, The wire gauge, the outer diameter and active coils being the same. Only a 3mm height difference. Why is there a improvement in speed?
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my reg must be restricted because I can only get 105 bar. seen on net that I need to slightly tighten the nut on the reg . is it easy enough to take the reg out
Upvote 0