Tuning FX Impact Power Wheel

[kball]

I have a .22 FX Impact (purchased in 2017) with a brand new PP mod. Question; How much change in FPS should there be from MAX to MIN setting on the wheel or does this depend on the set up(pellet weight, barrel length reg pressure etc.)? I know specific numbers probably aren't possible but should this number be in the 20FPS range or 100FPS range.

Thanks for the help

 

[Glem.Chally]

Really depends on your tune, reg pressure and what your little set screw for the hammer wheel is set at. But should be over 100 between min and max again it depends.

 

[2D1C]

Glem is dead on. My .25 has a spread of 780 to 915 @ 140bar

 

[tor47]

It also depends on what hammer spring you used when you installed the powerplenum. You have the option of using the original one, or the one which came with the plenum. They have different length.

 

[kball]

Thanks for the input. Right now I don't have that much range on the wheel. I'm thinking I should slowly back off the set screw and see if that will increase the spread?

 

[tor47]

After a powerplenum install, you can probably use lower regpressure than the gun used before. I think the best option is for you to decide what max speed you want on the pellet you are using, and follow FX masterclass video https://www.youtube.com/watch?v=9K9uG2KOPt0.

Then you are adjusting the wheel and reg for the desired speed range you want. If you are planning shooting different weights of pellets, then you can to adjust the gun for the heaviest pellet, and use both wheel and valve adjuster to fine adjust when shooting lighter pellets.

Just beware, if you are unsure the gun has the latest generation of reg, it is probably best to unscrew bottle and empty the plenum of air before adjusting down the reg. You have less risk damaging the reg, if you only adjust the pressure up, when gun is pressurised. Better to be on the safe side, than risk damaging the gun