950fps (34gr) with 110-120 bars possible?

[ImpactX]

I see people saying they are getting 950 fps and over using 34gr pellet/slug with 110-120 bar on their impacts. Mine can't even get close using such a low reg pressure. Am I doing something wrong. The only way to get up to 950 fps with the 34 gr is to crank up my reg to 150 bar. 

My impact is the impact X 2018 version 600mm slug liner A.

I upgraded to the huma dual transfer port. I upgrade stock fx probe to the slug power kit. I upgrade my plenum to the fx mk2 power plenum. Even with all these I have to set my reg to 150 bar to get up to 950 fps. How is it possible that people are getting over 950 fps with 110-120 bar. Are the new impact that much more powerful or what. Even with all my upgrades I can't get that power at that low reg pressure. 

 

[Airgunmann]

My mk2 with 700 set at between 110 and 115 was at 930 ish with the 34 mk2 pellets so yeah I'm running the Huma probe and on the slug side of the newer FX transfer port

 

[Airgunmann]

Mines mk2 power plenum but a 700 mm barrel makes a difference also

 

[corny]

I was tuned to 895 with 100bar reg. 
I believe the max at that reg pressure was 925.

700mm barrel standard pellet probe and port. 

 

[Airgunmann]

Yeah 930 was pretty easy to get to I backed off a tad on the hammer and then used valve adjuster to settle at about 905 ish slugs push harder if that's what your trying to achieve 

 

[M0ist0ne]

What caliber? That comes into play as well. 

 

[Airgunmann]

I'm talking 25 cal 

 

[ImpactX]

What caliber? That comes into play as well.

34gn jsb is .25 cal mk2

 

[M0ist0ne]

What caliber? That comes into play as well.

34gn jsb is .25 cal mk2

On my MK2, I'm at about a 127 reg to hit 920, but if I open up the valve to line 4 and turn my hammer up, it's at 960. 600mm with a slug a liner. 

Wasn't there a change in the valve with the impact x vs mk2? Was before I got into pcps tho, so I'm not sure what other changes the impact went through with earlier models.

 

[Airgunmann]

Didn't that change with install of power plenum upgrade?

 

[Airgunmann]

If valve adjuster isn't open far enough like you said you wouldn't get there either 

 

[bigHUN]

It is not enough to replace some readily available "upgrade this-and-that" parts from shelfs, you need also a lot of play with springs....

Today I wanted to re-tune my .25 MK2 but I just did only ten shots and stopped, maybe tomorrow I will finish the tune. Anyway

124 bars 948 fps 41 grain ZAN slugs and still about 2mm on HS, but I know that I shall have about 950 with 44 grain. This is a result of tons of trial and errors and tons of tinkering, also re-machining parts and extreme porting.