Ghost .25cal initial tuning results with 33.95gr JSBs

[Corvid_Hunter]

I had a little time this morning so I degassed the rifle and turned down the reg to about 100 bar. The factory spring on Max gave me 802fps. Black spring 798fps. Red spring 800fps Blue spring 795fps with the sound of excess air coming out the barrel. I then reinstalled the Red spring and started to increase reg pressure. The gauge is rather small and my new glasses aren't in yet, so the pressures are approx. Power Wheel was set on Max.
110 bar - 845fps
120 bar - 857fps
130 bar - 888fps
135 bar - 911fps
140 bar - 918fps
150 bar - 940fps
At 150 bar shots sounded really good, IE efficient and at Min setting it was 824fps and mouse fart quiet with no mod. The factory spring and reg setting had very little sound difference between Min and Max. I'll have to recheck the Min fps when I have more time. When I have the opportunity to get this out to the range I'll post some pics. As far as working on a rifle, they nailed the design and it couldn't be simpler. I did order new Wika gauges, so it should help with tuning.

 

[Pesty3782]

Wika gauges are a must!!

Can’t wait to see some groups with the 25.

Tony P

 

[attk11]

I had a little time this morning so I degassed the rifle and turned down the reg to about 100 bar. The factory spring on Max gave me 802fps. Black spring 798fps. Red spring 800fps Blue spring 795fps with the sound of excess air coming out the barrel. I then reinstalled the Red spring and started to increase reg pressure. The gauge is rather small and my new glasses aren't in yet, so the pressures are approx. Power Wheel was set on Max.
110 bar - 845fps
120 bar - 857fps
130 bar - 888fps
135 bar - 911fps
140 bar - 918fps
150 bar - 940fps
At 150 bar shots sounded really good, IE efficient and at Min setting it was 824fps and mouse fart quiet with no mod. The factory spring and reg setting had very little sound difference between Min and Max. I'll have to recheck the Min fps when I have more time. When I have the opportunity to get this out to the range I'll post some pics. As far as working on a rifle, they nailed the design and it couldn't be simpler. I did order new Wika gauges, so it should help with tuning.

What colour is your factory spring? What made you choose the red spring to reinstall? Also when you look at the back of your gun can you see the spring colour? Is the blue I’m seeing mean that I have a blue spring installed?:

 

[Danman]

What colour is your factory spring? What made you choose the red spring to reinstall? Also when you look at the back of your gun can you see the spring colour? Is the blue I’m seeing mean that I have a blue spring installed?:View attachment 6100

I have the same blue piece in my .22....just noticed it last week

 

[Corvid_Hunter]

What colour is your factory spring? What made you choose the red spring to reinstall? Also when you look at the back of your gun can you see the spring colour? Is the blue I’m seeing mean that I have a blue spring installed?:View attachment 6100

I chose the red spring based on the spring install instructions.



I think 70 ft/lbs is sufficient for the 33.95gr JSB pellets. Here's a good install video.

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[Pesty3782]

You can’t see the spring color because it is behind the power wheel….when you take the PW out you will see where the spring rides.

Tony P