250Z Waiting on great upgrade !!

[cosmic]

Waiting on my plenum from AirgunAndy89 !! We will see what it does on my .22.. I sure it will be epic !!

 

[Cantona256]

You’re gonna love it bro. It’ll drop your reg pressure down like 500psi to make the same power as before. I used to get 68fpe at 3k… I’m getting 70fpe at 2.5k psi now.

 

[cosmic]

It is here !! Nicely machined.. Not putting a cover on it... Just need to modify the stock!!!!

 

[Florida_Man]

How does it attach to the rifle?

 

[Dogowski]

How does it attach to the rifle?

Inquiring minds want to know! Pictures? Lol

 

[cosmic]

I will take some in the morning...

 

[cosmic]

Here they are.. Snow sucks!!! Still have to enlarge the stock openings..

 

[cosmic]

I took some pics.. I did forget to take off the protective film of my gauge, it is at 1120 (turned it down for now)..26

 

[Cantona256]

I took some pics.. I did forget to take off the protective film of my gauge, it is at 1120 (turned it down for now)..View attachment 17315View attachment 1731426

That might be too low on the regulator now that the gun has 45cc of plenum…. I believe it’s called hysteresis… so if it’s shooting funny at first don’t worry. Just keep bumping the reg up until it stabilizes.

 

[cosmic]

Yes I just turned it down when I installed the plenum.. Will turn back up to 2500 then tune... The gauge reads in bars so I will up it to 170 bar.. (around 2500 psi )
I used a step drill to open up the stock... Turned out good.. I think I will purchase another digital gauge for the tank pressure..

 

[Cantona256]

Yes I just turned it down when I installed the plenum.. Will turn back up to 2500 then tune... The gauge reads in bars so I will up it to 170 bar.. (around 2500 psi )
I used a step drill to open up the stock... Turned out good.. I think I will purchase another digital gauge for the tank pressure..

I’d start at 2000psi and start tuning from there. The you’re actually tripling the size of the plenum…. My gun is modded in other ways too but I’m doing 70fpe with the regulator at 2500psi right now.

 

[cosmic]

I set it to 160 bar so about 2300 psi...

 

[cosmic]

Thankyou Andy !! Also Cantona for advice....
I degassed the rifle..
Worked my way up from 140 bar (2000 psi ) to 165 (2400 psi ) Maxing at 160 Bar..(2300 psi)
JSB Knockouts 20.83, lots of 1037 fps's...Soon I will start the great accuracy chase..

 

[Dogowski]

Yes I just turned it down when I installed the plenum.. Will turn back up to 2500 then tune... The gauge reads in bars so I will up it to 170 bar.. (around 2500 psi )
I used a step drill to open up the stock... Turned out good.. I think I will purchase another digital gauge for the tank pressure..

Do you have a link to the proper step drill to use on this project? I'm getting ready to install my plenum next. Thank you!

 

[cosmic]

3/16'' to 7/8'' Drill Bit: 12 Steps
You may be able to locate in local stores..

 

[cosmic]

20.83 gr
Weather: 53.9°F 7.0mph scattered clouds 991hPa/mbar 29.26inHg 46%
Shot count: 27
Low: 1014
Hi: 1042
Avg: 1029
STD Dev: 7
Spread: 28
1030,FPS,
1023,FPS,,
1025,FPS,
1023,FPS
1023,FPS,
1021,FPS,
1028,FPS,
1028,FPS,
1025,FPS
1023,FPS
1025,FPS
1023,FPS,
1023,FPS
1023,FPS,
1014,FPS,
1042,FPS
1037,FPS,
1037,FPS,
1030,FPS,
1037,FPS,
1030,FPS
1032,FPS,
1035,FPS
1037,FPS,
1039,FPS
1035,FPS

 

[Dogowski]

20.83 gr
Weather: 53.9°F 7.0mph scattered clouds 991hPa/mbar 29.26inHg 46%
Shot count: 27
Low: 1014
Hi: 1042
Avg: 1029
STD Dev: 7
Spread: 28
1030,FPS,
1023,FPS,,
1025,FPS,
1023,FPS
1023,FPS,
1021,FPS,
1028,FPS,
1028,FPS,
1025,FPS
1023,FPS
1025,FPS
1023,FPS,
1023,FPS
1023,FPS,
1014,FPS,
1042,FPS
1037,FPS,
1037,FPS,
1030,FPS,
1037,FPS,
1030,FPS
1032,FPS,
1035,FPS
1037,FPS,
1039,FPS
1035,FPS

Nice power you've got now brother!

 

[Pumacarl]

20.83 gr
Weather: 53.9°F 7.0mph scattered clouds 991hPa/mbar 29.26inHg 46%
Shot count: 27
Low: 1014
Hi: 1042
Avg: 1029
STD Dev: 7
Spread: 28
1030,FPS,
1023,FPS,,
1025,FPS,
1023,FPS
1023,FPS,
1021,FPS,
1028,FPS,
1028,FPS,
1025,FPS
1023,FPS
1025,FPS
1023,FPS,
1023,FPS
1023,FPS,
1014,FPS,
1042,FPS
1037,FPS,
1037,FPS,
1030,FPS,
1037,FPS,
1030,FPS
1032,FPS,
1035,FPS
1037,FPS,
1039,FPS
1035,FPS

Nice! You are now getting 4fpe more than I get, with an extra shot per fill. This should now give you just enough extra power to try the 25gr KO slugs too, which are a lot easier to get.

 

[Jlodini36]

Where can I buy this Plenum?

 

[pan60]

2Jlodini36 welcome to HAM