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 Post subject: QB78 bulk air build
PostPosted: Sun Jan 13, 2019 7:56 pm 
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Joined: Mon Mar 27, 2017 7:06 pm
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Location: Meaford, Ont.
What would be the speed difference on a full power stock QB78S with a 1100psi and a 850psi regulator? Going to go high pressure air I think. Gun on 2- 12g CO2 presently shoots 650FPS. Got the bulk air fitting coming from the forum store. Plan on leaving tank tethered to the gun. Likely begin with just a hand pump.

CHEERS!


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 13, 2019 8:21 pm 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2690
Location: Caronport, Saskatchewan
It'll make quite a difference I think. That's 177?
Even the 850psi regulator should bump up the velocity a bit to 700fps maybe, and the 1100 should get you another 100fps, but I'm guessing now as I haven't had a 177 version. I'd recommend taking out the fiber filter to save problems later. Replacing the rubber port with something a little bigger would help too if you aren't happy with what you get for velocity.

Sent from my EML-L09 using Tapatalk


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 13, 2019 8:33 pm 
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Location: Meaford, Ont.
wesb2007 wrote:
It'll make quite a difference I think. That's 177?
Even the 850psi regulator should bump up the velocity a bit to 700fps maybe, and the 1100 should get you another 100fps, but I'm guessing now as I haven't had a 177 version. I'd recommend taking out the fiber filter to save problems later. Replacing the rubber port with something a little bigger would help too if you aren't happy with what you get for velocity.

Sent from my EML-L09 using Tapatalk

Yes on the .177. I am happy with 600-650FPS but 700FPS is ok. Don't want it faster for my shooting range. Range master might shut me down if it is to loud. She has tender ears and don't want to wear ear plugs. :rolleyes:

:lol:


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 13, 2019 8:36 pm 
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Posts: 156
850psi HPA will shoot a little faster than CO2 at the same pressure (maybe 700fps?). 1100psi around 800fps?

Edit: looks like I was late to the party...


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 13, 2019 8:48 pm 
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Posts: 822
Location: Meaford, Ont.
987654321 wrote:
850psi HPA will shoot a little faster than CO2 at the same pressure (maybe 700fps?). 1100psi around 800fps?

Edit: looks like I was late to the party...


I appreciate all help in my new indever into this new experience. Starting slow. CHEERS!


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 3:33 pm 
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Posts: 31
Location: Maple Ridge, BC
wheeliehd wrote:
Got the bulk air fitting coming from the forum store.

Hey there, i have a couple questions regarding the bulk air fitting that can maybe be answered in this thread.

Im wondering if i can use the fitting to fill the main tube of my qb78 with air directly with a hand pump? If so what would i need to do this safely, as in monitoring how much pressure has been pumped into the gun. Also curious if anyone knows approximately how many shots id get with the tube filled to about the same pressure as co2.... its a 177 cal gun.

Im not interested in getting more power from the gun im just looking for ways to cut my reliance on co2 and get more consistent velocities in cold weather.

Any info is appreciated :)


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 3:58 pm 
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Location: Caronport, Saskatchewan
You can safely fill your tube to 1500psi and with a hand pump up to 1800psi. Be careful not to go over 1800psi.
If you keep it stock otherwise you'll probably be shooting around 700fps or so, depending on the pellets and whether it is a PAL rated gun in co2 or not. You won't get a pile of consistent shots, maybe 10-15? If you detuned it to keep it around 500fps, by trimming down your hammer spring or putting in a lighter spring, (and if it's pal rated, swapping the port for a smaller one), then you should get around 40-50 consistent shots. If you aren't adding an auxiliary tank and using air, it'll be more useful as a low power gun imo.
Regards,
Wes

Sent from my EML-L09 using Tapatalk


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 4:37 pm 
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Posts: 822
Location: Meaford, Ont.
Sevensson wrote:
wheeliehd wrote:
Got the bulk air fitting coming from the forum store.

Hey there, i have a couple questions regarding the bulk air fitting that can maybe be answered in this thread.

Im wondering if i can use the fitting to fill the main tube of my qb78 with air directly with a hand pump? If so what would i need to do this safely, as in monitoring how much pressure has been pumped into the gun. Also curious if anyone knows approximately how many shots id get with the tube filled to about the same pressure as co2.... its a 177 cal gun.

Im not interested in getting more power from the gun im just looking for ways to cut my reliance on co2 and get more consistent velocities in cold weather.

Any info is appreciated :)

The fitting from the forum store I got you would have to keep the tank attached to the gun. So no you can not fill the gun with a hand pump directly. Fill a tank and leave it attached. I think this is what you are asking. Want no tank that is a PCP or a different fitting. CHEERS!


Last edited by wheeliehd on Sun Jan 20, 2019 4:46 pm, edited 1 time in total.

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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 4:45 pm 
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Joined: Mon Nov 19, 2018 7:39 pm
Posts: 31
Location: Maple Ridge, BC
wesb2007 wrote:
You can safely fill your tube to 1500psi and with a hand pump up to 1800psi. Be careful not to go over 1800psi.
If you keep it stock otherwise you'll probably be shooting around 700fps or so, depending on the pellets and whether it is a PAL rated gun in co2 or not. You won't get a pile of consistent shots, maybe 10-15? If you detuned it to keep it around 500fps, by trimming down your hammer spring or putting in a lighter spring, (and if it's pal rated, swapping the port for a smaller one), then you should get around 40-50 consistent shots. If you aren't adding an auxiliary tank and using air, it'll be more useful as a low power gun imo.
Regards,
Wes

Sent from my EML-L09 using Tapatalk


Thanks for the quick response Wes. the gun in question is shooting just under 500fps on co2 and i have no problem detuning it for air if necessary to get more shots, im using it for short range field target (inside 100 feet) so consistent shots are more important than powerful ones... so can i simply screw a male foster fitting (assuming my pump has a female fitting) into the bulk fill adapter in question and im good to go?


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 4:50 pm 
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Joined: Mon Nov 19, 2018 7:39 pm
Posts: 31
Location: Maple Ridge, BC
wheeliehd wrote:
Sevensson wrote:
wheeliehd wrote:
Got the bulk air fitting coming from the forum store.

Hey there, i have a couple questions regarding the bulk air fitting that can maybe be answered in this thread.

Im wondering if i can use the fitting to fill the main tube of my qb78 with air directly with a hand pump? If so what would i need to do this safely, as in monitoring how much pressure has been pumped into the gun. Also curious if anyone knows approximately how many shots id get with the tube filled to about the same pressure as co2.... its a 177 cal gun.

Im not interested in getting more power from the gun im just looking for ways to cut my reliance on co2 and get more consistent velocities in cold weather.

Any info is appreciated :)

The fitting from the forum store I got you would have to keep the tank attached to the gun. So no you can not fill the gun with a hand pump directly. Fill a tank and leave it attached. I think this is what you are asking. Want no tank that is a PCP or a different fitting. CHEERS!


Thanks for the response, yes im looking for a way to easily and directly fill the main tube... ive definitely seen guys do it online i just cant remember how lol but thank you, ill keep looking :)


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 4:56 pm 
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Posts: 822
Location: Meaford, Ont.
Not to sure this is the gun for that. In my research before I even bought the gun their is very few that went there. Every site I went to they were no longer available or from the US that I refuse to buy from now with my shop Canada attitude till someone leaves office. CHEERS!


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 5:00 pm 
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Joined: Fri Jan 22, 2010 1:17 pm
Posts: 1755
Location: Kingston, ON
Sevensson wrote:
[

Im not interested in getting more power from the gun im just looking for ways to cut my reliance on co2 and get more consistent velocities in cold weather.

Any info is appreciated :)

I have never had consistent velocity with this method. Here is a test I did a few years ago @ .177 non-PAL no hammer mods. Target was shot indoors from a rest at 15 yards. You can see the poi drops steadily, although the first 30 shots are not too bad. Rife was tuned to be non-PAL on CO2; it shoots around 520 fps with 850 psi HPA tethered, and is very consistent using that method. YMMV.
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_________________

Duke ))))----//----------==


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 5:21 pm 
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Joined: Mon Nov 19, 2018 7:39 pm
Posts: 31
Location: Maple Ridge, BC
wheeliehd wrote:
Every site I went to they were no longer available or from the US that I refuse to buy from now with my shop Canada attitude till someone leaves office. CHEERS!

I definitely agree with your shop canafian attitude!... i might try tethering a tank to see how i like it :)


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 5:25 pm 
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Joined: Mon Nov 19, 2018 7:39 pm
Posts: 31
Location: Maple Ridge, BC
Dukemeister wrote:
Sevensson wrote:
[

Im not interested in getting more power from the gun im just looking for ways to cut my reliance on co2 and get more consistent velocities in cold weather.

Any info is appreciated :)

I have never had consistent velocity with this method. Here is a test I did a few years ago @ .177 non-PAL no hammer mods. Target was shot indoors from a rest at 15 yards. You can see the poi drops steadily, although the first 30 shots are not too bad. Rife was tuned to be non-PAL on CO2; it shoots around 520 fps with 850 psi HPA tethered, and is very consistent using that method.

That is really helpful and interesting info man, thanks a lot. Might try a tethered tank to see how i like it.


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 Post subject: Re: QB78 bulk air build
PostPosted: Sun Jan 20, 2019 5:27 pm 
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Joined: Mon Mar 27, 2017 7:06 pm
Posts: 822
Location: Meaford, Ont.
Dukemeister's numbers says it all. Then I figure I am almost there when I decide to got to full PCP. Baby Steps! :lol: CHEERS!


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