Hi guys, can anyone please tell me at what bar the drs comes regulated at. Thinking of tuning it myself, what's your suggestion on setting the regulator pressure and the hammer strength?
Thank you.
Thank you.
I did my drs t without reg gauge, just upping reg and hammer until fully open valve would give me the speed I want plus some and then dialed the hammer back to go 3-4% below vMax. No idea where the reg is sitting right now (but seems like I am falling off at around 100-105b (.22 600mm). Here’s the result (18gr AEA):If you plan on re-tuning your DRS you will need to put a gauge on your plenum.
This is the only way to accurately set your regulator pressure.
As far as hammer spring tension, that will be determined by the regulator pressure, projectile weight and the speed you want that projectile.
You’ll need a chrony to tune it properly but one thing I can tell you without: full hammer spring at 90b is waaaaaay too much hammer, you’re waisting air and are over hitting your valve. You have to dial the hammer way back.Thank you guys,
Gun is a 4.5 cal. I have tuned the regulator to 90, and the hammer at full tension. Since I don't have a chrono can't tell at what fps it's shooting. Pretty accurate with 11 grain at 20 meters from 150 bar and downwards. However, the air consumption is not very efficient and count is about 30-40 shots before it reaches the regulated bar.
I’d be surprised if the stock hammer is valve locked beyond 120b given what some people do to their DRS… I’d up the reg beyond 120b and try with less hammer to hopefully reduce dwell and increase efficiency. Sounds odd but may do the trick and give you a shorter but stronger burst of air.Same on my friends 700 mm DRS, it too ( 120 BAR ) need near full hammer to push a 13 gr slug to 970 fps, the second i go back on the hammer speed drop, and if i lover reg pressure to say 100, well no matter the amount of hammer i can not get up to 970fps
i have heard from Huma today and they will be making a dual transfer port for the 4.5 mm DRS, and i think that is very much needed.
But yes it do sound like my friends DRS is wasting air, but i cant seem to adjust around that and get the speeds i want.
A heavier hammer might also be warranted here.
Again in .177 / 4.5 mm i feel these rifles are just a after thought of brands.
150 bar is a lot of pressure for 10 grain pellets or slugs for that matter, that is the pressure i shoot 24 grain slugs in my 700 mm Two and knocking on 1000 FPS
The 4.5 mm DRS for damn sure have some issues.
Same on my friends 700 mm DRS, it too ( 120 BAR ) need near full hammer to push a 13 gr slug to 970 fps, the second i go back on the hammer speed drop, and if i lover reg pressure to say 100, well no matter the amount of hammer i can not get up to 970fps
i have heard from Huma today and they will be making a dual transfer port for the 4.5 mm DRS, and i think that is very much needed.
But yes it do sound like my friends DRS is wasting air, but i cant seem to adjust around that and get the speeds i want.
A heavier hammer might also be warranted here.
Again in .177 / 4.5 mm i feel these rifles are just a after thought of brands.
150 bar is a lot of pressure for 10 grain pellets or slugs for that matter, that is the pressure i shoot 24 grain slugs in my 700 mm Two and knocking on 1000 FPS
The 4.5 mm DRS for damn sure have some issues.