Re: Matador Reg kit to get .25 34gr JSBs up to speed
The EDgun regulator is one of the best in the world. It is straightforward and efficient. The regulator is capable of almost 1 FPS extreme spread. Wingman did an excellent video where he showed that variation is caused by external factors, not the regulator. So the Huma advantage comes from its low profile, this gives more volume in the plenum. I would put it on par with the Edgun regulator regarding efficiency
In the standard, the speed I can achieve realistically is 790 to 810 with the Huma and 34s. The long will hit about 830 max. I don’t like the current set up, and I would like to run the regulator at 120 and get speeds of 880 in the long with 34s. I have some ideas how to do it, and Wingman is going to help.
So be patient I am working on a solution to get more speed and not redline the capability of the Matador
All Replies
Hagantool@aol.con
Do I also need to open up the breech TP to 5.5mm?
Yes, if your measurements are correct it will make a difference. You can call John Hagan to have the regulator drilled. I had one reg body fixed by John
Hagantool@aol.con
.22 = 5.2 mm
.25 = 5.8 mm
Valve seat:
22 = 5.5 mm
25 = 6.5mm
Forward breech TP:
22 = 5 mm
25 = 5.5mm
Something is off in your gun. All the hammer weights have been CNC, so they weigh the same
Do you think that little difference in TP size is the reason? I made the measurements with a digital gauge FYI.
Valve TP:
.22 = 5.2 mm
.25 = 5.8 mm
Valve seat:
22 = 5.5 mm
25 = 6.5mm
Forward breech TP:
22 = 5.1mm
25 = 5.8mm
Something is off in your gun. All the hammer weights have been CNC, so they weigh the same
It looks like you are using a pretty low BC at .033, at least compared to other reports I’ve seen for the .25 heavies. The reports I’ve seen have been more in the .05-.055 range (but lower for ST barrels). My guess is that your speed is actually a bit lower. The first time I tried to do a chrony session with the new kit, I had bad lighting and was getting mostly errors but the readings I did get were 920s to 930s. I did a session this morning with good light with no errors and got an average of 892. But I haven’t tried to actually calculate a BC yet, so I could be wrong.
My transfer port on air tube side is 5.6mm and transfer port on breech side is 5.3mm.
I got my HST from EdgunWest.
Do you have a stock or aftermarket HST? Measure the length of valve rod you have protruding from the rod bushing.
My chronograph is terrible and may be off… I did get 3 readings. The trajectory definitely follows the chairgun reticle though.
I am blown away with the results.
Joe
Can you measure your TP sizes for me?
I installed the kit in my .25 long and got just a little time to check it out. With no tuning, just installing the new plenum kit and leaving the hammer spring exactly as it was gave me 892fps avg, SD of 5. The ES was higher than ideal at 19, but I’m pretty sure I could get more fps and lower ES with some tuning if I ever get time to do that. Regulator is set at ~130bar. Pellets impacted higher and to the right than previously, which I guess makes sense with a higher speed and a right hand twist.
I switched out the hammer spring with a new one and am still only able to reach 890 fps with 34gr Kings and the reg set at 140bar. Perhaps this has something to do with the gun’s production year? I bought my .25 R3M std back in 2014. Or maybe variance in the brass hammer weight?
I have been out of town on business all week. My 34s arrived while I was out. Just finished a tuning and shooting session with the .25 R3M STD with the power plenum kit.
Deleted erroneous information so as to not confuse or mislead anyone.
Joe
For the folks who have already installed one of these kits, where did you end up with you hammer spring? Was it tighter/looser/about the same as your setting w/o the larger plenum?
That hammer spring manners, imagine you cut four coils off the spring. I have done this for the UK market. I have found these slight variations manner on the gun. It is all about dwell time and the amount of force required to obtain the valve dwell time.
The short requires more reg pressure 140 to 145, this will sling the 34s at about 885 in the short
What have you achieved in a shorty?
- You must be logged in to reply to this topic.
Hagantool@aol.con
Isn’t 890 fps the speed a standard can achieve max?