infected Posted January 26, 2012 Report Share Posted January 26, 2012 Picked up a PDI hop chamber, PDI 6.01 VSR length AEG cut barrel, VSR VC cylinder set, and PDI V trigger for a VSR10 pro sniper. Everything installed, chrono's about 580fps. Tried using various .4g bbs and the hop unit seems to barely effective. Tried with .3g bbs with the hop almost all the way on and it works okay. Anyone out there have better luck with heavier ammo and the PDI V hop? Link to post Share on other sites
J.J.Simpson Posted January 26, 2012 Report Share Posted January 26, 2012 I had PDI chamber in my L96 two years ago. Good thing. The stock chamber was terrible. If you have VSR-10 I think it was bad idea to change the hop. Everybody says great things about VSR hops. Now, about your problem. I remeber PDI selling different arms for L96 hops. Maybe this is the case here also. Maybe you got low type hands and the dont press your spacer enough? That could be the problem? Link to post Share on other sites
scar527 Posted January 26, 2012 Report Share Posted January 26, 2012 If you get longer arms this should solve the issue. It may also be incorrect installation. Have you tried .36's? Link to post Share on other sites
infected Posted January 26, 2012 Author Report Share Posted January 26, 2012 Install is correct, and the hop unit is moving the bucking properly. What I did find in the instructions is that this unit was built with a lower fps in mind (can't remember what it was). I'm running this at 580 fps. I've not yet tried .36's as the customer really wanted this gun to run .4g bbs. I've tried putting in a different brand hop rubber with similar results. To my knowledge there is not a longer hop up arm for this hop unit. It could also be that the nub is too soft? I'll play around with another nub tomorrow, and then if that doesn't work, try a different hop rubber as well. Link to post Share on other sites
J.J.Simpson Posted January 27, 2012 Report Share Posted January 27, 2012 http://www.x-fire.org/list/t96/e.t96_list.html scroll down the list. HOP UP BAR - low, high. This is for L96. I dont see them for VSR though Link to post Share on other sites
l96ninja Posted January 27, 2012 Report Share Posted January 27, 2012 Have you tried a harder nub? I cut a piece of an ink tube from a pen and used it as a nub in my PDI chamber and got TONS of hopup, much more than the stock nub gave. Link to post Share on other sites
Lightbulb Posted February 4, 2012 Report Share Posted February 4, 2012 I put biro tube as a nub on my stock vsr chamber and now I have way to much hop (until I put a stronger spring in anyway then it should be about right). Harder bucking and harder (or bigger) nub could help. Link to post Share on other sites
theosarr Posted February 9, 2012 Report Share Posted February 9, 2012 Try using a rubber band or two instead of the o-rings that came in the package... heavier rounds need more pressure on the nub and the o-rings can't provide it. If you wrap a good quality rubber band (silicon type) in the slot of your hopup chamber you will get tons of hopup and you will be able to overhop even 0.43g bbs. This is not my idea... a fellow airsofter suggested/done it but i can't remeber his nickname to give him credit. Link to post Share on other sites
infected Posted February 9, 2012 Author Report Share Posted February 9, 2012 I've tried several different hop rubbers, and different hop nubs now, to no avail. I think theosarr is on the right track. I think the bars are able to lift too easily. They should have placed the bands closer to the end of the bar farthest from the pivot point. Question is now where to get some bands that are stiffer than the o-rings supplied with it, but stretch enough to install. Link to post Share on other sites
bjorn Posted February 9, 2012 Report Share Posted February 9, 2012 I think you should consider trying different o-rings as well. They are cheap, precise, easy to install and in a wide variety. Get something more heavy dut and with less diameter. Should work as well. B. Link to post Share on other sites
theosarr Posted February 10, 2012 Report Share Posted February 10, 2012 Last night's trial and error installations showed me that the o-rings and their placement on the hopup chamber (even if you achieve the desired pressure level eventually will deform permanently) aren't the only flaws. The nub is too soft for our needs and surely as mentioned from other people you will need something stronger. Don't get me wrong... the pdi chamber is an excellent product for what it was designed to do! It was ment to be used at low velocity and mass projectiles that are widely (not only) used in Japan. To sum it up, i used two small rubber bands wrapped twice in the o-ring slots... installed a r-hop patch with a harder (solid piece of cylindrical plastic) nub and i am overall happy with what i got. I believe that any regular hopup rubber with the proper amount of pressure applied will be ok! Link to post Share on other sites
infected Posted February 13, 2012 Author Report Share Posted February 13, 2012 i swapped the nub now for a bit of nylon lead from my weed trimmer. Then I found some smaller o-rings and put them on there. After that the hop was still not enough. I then put 2 pieces of the nylon trimmer line for the weed trimmer under the o-rings above the hop bars (one for each bar), and now it is actually over-hopping. I think with a bit of adjustment this will work. If only they had put the o-rings further up the arms. Link to post Share on other sites
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