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Old 06-15-2009, 02:49 AM #1
arad99
 
 
Join Date: Jun 2009
Trracer velocity problems

I'm pretty new to pump play, bought a PMI Trracer, changed Orings, springs, lubed and played. but I accounter a strange problem.

the velocity ist too much inconsistent. I chrono one day, shooting 260 fps, which I like. the end of the day schooting just 140 fps, way too slow. another day again at 260, some days I just can't get over 140, no matter what I do.

I'm running on HPA, so I don't expect these things.

can anyone help?
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Old 06-15-2009, 06:20 AM #2
jk_6109
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Hmm, i dont know what would do that... I know that this is a dumb questions, but are you refilling your tank? To me, this sounds like some sort of tank problem or something.
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Old 06-15-2009, 08:18 AM #3
arad99
 
 
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I try 2 different HPA tanks and a 12g CO2... same with both, the tanks are well on other markers, so I don't believe in any error in them... but anyways, have to check...
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Old 06-15-2009, 12:22 PM #4
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See if you have much air in your tank when it won't shoot very high velocity. You might want to try another tank like others have said.
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Old 06-15-2009, 12:31 PM #5
KURTCOBAIN (Banned)
 
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sounds like a springing issue to me
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Old 06-15-2009, 01:50 PM #6
flyingmachine
 
 
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could possibly be a roll out issue. The stock barrel is huge, easily causing roll outs. After putting a few strips of tape at the chamber end of the barrel, my consistency issue went away. I'm also on the stock springs and running HPA
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Old 06-15-2009, 06:36 PM #7
FuzionF88
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Heres what I run and im in the 280's for a few shots then in the 250's.
Stock spring, 12g, a single 1-inch long pice of electrical tape parrallel with the barrel at the breach end. Use hpa if you want consistancy and not having to change air sources much, run 12g's if u want a light setup. Depending on the output of your hpa tank (low pressure = around 450 psi out, high prssure = around 850 psi out). Since the Traccer is unregged, the psi that you run through the gun will fluctuate the velocity. Low pressure = lower velocity, High pressure = higher velocity.
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Old 06-16-2009, 02:28 AM #8
arad99
 
 
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good point with the roll out, that didn't came to my mind. there was some old tape in the barrel, but I had to remove it (real old) and I didn't replace... I use some big balls, they dont roll all the barrel down, but if they roll half the barrel? I have to try...

THANKS
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Old 06-16-2009, 07:44 AM #9
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If they rolled part way down the barrel before firing, that would probably effect the velocity. Not as much time for the ball to accelerate?
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Old 06-16-2009, 01:24 PM #10
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Yeah, not enough time to accelerate, but the gap between the bolt and ball is much bigger, requiring much more air to fill the gap and propell the ball out the barrel. When the ball is touching or almost toughing the bolt face, the explosion of air has much more energy, and fills a much smaller gap, much faster.
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Old 06-17-2009, 12:36 AM #11
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There isn't really much you can do to a Trracer, it is as simple as it can get. When I got my gun, I upgraded the spring and my gun came with the velocity adjustable bolt. You might want look for a Nelson Spring Kit. If you cannot find that, go with the autococker springs, I heard they also work (someone please confirm this). Check if your bolt is adjustable. If it is, you can stick an allen wrench down the middle and turn it up or down.
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Old 06-17-2009, 12:40 AM #12
washington (Banned)
 
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remove the valve spring, just screw the tank in fast
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