Quote: PaintBallin27: "ScoreShot, what your setup? and what are your readings over the chrono with it? mines at +-3fps with a HPA tank and a pps stab with the stock drive spring in."

OK 27 here's my specs and latest velocity consistency test results:
A5, Polished internals and Hammer, NDZ Power tube /Bolt,(although for this test I used the JCS PT/Bolt without FVA and Cyclone/RT ports as I wanted to eliminate any factors which may influence the test results relative to Springs and Pressures.)Palmer male stab, Pure Energy 68/3000 on CP on/off ASA-no remote. SP Freak.

700psi - Stock main spring- RVA as far out as possible-very lite.

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+/- 8fps

500psi-Stock main spring- RVA all the way in, much stiffer.

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+/- 12fps


I wanted to tell you last night but your readings of +/- 3fps are in my opinion excellent, especially for an A5. +/- 8fps is the best I have been able to do so far. In any event, on my setup, more pressure and less spring is what works for me. But as I stated in an earlier post, I'm not convinced either approach is any more air efficient than the other. It takes the same amount of the energy stored in the tank to shoot at a given velocity, regardless of how you feed it to the ball. The only way to get better air efficiency is to make the marker to require less energy to do the same amount of work-FPS.
That being said, I have no experience with an LP setup. Are they really supposed to be more air efficient as in more shots per tank?
Just wondering...might have to get my hands on one to check it out.LOL

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Courage can exist only together with your fear.

How do you figure that you're using the same air per shot at 700psi as you are at 500psi?

Also, 500psi is excellent without a volumizer.

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A-5, APE 2.0 board and E-grip, Rhythm Innovations Mag trigger, TechT Squishy Paddles, TechT Vortex Mod, TechT QEPH, TechT Lightening Rod, GTA LPK, PPS Fatty Stab, JCS Gold Power Tube, MadDog Spring Kit, PPS 12" Single Vent Brass Barrel, PPS Apex Adapter, BT Apex, Hogs Den Rubber Grip

i took apart my gun today and i noticed i had the lightest spring in, not the stock. that means my +-3fps readings was from the softest spring. ill tell you my exact setup (things that will affect consistency). i had the following:

Alpha black
~lightest drive spring from my BT spring kit
~DOP pro-seal (the FVA screw was grinded down to half the length an loctite'd to the point where the airflow is not blocked. the screw was flush with the inside. oh, i also brillo'd the frontof the powertube and polished it with brasso)
~superfly front bolt
~PPS stab set to 850psi
~88/4500 crossfire set to 850psi
~polished internals and rear bolt

i think thats it.

you think that a hard spring at a lower psi, with a volumizer, would be more consistent then a soft spring at a high pressure without a volumizer? what about a soft spring at a high pressure with a volumizer?

OK so your numbers are with the high pressure /lite spring setup simular to mine but a bit more extreme. That's great! Have you ever tried it the other way? Lower pressure / heavy spring? Would be interesting if it would also give similar results to mine with low pressure / soft spring. That is, not quite as consistent.

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Courage can exist only together with your fear.

i have tried a harder spring on my 98c with pretty much the same setup and i got about +-10 through 15. i haven't really paid attention when chronoing it but those numbers seem right.

i didn't really get what you meant when you said "Would be interesting if it would also give similar results to mine with low pressure / soft spring. That is, not quite as consistent."

The simple answer is that the velocity's were very similar with both approaches and the same energy is required to achieve the same velocity. Either approach delivered approximately the same velocities. (Check the numbers)
Because 700psi with a lite spring ( higher pressure-less volume) produces approximately the same amount of energy as does 500psi with a heavy spring ( lower pressure-more volume). More volume in the same space (the power tube) increases the pressure within that space. That is why more air volume @500psi produced approximately the same fps. My tests just seem to show that greater pressure/less volume(lite spring) delivers a more consistent level of energy shot to shot.

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Courage can exist only together with your fear.

thats because it doesn't always have all the air needed to shoot. a lp chamber, or volumizer, will help this. but my question is: would it help enough to make it more consistent at a lower pressure then a light spring @ a higher pressure? no here has tried a lpk?

OPPS! Sorry 27. I ment to say "low pressure /hard spring". Meaning my setup with low pressure /hard spring was not as consistent as high pressure /lite spring.

Now that I have read your post I see that your results are in fact similar in that a heavy spring was not as consistent shot to shot as a lite spring setup.

My head is startin' to hurt...LOL,LOL I think I need a drink..LOL

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Courage can exist only together with your fear.

Good question. Let me fix up my drink while we think about it. LOL

__________________
Courage can exist only together with your fear.