from a spring kit.

would there be a difference in velocity consistency between using the softest one and the stiffest one? i think this because the valve will be open for a less time with a soft spring at higher psi? or the stiff spring will have the valve opened longer at a lower psi, kind of like a LPK but not as much. a lpk helps in consistency so would a stiff spring help? if i have a softer spring, i will have to set my regs PSI output higher. would that make my gun less air efficient? if i have a stiffer spring, would that make my gun more air efficient? im guessing the stiffer spring would because it would do the same as a lpk but to a smaller extent. would a stiffer spring add more recoil? and would a stiffer spring still allow my gun to fire 30bps if my board is set to it? i ask this because the harder the spring, the slower the gun can cycle.

note: i have a PPS reg to set the output psi up to 900psi. btw, my loader can consistency feed 30bps.

I'm not sure any spring will give you the ability to reliably fire at 30bps. Your cyclone may be able to cycle that fast, but your gun may not be able to keep up. There are other OG'ers who have maxxed out their guns at 26bps, but it's not consistant.

Read through a few of the posts about high ROF (rates of fire) and you'll see what i'm talking about.

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Technically an A5 is capable of pulling 40bps. If you use an egrip sear with a mechanical trigger, that's roughly the ROF you hear when it goes full auto.

That's not to say you could do anything useful at this ROF...Chops please?

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To address your first question regarding velocity consistency relative to the spring used, the recent FPS Consistency tests that I have performed shows that in general, a lighter spring with greater air pressure produces the best shot to shot velocity consistency. As far as efficiency goes, that is another question all together and can be debated as far as which approach is most efficient: Higher psi going into the valve with a soft spring or... lower pressure going in with a harder spring. Depends on what you believe about exactly HOW a stiffer spring increases velocity.

First, we just need to realize that a specific amount of pressure(energy) inside the power tube is required to propel the paint ball at let's say 280fps. I am not convinced that either approach to achieving that pressure offers any advantage over the other as far as efficient use of the energy stored in the air tank is concerned.

I believe the general consensus of opinion is that a stiffer spring holds the valve open longer and therefore allows a greater volume of air flow to the power tube and cyclone. Greater air volume in the same space, (the power tube) equals higher pressure(more energy) to the ball. Also, a stiffer spring causes the front bolt to strike the ball at a faster rate, hitting the ball harder and consequently having a very positive and measurable influence on the exit velocity of the ball. In fact, sometimes too hard resulting in a break. (If your going the lower pressure -stiffer spring route, the use of a thicker shell paint is a good idea.) That is one way to obtain the specific amount of pressure (energy) needed to get our 280fps.

The other way is of course to start out with higher pressure going into the valve so that less volume (from a softer spring) is required in the power tube to obtain that same internal pressure or energy necessary to achieve our 280fps.

My point is simply that it requires the same ENERGY to achieve our hypothetical goal of 280fps regardless of HOW we transfer that energy from the supply to the ball. The marker becomes more efficient only when it requires less specific energy to do the same amount of work (FPS)

So why does a high pressure -soft spring setup yeild a more consistent shot to shot velocity you ask? I have a theory on that but it's 1:26 AM and time for my nap. LOL

Hope the above helps
Best regards
Scoreshot

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Courage can exist only together with your fear.

I put the stiffest spring from my kit in my marker and averaged a 20fps increase. This let me lower the psi of stab a little.

Tomorrow/today I'll put the lightest spring in the kit in and chrono it.

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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 think many of us have done the same thing at one time or another. I used to use 550 psi to the marker with a a stiff drive spring and rva. However, I have found that my shot to shot consistency is best with about 700 psi and the stock spring with rva backed out quite a bit. Higher pressure-less volume. That's how I'm setup right now. Works best for me.

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Courage can exist only together with your fear.

Some good info in this thread, Thanks for feeding the brain!

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scoreshot, can you tell me why you think that the lighter spring would give you best shot to shot consistancy?
i was thinking that if i put the stiffest spring in and make a custom LP chamber, it would be more consistent. i think this because i heard somewhere that if the reg is set to a lower pressure, it will be more consistent. what do you think?

Show me a video of 40bps then ill believe it. Even with chops id be impressed just to see it. Not saying your lying its just hard to believe.

there are no boards yet that are capable of tripping the sear 40 times a second. there are also no hoppers that can handle feeding 40bps. a tippmann can fire paint at 30bps with some heavy modding on the cyclone and a good board like a WAS or APE.

i think he meant 40CPS. a tippmann marker is capable of CYCLING well over 40 times a second.

once paintball companies make a hopper that can feed 40bps and a board that can trip the sear 40 times a second, a tippmann can fire at that speed. IMO, i don't think they will make those since it is pointless to shoot that fast.