OK, so I'm basically thinking out loud here please let me know if my logic is valid or not.

Before I polished my internals I was chronoing at 250fps w/ the velocity screw buried. I was able to run the tank down to 250 to 300 psi when the cyclone stopped feeding. The balls were just lobbing out of the barrel, probably wouldn't break from a 10' shot.

After polishing my internals I still have the velocity screw buried and now its chrono'd around 280 fps. I plan on getting a spring kit.

Now the thinking out loud part.

The drive spring is supposed to open the valve that allows the compressed air to push the ball out of the barrel as well as drive the cyclone. So to get the most efficiency out of the tank, you'll want the valve to be open as little as possible and the velocity screw out as far as possible.

But at some point you'll starve the cyclone. If there is not enough excess air to drive the cyclone good efficiency won't matter.

So theoretically, you'd want to set up the drive spring to provide proper velocity (280fps or whatever the field allows). And you want the cyclone to operate as deep into the tank as you still can effectively shoot. So, if you consider 200 fps the lowest "playable" velocity (if you get close enough, the ball will still break) you'll want the cyclone to still feed.

So you chose the drive spring that will allow a good balance that will still feed the cyclone and still allow enough velocity to break a ball when you're down to 500 psi or so.

ummmm, Right?

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See, the more you screw in the FVA, the more backpressure you have in the system. Meaning, the longer you can operate your cyclone.

On a stock A5 without Regulator or RVA, "Gas efficiency" is a load of tripe. Each shot holds the valve open for the same amount of time regardless of your FVA settings.

If you want to be able to shoot and cycle effectively for the longest, I suppose what you would do is turn the FVA quite a ways in, and then use a strong drive spring. The catch is that this will eat a lot of air.

...Damn it, I confuse myself.

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