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ThunderCactus · July 3rd, 2013, 18:45

Remember, increasing pressure doesn't JUST increase pressure, it also inherently increases the amount of air being used, which translates to a higher uncompressed volume.

So since you're in the testing mood lol
What happens if you keep it at 115PSI with the long barrel and decrease the DP?

Just like a GBBR, the longer barrel allows more acceleration time for the BB, but that's because there's more volume being released behind it than is required. My point here is that you may be using the right pressure, but too much volume on the shorter barrel. Wasting gas.

So like in an AEG where you're working with a fixed volume and fixed pressure, if you move to a longer barrel you don't increase pressure, just the volume (by changing cylinder ports), and you gain some fps just by having longer acceleration times. You should be able to maintain the same pressure and just increase the air volume to maintain the same fps from short to long barrel.

So I guess tune the short barrel to 1.3J, and lower your DP until you get the fps difference between both barrels to around 30fps, and that should get you close to the minimum volume requirement for the short barrel. Assuming the DP can even close that fast...
You're not relying on springs, air temperature, blowback weights, blowback spring strength, chamber temperature and bypass valves to regulate the amount of gas you're using like a GBBR, you're able to control the air pressure and air volume just like an AEG, so you should be able to get it to mimic the performance profile of an AEG. At least when it comes to swapping barrels.

I'm certainly not saying you're tuning it wrong, just that it's not optimized to use the minimum amount of air

EDIT; our local guy's using .28g BBBs, 45PSI & 12DP on a 455mm 6.03 prometheus and that's real close to 1.6J (420 on .20s) AND doing 1500rpm But that's on a silver nozzle.
Sooooooo you might wanna switch to silver? lol
The smaller nozzle just chokes the air volume getting into the barrel, which actually makes it less efficient. As I understand it, the smaller nozzle allows you to get ridiculous ROF, buuuuuuut 45PSI and 1500rpm is a pretty strong argument for the silver nozzle...

July 3rd, 2013, 18:45	#61
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	Remember, increasing pressure doesn't JUST increase pressure, it also inherently increases the amount of air being used, which translates to a higher uncompressed volume. So since you're in the testing mood lol What happens if you keep it at 115PSI with the long barrel and decrease the DP? Just like a GBBR, the longer barrel allows more acceleration time for the BB, but that's because there's more volume being released behind it than is required. My point here is that you may be using the right pressure, but too much volume on the shorter barrel. Wasting gas. So like in an AEG where you're working with a fixed volume and fixed pressure, if you move to a longer barrel you don't increase pressure, just the volume (by changing cylinder ports), and you gain some fps just by having longer acceleration times. You should be able to maintain the same pressure and just increase the air volume to maintain the same fps from short to long barrel. So I guess tune the short barrel to 1.3J, and lower your DP until you get the fps difference between both barrels to around 30fps, and that should get you close to the minimum volume requirement for the short barrel. Assuming the DP can even close that fast... You're not relying on springs, air temperature, blowback weights, blowback spring strength, chamber temperature and bypass valves to regulate the amount of gas you're using like a GBBR, you're able to control the air pressure and air volume just like an AEG, so you should be able to get it to mimic the performance profile of an AEG. At least when it comes to swapping barrels. I'm certainly not saying you're tuning it wrong, just that it's not optimized to use the minimum amount of air EDIT; our local guy's using .28g BBBs, 45PSI & 12DP on a 455mm 6.03 prometheus and that's real close to 1.6J (420 on .20s) AND doing 1500rpm But that's on a silver nozzle. Sooooooo you might wanna switch to silver? lol The smaller nozzle just chokes the air volume getting into the barrel, which actually makes it less efficient. As I understand it, the smaller nozzle allows you to get ridiculous ROF, buuuuuuut 45PSI and 1500rpm is a pretty strong argument for the silver nozzle... Last edited by ThunderCactus; July 3rd, 2013 at 19:12..