Okay, so I've extensively upgraded my JG AUG for a high ROF setup, and have encountered a serious problem in result. First off, here's the parts:
Systema High Speed Gear Set
JBU Version 3 Metal Spring Guide
Systema Silent Cylinder and Piston Head Set
Prometheus Hard Piston (Already broke G&P White Polycarb)
Matrix Turbo Motor
New Cylinder with larger air intake hole (long oval rather than small square)
11.1v Li-Po Battery (Discharges at 35 amps continuous!)
I also have a Gaurder Silicone Hopup bucking. Everything else is stock.
Now the problem is that although the gun shoots perfectly for the first few shots on full auto, say 3 to 4, it rapidly declines afterwards and the BBs begin to spit out of the barrel. By this I mean they fall at 20 feet, instead of 40 yards. It starts out solid, but the BBs just start falling shorter and shorter, and with the ROF I'm getting it only take a half second at most for the range to be reduced to less than 10 yards. I can fire quick successive bursts of 3 to 4 shots each (which is basically a split-second pull of the trigger) and get near if not at full power and range on the bursts.
On single shot (which has been inconsistent since I bought the gun) the gun fires great. It gets full power and range and has excellent accuracy.
Compression is good, and I doubt it's a hopup issue because it works fine on single shot.
So what I need help with is finding out what's causing the huge drop in distance.
I can think of several possibilities, but this is my first ROF setup so I really have no clue what's causing the problems.
Extreme ROF causes slight movement of the gearbox which cause the air nozzle to lose its seal with the hopup and therefore lose compression.
The gun is firing so quickly that the piston is pulling back on the bb with immense force (due to gears pulling it back so quickly and air being forced in from the barrel, creating a vaccum behind the bb)
Gun is firing too quickly for air to be drawn in between shots, creating a near-vaccum in the cylinder and causing the bbs to be fired with minimal air pressure.
Any seem possible, though I feel like the second is the most probable. Does anyone with more experience on these setups have any idea what's going on?
I'm gonna keep running different tests and trials, starting with using a 9.6v and 8.4v to reduce the ROF and see if that has any effect. If so I'll have to figure out why the higher ROF is causing this reduction in power.