Here's another interesting test and observations, however irrelevant
I tested my Synchronika with a blind basket. To do the test, first I flushed a couple of times to purge the air from the portafilter.
With the flow control closed, it took 12 to 17 seconds for the brew pressure gauge to reach 9-bar.
With the flow control at 90-degrees open, it took 6-seconds.
With the flow control half open it took 5-seconds.
With the flow control 3/4 open it took 3 seconds.
With the flow control 1-turn open it took 4-5 seconds.
With the flow control 1-1/2 turn open it took 2 seconds.
(fully open on mine is 1-3/4 turn, which I did not test.
This was kind of what I expected to see. Again, I don't know what use to make of this information...I'm just messing around, trying to understand the thing.
Now for the interesting bit, which I simply don't understand. At closed, 90-degrees and 1-turn, The brew pressure continued to creep up past 9-bar, stopping at 12.4 bar
. On the other settings it did not rise beyond 9-bar (which is what my pump is set to). What gives?