the next mod will be to control the pump speed during extraction, to allow for pre-infusion at 9 bar and lower pressure extraction in the back half of the pour
around 5-6 bar just enough to keep the small trickle coming. The result is trying to copy what a good lever machine does.
quote-
I still get flow at the very slowest setting even though you can barely hear the pump (very quiet). And the pressure is variable from about 1 bar to 9 bars (where the OPV is currently set). And it is very smooth (even though in the video my gauge is jumping all around - I think I had air in there).
I have been getting the best espresso I've ever had - very different from what I was getting before. And it has really widened the range of coffees I can use for espresso. I'm now doing some lighter roasts that would be way too bright if pulled at 9 bars. When I start out at 9 (just bring it up to 9 bars long enough to get the pour started) and then back down to 4-5 bars to keep the pour barely trickling, I get much more creaminess and rich deeper tones in the cup and much less of the citrus peel.
around 5-6 bar just enough to keep the small trickle coming. The result is trying to copy what a good lever machine does.
quote-
I still get flow at the very slowest setting even though you can barely hear the pump (very quiet). And the pressure is variable from about 1 bar to 9 bars (where the OPV is currently set). And it is very smooth (even though in the video my gauge is jumping all around - I think I had air in there).
I have been getting the best espresso I've ever had - very different from what I was getting before. And it has really widened the range of coffees I can use for espresso. I'm now doing some lighter roasts that would be way too bright if pulled at 9 bars. When I start out at 9 (just bring it up to 9 bars long enough to get the pour started) and then back down to 4-5 bars to keep the pour barely trickling, I get much more creaminess and rich deeper tones in the cup and much less of the citrus peel.

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