I forgot to install the stiffer flow control device spring on my new to me r58.
After installing it, I noticed that I had to grind much coarser for the same beans I’d calibrated.
I mark grind settings on each bag of bean.
I dial a bean to start dripping between 6 and 9 seconds.
With the differ spring, first drip started at 12 to 15 seconds.
What I deduce is that the softer stock spring was allowing for some preinfusion.
How does one trigger preinfusion on a stock e61?
How does it work?
How does a stiffer spring eliminate it?