This is defiantly the easiest and fastest mod that I have ever made for my Silvia. But never the less, I think it might be the most essential so far.
For a while now, I have had some suspicions about my OPV being set wrong (factory setting). My shots wiggled a bit too early and blonded too fast sometimes as well.
Adjusting the OPV is no problem, simply follow this video.
But if you like me don’t have the pressure gage in store, here is a method that can be used. I found it on Home-barista.
Use the video above, to know the inside of the machine.
Measure the flow in the return line using a pyrex cup while pumping with a blind filter. With a stop watch, time how long it takes to go from the 2 oz mark to the 6 oz mark or 4 oz to 8 oz etc, etc. You\'ll come up with 4 ounces in \"X\" seconds. \"X\" should be between 27 and 28 seconds.
Very simple and accurate. If you get 6 oz in less than 28 seconds, turn the OPV clockwise to tighten the spring inside, decreasing the water flow. If you get less than 6 oz in 28 seconds do it the opposite way.
Keep adjusting till you have the seconds right.
My experience is a better flowing shot, with no blonding or wiggling. You would properly have to adjust your grinder a bit to the new flow.
Highly recommendable to spend 20 minutes, to check if it’s all set correct.