Power Valve Selection: The Definitive Answer

Keep us posted on your results. If you are dats logging the results it would be nice if you could post the logs. Graphically it's easier to see.

I've played with dual stage PV's way back in the day. Never got much with them, as they are flow limited. I also made up a tool to actually test PV opening. I even started changing springs to increase the opening time. I found if you can get the PV to open at about 60% of cruise vacuum you had it by the short hairs.