Re: Do you know when your supercharger runs?...ALWAYS
Turbos like my old super sixty have wastegates to limit boost typically for detenation.
Some superchargers have bypass valves but most don't like the old 6-71 GMC blower.
It is totally possible for the supercharger to be running even at 70 in a partial vacuum, because you are making enough power to satisfy the needs at that road speed / load. Open the T/B more and the air density will increase until the pressure goes atmopheric and then into the boost region as more power is desired.
Please check at the driveway to see that the S/C kicks in when torquen the transmission, like 1500 rpm. Also meter the clutch to see for your self. Note the power is positive on the brown wire and negative on the other, reversed from the I/C pump motor color code. You have to measure differentially across BOTH leads, not from chassis to one lead or the other.
Wee this is going to be interesting as more add in on this topic. Where's Splinter???
Hot damn, Woody