What do you mean by rotor phasing? At low RPM your giving a cleaner signal in to the box as discussed earlier; off that falling voltage. So I imagine it did clean up your idle. That is what the box wanted. You had to reposition the distributor to get the correct timing for the back side of the reluctor tip.
Position of rotor to term. in cap at time of spark. Was thinking changing trigger point would move this.
These replaced MSD's. I wonder if MSD is a rising edge set up? Because just changing the box leaving all else the same it would only run on rising edge.
