Bringing this post back from the dead as it was the best I could find on the operation of the amalvalve.
Am I correct in thinking that the bleed through the R determines how high the boost can be. But the boost doesn't necessarily go that that value, as the chip will determine at what pressure the amalvalve will close the R port?
So for instance if the restrictor in R is quite small, the boost might not be able to go above 1.2 bar, even though the chip is good for 2.0 bar. On the other hand if the restrictor has a bigger hole (or is even missing), the boost might go to 2.5 bar, but the chip will limit it to 2.0 bar (if that is the maximum for that chip)?
Or should you match the restrictor in the R port so that the maximum boost possible by the amalvalve matches the maximum boost allowed by the chip to prevent it doesn't boost too high?