Is there an advantage for using a Turbosmart 3 port over the standard Amalvalve setup?
And in what area are these aftermarket systems a significant improvement over the use of an amalvalve?
Accuracy/consistency at delivering a preset boost pressure. When I was running an Amal valve the boost used to be very inconsistent and the boost would sometimes be upto .3 bar down on what it should be. I would then change gear and it would boost fine which used to do my bloody head in! I've since removed the Amal valve and replaced it with an adjustable boost valve but that's soon to be replaced with one of the above controllers.
I've heard a lot of people saying the apexi avc-r is top dog but they're meant to be a pain in the arse to set up.