I've used MAC three port valves for years now, and they deliver. Most boosted engines I have done are between 1,5bar to 3,0bar of boost and I think many engines here in this forum fall in this category. In the past I was disappointed on Pierburg valves and essentially forgot them for good.Mark_r33 wrote:...use them almost exclusively now...
I plumb the valve so that more duty more boost, and if valve is electrically disconnected then only spring level boost. And easy to do a simple high/low-boost switch, just cut either wire via switch.