Originally Posted by Terry@BMS
This is a good thought, but it flys in the face of logic on how the electronic DV's work, that are on almost every new car including these, N20's, the New M5's Eco boost motors etc. Using the electronic solenoid there is no way to apply boost pressure to it, the spring is what keeps this closed exactly like a boost operated waste gate. BUT there is also a reason we replace them if any plans in upgraded performance is needed, cause they blow open. In the forge DV's they have a spring that is rated at 20-22 PSI. Forge originally suggested this spring rate when I first told them what we were doing, since then I have spoken to them and they mentioned they might suggest going 1 step higher on the spring just to be safe.So all of the new ones I bought have a blue spring rated at 25+ plus instead of a yellow. We ran the DV system on these exactly the way the company who makes the DV's do on many cars (link below, it works well). If you can apply boost to it, it would most likely hold it shut, but finding a way to do that and have the vacuum supply open is a little tricky. Using a 4 port solenoid with boost and vacuum instead of a 3 could work. If this is the problem I think just bumping up the spring should fix it most likely. These are things you run into when testing as turbo for the first time, and is nothing out of the ordinary. Hook up a boost line to it and see what happens, and let me know.
DV kit for the Mini cooper plumbed and ran the same way as we did on the N55