I'm new to this forum, but a long time devoted TDI fan. I have a 01 Jetta TDI with a VNT-17 turbo. I worked great for some time with all my mods, but now I am having over boosting issue. It over boosts easily between 1800 and 2500 RPMs with minimal throttle. Causing severe surge. I put a guage on the actuator and it begins to move with less than 1/2 of mercury. I read that it should move till at least 3-1/2. Does anyone know if that is causing my over boosting issues? It is just that my actuator is bad and needs to be replaced? the actuator does hold under vacume showing no signs of leaks. If anyone could give me there imput I would greatly appreciate it