K I'm having issues with my external wastegate. Figured, best way for me to figure out what it could be is by first understanding how this thing works. I have an older Trust/Greddy External wastegate.
Has 2 nipples on it, I know the side is the vacuum port and the top is the line for the controller.
I just dont understand how a boost controller regulates the boost via the top port. Doesnt boost controllers control boost by restricting the amount of air going thru it?
So lets say you have your boost controller to 18 psi but you have a 14 psi spring. Once you hit 14 psi, the boost controller shouldnt be letting air thru till 18 psi. So if there's no pressure on the line after the boost controller and the spring is already seeing 14 psi, how is it keeping the spring from opening?
My issue is that I was boosting 1.2-1.4 bar with the boost controller off. Some times it would overboost to 1.6. I was told to open the wastegate up and make sure nothing is binding. I opened it and cleaned it up. Slapped it all back together, didnt touch the adjustment screw up top and now I'm only hitting .7.
