I have a GM inline 250 with a Grand National T3 turbo. It has a factory HD wastegate that is rated at a factory PSI setting of 18-19 psi. On my test runs my boost would raise past 15psi and I would have to get off the throttle. For it to be safe, I wanted to lower it to a safe 5 psi so that I do not blow it up. I started to research how to lower PSI and came up with a mod that included a compression spring that "helped" the actuator rod extend. The directions were not very clear, so I decided to make a short video to visually explain how it works.
TECH: How to lower PSI on wastegate actuator
