15+ Year Contributor
- Dec 25, 2005
So I just completed my N/T to turbo conversion and took the car for a ride. It drives smooth and pulls hard. Now here's the thing, max boost is 12psi and all the way up to 12psi is smooth and feels great but as soon as it hits 12 psi, it will stay there like it should. However, it only stays there for about 3 seconds and then watching the boost gauge it jumps down to 9 and will climb back up to 12psi again and do the same thing unless I let off throttle or shift. What could be causing it to do this?