R33 boost spike issue
Hi all, I need to find a solution to fix a boost spike issue that my car has. It's a 1997 manual GTST, only mods are YJ coils, return flow FMIC, MBC and 3 inch turbo back exhaust.
Since I installed my front mount and dialled my boost up to 10/11 PSI I have noticed that when I punch it from 3.5 grand upwards the boost will spike to 12 or 13 PSI for a moment and then taper back to my set pressure. Just last night I installed a JJR bellmouth 3 inch dump pipe and now when I punch it, it will spike to 15 PSI! Would prefer not to launch my exhaust wheel out my exhaust, so I need to get this under control. Do I need an electronic boost controller or what?