I have a few issues with my r33 gtst s1, I've had it for a couple of weeks.. All stock except for exhaust, gtr coil packs, after market fuel reg, bigger fuel pump I'm told and boost tee which is removed because I'm trying to get it running properly on stock boost... Main problem is at 4-5k rpm, it doesn't like to rev past... Only getting like 3-4 psi... Feels like surging in higher revs... Maybe fuel cut, but it's stock?? Turbo spools well, waste gate functions.. Just not sure where to start? Afm I cleaned, new plugs n oil... No apparent boost leak.. Stock ecu... Any suggestions would be helpful, thanks
