I've got a 2000 GSR with a Hondata, T3/t04e, Tubular mani, tial gate, and Blitz sbc-id controller.
For some reason I can't co over 4.5 psi when I'm lucky. Usualy it's 2.5 - 4. I made sure my boost controler settings were right, 2 shops checked it's install as well. I thought it might be me BOV opening under boost as it seemed to on the dyno so I tightened it almost all the way and no change, although it dodn't make the valve any quieter. I turned my boost controller to internal WG mode and it went up to 5.5psi once but slowly, any ideas? The car Is tuned for 8.5psi and I want to run it!

 

check your piping again. sounds like your leaking boost. it happend to my friend. couldn't get past 4psi. and had the boost turned up to 10 psi. found the leak, replace the pipe. running great!