i want to run and hold 10psi, the problem is that if i set my controller so i have 10 it falls off to about 6 as i near redline, i thought mabey the turbo was just being overflowed, (like the stocker) but if i unhook the wastegate hose, and feather the throttle to control the boost i can get easily 15psi at 8000rpm

the turbo is a s5 hybrid, t5/6 compressor, and mega wastegate porting with almost too much backcutting. the trubo was assembled/rebuilt by me

i thought that mabey my problem was that i only had a bleed type controller, so i bought a ball spring/bleed type......still does the same thing

what is causing this??????? someone please help me
zac

 

Try an electronic boost controller.

-Max