High rpm boost falling away
Hi guys,
Running a rb30det (neo). 270 cams, good inlet and exhaust manifold etc etc. gt35 with .82 rear. Aquamist wmi.
Have always ran an internal gate and had boost control issues with it spiking but then falling away..
Changed to 50mm external gate and its better. But boost still falls away at about 5000rpm from 30 to 25psi ( trying to run 30psi)
Gate is plumbed into exhaust and exhaust is 3inch, one muffler no cat.
The car made 545hp on that boost through an auto (Hub dyno)
Just looking for some ideas, does the gate need to be vented or am I possibly out of turbo/rear housing