no wrong.. you need to understand the mechanics of how it works and you will realise this is just because its a boost conrol issue. and nothing more.
wasnt aware that a "gtrs bolt on" evan had an option for a external waste gate
no wrong again.. dude learn how shit works THEN make a input on the issue.
this ones free a bov has a spring yes? it has one chamber with said spring pushing the valve closed with the engine not running.....
it has a chamber with a diaphram generaly twice the surface area of the valve its self..that is conected to the inlet manifold via a hose.. soooo that when the engine is running the chamber has manifold vacume acting on it..
and when its on boost it has boost acting on it.
so whatever your engine is doing the bov has either boost or vacume controling it. now.. when an engine is on boost, it has BOOST and THE SPRING keeping the valve shut.
ie: regardless of what boost you have the bov has BOOST and THE SPRING acting on the valve.... generaly at a 2/1 ratio. so with 10 psi on the valve diaphram it will require 20 pound to overcome the valve.. and thats without the spring!! so unless you have 30 pound boost in the piping and 10 in the manifold it wont leak.
the spring adjustment is there SOLELY TO ALLOW THE VALVE TO BE CRACKED OFF ITS SEAT AT IDLE. to avoid "flutter" and "reversion" on airflow meter equiped engines.
i use gtr bov on my engine. the bleed of at 12 pound, with no vac line attached. and with it ive no problems sealing 28 pound.....
chris your problem can be 2 things, most common is the actual setting on the boost controler. (if its electronic)
or the turbo is running out of puff. by looking at the graph id say is more the setting but could be the turbo reaching its limmit.
cheers