when i turned up my boost to 8lbs today on the actuator of my internal wastegate i noticed it doesnt stay at 8 lbs. As it spools up it hits 8lbs at about 3500 untill 4500 then it drops to 5 psi and stays there till redline.

do i have a leak in my piping?
does my IC suck that bad?
is it something vac line related?
or is my int. wastegate broke?

Help please

 

whats the turbo size?

 

If it was leaking it wouldnt be holding a constant psi to redline. My bet is something with the internal wastegate.

 

its the 15g turbo d16z6 kit
should i run the vac line to the manifild instead of the turbo housing because of my intercooler?

 

Yes. I think it is pretty much agreed on by all that the wastegate vacuum is better off coming straight from the manifold.