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Most of the times, does not matter, how big WG is. The boost creep in most cases is due to manifold design, not WG size. But we all know that most of the designs are made, due to fitment/rad. power steering,etc/, so even if you have 60mm, you still might have creep. Recently I spoke with TIAL rep and he told me that. Your mani, looks similar to Full-Race for example, but it is safe to say that you might get 1-2psi creep, cause that WG tube is coming 90* off the collector, when it should be facing down towards the flow, to make it easier for exhaust gases to diverted to WG, instead going to the turbine wheel.
I have three cases:
myself with ERL mani Tial 44
two of my friends, one with Shearer T3, other one Full-Race T4, both with Tial 44.
All of us get a Little creep, mine is 1PSI, which is considered normal/ but I run only 22 psi. Theirs is like 3 PSI more in 4, than 3 gear/but both of them are race cars, running 38-39PSI/.
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