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Waiting to install the EBCS is not a good idea.
I'm assuming this turbo is externally gated because you mentioned a spring - check your wastegate lines, this behavior sounds like you've damaged one of them. Even a sliver cut into one can cause over boost. How are you monitoring boost?
Absolutely find a tuner who can manage these issues. Do not drive the car under these conditions. Between running lean and over boosting before, it's a miracle your engine hasn't started to pretzel the rods.
Can you post these logs for us to see?
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Turbo FR-S Build - Build Thread
JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block |