reno chin GTT

i change back to the stock turbo, and the problem solve, the stock turbo is 0.63 AR and new turbo is 0.48 AR , stock is single blade ,new turbo is double blade. which i think it cause the problem ?

already check Vacuum leak, fully secure and tight, even change new hose. diagnose no fault code, what if exhaust manifold leak? after problem occur i install emanage hope can solve but its the same. but my final decision will put back the ori stock turbo, if everything ok, then is the turbo.

hi all members! i my facing a new problem, after i change a new turbo (actaully a same type of stock turbo replace a bigger compressor and turbine wheel) the car rpm drop to 300rpm or nearly stall, when i stay on 2500rpm up to 4000 rpm , but if i full throttle its fine, this all happen just after change the turbo, check already with MAF / fuel pressure regulator / spark plug/ and even install emanage ultimate, BOV circulation . do you think the turbo is not suitable with my inlet manifold? compressor stall ? heard people said is boost cut , but before 0.8 bar also no cut why this time 0.5 bar already cut, they said bcoz bigger compressor wheel, do you think is true? skyline r34 GTT Auto Trans emanage ultimate stock injector HKS pod ext wastegate 0.7bar after market dumb pipe stock AFM

i got this problem also, its fine now after i change the boost sensor.