Up VR4 performance

problem :
At the beginning my turbo was creeping till 0.8 ..
Now want to boost 1bar
Fixed metal gasket
Fixed in the Fish Tank Valve
My max boost is 0.9 .. i open how many valves also my boost will stick to 0.9
wht could be the prob over here. internal wastegate ka ? or is it blow off tak tahan ? car no more kick like last time , gsr also tapau hehehehe

carcraze : just to adjust the fuel pressure.
 

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