Pleeaasse help ive had this prob for a while now but its really bugging me,



Car is a bone stock 95 type R2 Bathurst model with exception to the hks powerflow induction and a blitz NUR spec backbox. The cat is near brand new and the engine has only 5k since rebuild and was ran in perfectly by myself.



Using a blitz boost gauge the primary boosts instantly giving a solid 0.8kg/cm



The boost dips slightly at 4500rpm



The secondry comes on solid to 0.8kg/cm but then drops to 0.6kg/cm almost straight away and holds at 0.6 till redline.



Boost pattern 0.8 - 0.6 - 0.8 - 0.6kg/cm



I am gonna change the y pipe coupler tomorrow and the intake pipes/hoses, but if it was a boost leak wouldnt i have the problem on both turbos??.



Driving the car, It feels strong on the primary turbo and i get a healthy surge when the secondry comes in, but from 5k rpm upwards it feels like its underpowered to redline and i find myself shifting up early as the power just falls off.



Is maybe replacing all the check/oneway valves to viton replacement's worth a shot???







Thanks guys