why is my boost dropping off? (boost pattern inside)
#1
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
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
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Phuong
2nd Generation Specific
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01-28-2010 09:00 AM
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