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Getting half boost at the gauge.

F

falcz420

New member
I have a 1998 gtp with a smaller sc pulley, when I get on the car, I get full boost. After a few minutes of driving I only get half the amount, seems like this happens when the car get to normal operating temp. Anyone have any idea why this would happen?
 


How do you know that you are only getting half boost? I hope your not basing your questions on the boost gauge the car comes with. Let us know!!
 
yep i tested it out, only getting half boost. the gauge is correct. you can feel the difference also. not as powerful after you drive it for a while. any ideas?
 
It's possible your belt could be loose due to either being old and stretched out or your tensioner is not keeping sufficient tension. Or it could be you BBV. Those are a couple simple things to look at.
 


hi i have same problem, i pulled my lower vac line like you said and i got full boost on stock gauge connected it back and went back to half boost my question is where do i go from here? replace bbv? replace solenoid? or both? thanks any help really apreciated im new to the gtp scene
 
Question is...why are you going into boost when you're not at operating temperature in the first place?
 


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