I have an SPI boost guage that I installed about a month ago. My car is stock, and the guage would register 11 psi at WOT with both turbos spooled. This week, I did a couple of WOT runs and only hit like 9.5 psi. I was concerned that perhaps I had a problem with the sequential system, so I did the TTC mod. Guage still reads around 9.5 psi.
My question is this. When I turn the car off, the boost guage needle sits at just below zero, approximately 1.5 psi below (just a unit of measurement here; I realize there is only vacuum below the zero mark). Anyway, could it be that my guage is just a little off or does anybody think I have a boost leak? The car still feels strong, but I'm not capable of discerning a 1.5 psi boost leak by the seat of my pants.
My next thought is to test the guage by hooking it up to a controlled boost source (such as my front tire!) to see if it is accurate at various pressure levels.
BTW - my car is stock except for the boost guage and TTC mod. I checked the plastic "T" near the Turbo Pressure Sensor and I don't see any loose hoses or anything.
Any thoughts before I buy another guage? Do SPI guages tend to go bad with age (I bought this one used).
Thanks in advance.
My question is this. When I turn the car off, the boost guage needle sits at just below zero, approximately 1.5 psi below (just a unit of measurement here; I realize there is only vacuum below the zero mark). Anyway, could it be that my guage is just a little off or does anybody think I have a boost leak? The car still feels strong, but I'm not capable of discerning a 1.5 psi boost leak by the seat of my pants.
My next thought is to test the guage by hooking it up to a controlled boost source (such as my front tire!) to see if it is accurate at various pressure levels.
BTW - my car is stock except for the boost guage and TTC mod. I checked the plastic "T" near the Turbo Pressure Sensor and I don't see any loose hoses or anything.
Any thoughts before I buy another guage? Do SPI guages tend to go bad with age (I bought this one used).
Thanks in advance.