Quote:
Originally Posted by Burt Reynolds
Could the guage be off? I had that happen to an old subaru. Like you said, the dyno will tell but 3lbs off is quite a bit of boost.
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Gauge is right, and it's reading what it did on the dyno, which is what leaves me to believe it was another issue causing my low boost.
I believe the diaphragm got torn when it inverted or when I repaired it, even a small tear will do to prevent it from holding pressure above the spring pressure. I looked it up and the spring pressure is either 5 or 11 inches, 11 inches just happens to be 5.5 psi and it just happens to be exhibiting the symptoms of a torn diaphragm, which is not holding full boost, bleeding boost on quick throttle applications.
This is just another reason diaphragm valves are a horrid design, I'm finding a piston valve that will fit this flange and be done with it. So much more reliable.