Viero,
You may want to try the 930 (turbo charging/super charging) board for a larger 930 oriented crowd. Both the 911 and 930 boards are filled with experts but are tailored to the different cars. Obviously there is overlap. I'm no expert but I've never known of a pop off valve on a 930. They typically are used on NA cars. Post it on the 930 board and you'll get some hits. Good luck!
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