I was running the entire serpantine setup that comes with the Stillen kit and it did not slip until about 15 psi. I realize that's not much help, but the belt and pulleys Stillen provides should not slip at 9 psi if setup properly.
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Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing]
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