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Mp112 low boost help!

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I just installed a used magnacharger mp112 on my 04 Ss. Everything went good Untill I hooked my boost gauge up l, it has the 3.4 pulley on and it's only pushing 3 lbs of boost. I swapped in my 2.9 and it's making 6 but I understand that it should be making closer to 10 lbs. I'm completely new to Superchargers, belts good and tight so I don't suspect belt slip. I don't really know how to test the bypass by it moves freely. Any help would be great!

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  • 2 weeks later...

Yeah the motor is stock. But I found out that while off my boost Gauge reads -3 vacumme. So 9-10 psi through the 2.8 pulley is about right, I went a head and went back to the 3.4

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