Originally Posted by BlueBolt66

interesting.... Eaton said not to port exit only the inlet otherwise it bring the blower out of efficinecy and will make you lose power rather than give. the point of the supercharger is to compress the air and force it into the intake. When you ported out your supercharger the way you did I would imagine you brought the supercharger way out of efficiency, with a bigger exit flange the air isn't compressed as much and doesn't give you as much pressure (PSI or BOOST). I ported my throttle body and supercharger inlet, have a 2.8 pulley and a full 3" exhaust and am boosting 17.9 PSI and I believe I may hav a vac leak somewhere cuz I have a whistle when I begin boost and while I boost. It's wierd nobody I've talked to has ever heard anything like it before, sounds almost like a turbo.

Originally Posted by BlueBolt66

interesting.... Eaton said not to port exit only the inlet otherwise it bring the blower out of efficinecy and will make you lose power rather than give. the point of the supercharger is to compress the air and force it into the intake. When you ported out your supercharger the way you did I would imagine you brought the supercharger way out of efficiency, with a bigger exit flange the air isn't compressed as much and doesn't give you as much pressure (PSI or BOOST). I ported my throttle body and supercharger inlet, have a 2.8 pulley and a full 3" exhaust and am boosting 17.9 PSI and I believe I may hav a vac leak somewhere cuz I have a whistle when I begin boost and while I boost. It's wierd nobody I've talked to has ever heard anything like it before, sounds almost like a turbo.