Thread: Eaton M90 Gen V supercharger problems

Maybe some of you can help me on this. I recieved an OEM supercharger gasket a few days ago in the mail its gray with orange silicon going around coolant passages. My question is the opening on the gasket is smaller than the opening on the lower intake manifold as well as the supercharger opening, by about 2 inches or so. Have you all seen this before and is this normal, because I cut the opening to the same as the lower intake and I think its caused a little vacuum leak around the supercharger. The reason why I think this is because I went from a 3.8 pulley to a 3.5 pulley with supporting mods and ported heads and my boost went from like 8psi wot to 5psi wot.

Yeah just installed a guage its at around 20psi at idle but then when I drive it and hit the gas it drops to around 10psi

Okay well is the oem supercharger gasket suppose to be smaller than the opening on the supercharger, and also do you think that because of the ported heads its decreased my boost even with a 3.5 pulley. Also the digital boost thats the stock boost guage doesnt go all the way up either.

Okay is the OEM supercharger gasket smaller than the opening for the supercharger and LIM?

no I dont have any pictures, the gasket stuck over 2 inches from the passenger side everything else matched up perfect.

damn I got raped on that deal. I was wondering why he only wanted 15.00 bucks for it. Well I cut it out anyway and used black high temp rtv silicone on the side that I cut out. So far it works fine other than switching my pulley and actually loosing boost. Thanks for help man it makes sense to me