My supercharger project was completed almost at the weekend.
An Eaton M45 blower on to my 2.8 M104 engine. The fabrication although time consuming was relatively simple, the vacuum lines were a bit more of a headache. I have the Apexi fuel controller thanks to Blown_M104's recommendations. My blower came straight from a Mini cooper S although I found that the standard pulley was too small so I fitted it with a 19% smaller pulley. I also kept the silicon hoses down to a minimum becuse the pipes were bursting off under boost. I only getting 4.5psi at the moment but I plan to machine down the pulley to get the 6.5psi I ideally want.
Thats all the good news. Now the problems.
There is some popping and possible blow back I can hear from the engine now when I put my foot down after coming to a stop. Maybe the bypass valve isn't opeing fully, I have checked and it seems to be working but maybe the spring in it is still too strong.
But the biggest problem and here is where I need some advice if anyone can give it. The noise! The supercharger can be heard spinning from 200 yards away, its stops people in their tracks as they stop and stare.
I have read that most manufacturers put tuned induction pipes before the blower to prevent this, but have just the K&N. I've checked the oil in the blower casing & its okay. The blower when turned by hand moves freely but not loosely and not quitely, does anyone else know if the M45 blower is supposed to turn quietly and freely. As it is I've now took the whole thing off till I can sort the noise problem out because its embarrasing to drive. I figure I need a new supercharger or maybe just a normal airbox to deaden the sound.

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