I have always wanted to supercharge my 330Ci and I am way too cheap to buy one of the pre-made kits, so I thought it would be fun to build my own. I started off looking at some of the common superchargers out there, the Eaton M90 and the SC 14 but they seemed pretty tapped out at 6 PSI on our motors. I eventually landed on the AMG supercharger out of a SLK 32. This supercharger is a twin screw and should be able to supply 15 PSI pretty easy. I found one for cheap on ebay and bought it.
First step was to cut off the cast-in intake runners off and see where it fit. I conveniently had an e46 parts car that I was able to do most of the mocking up on. I stacked some wood under the supercharger and made a CAD (cardboard aided design) template.
![919371]( "919371")
I chose the alternator mounting holes to secure the mount plate.
![919372]( "919372")
Things were looking good and I needed to hold the supercharger a little better to figure out where all the piping would go and if it could even fit. I converted the CAD template to plywood and started mocking up the outlet of the supercharger. I bought a generic 2.5" intercooler piping kit and got to work.
![919373]( "919373")
Next up was the intercooler. I wanted an air to air intercooler where the air flowed from top to bottom instead of side to side to keep boost losses to a minimum. I found one that would work well, but the inlet and outlets were pointing in opposite directions. In order to keep piping and losses to a minimum I cut off one of the end tanks and welded it back on the other direction.
![919374]( "919374")
I mounted the intercooler to a skid plate that is on the car to protect the radiator for ice racing. I have hit one too many snow banks before...
![919377]( "919377")
I started to work on the actual supercharger mount plate. I used a plasma cutter to cut it out of 3/8" thick aluminum. My welder barely had enough ass to weld it. It kept tripping my 240V 60 amp breaker while welding this guy.
![919379]( "919379")
First step was to cut off the cast-in intake runners off and see where it fit. I conveniently had an e46 parts car that I was able to do most of the mocking up on. I stacked some wood under the supercharger and made a CAD (cardboard aided design) template.
I chose the alternator mounting holes to secure the mount plate.
Things were looking good and I needed to hold the supercharger a little better to figure out where all the piping would go and if it could even fit. I converted the CAD template to plywood and started mocking up the outlet of the supercharger. I bought a generic 2.5" intercooler piping kit and got to work.
Next up was the intercooler. I wanted an air to air intercooler where the air flowed from top to bottom instead of side to side to keep boost losses to a minimum. I found one that would work well, but the inlet and outlets were pointing in opposite directions. In order to keep piping and losses to a minimum I cut off one of the end tanks and welded it back on the other direction.
I mounted the intercooler to a skid plate that is on the car to protect the radiator for ice racing. I have hit one too many snow banks before...
I started to work on the actual supercharger mount plate. I used a plasma cutter to cut it out of 3/8" thick aluminum. My welder barely had enough ass to weld it. It kept tripping my 240V 60 amp breaker while welding this guy.
