05-03-2012, 10:23 AM
Join Date: May 2012
Jeep YJ M90 supercharger build
My 4.0 YJ has been sitting around in my garage for over 3 years with rotted holes of the size of baseballs in its frame. Paying college up front + the cost of living and feeding my Mini Cooper S made it impossible to dedicate any leftover money to the Jeep.
Now that I'm done with College bills until next year, I thought it would be a perfect time to rebuild it and do what I always wanted to it, Supercharge the stock 4.0!
As of now, I'm still searching local Junkyards for a solid frame. In the mean time, I'm gathering as much info as I can on the build.
One of the reasons that I'm confident of supercharging it is because I have complete access to a CNC machine for light duty mounts, brackets, pulleys, adapters etc..
I'm planing everything out on paper before getting into it completely, and as you all can imagine I'm coming across a few obstacles.
1. Please feel free to correct me if I'm wrong, I read somewhere that the AX-15 tranny is rated at 300lbs of tq on the dot. If so, the input shaft will snap on the first dyno run when it's time to tune the engine. I'm willing to rebuild it, not swap it.
2. ECU remap, I'm thinking about running megasquirt as of now, if anyone knowns anything better to use on this application, please feel free to contribute.
3. Engine Temp!! Keeping the engine temperature down is my biggest obstacle at the moment. The M90 charger will pump 12psi at the most, even though the compression in this engine is relativelly low I'm still worried about overheating it. I believe that an intercooler is enough, but I'm starting to consider an oil cooler as well.
Stock fuel delivery is all junk. New and updated regulator, pump, and rail will be used.
I encourage you all to contribute with ideas that might help me on this one.