MSD card
 

What is the function of the MSD card on the supercharger?

Are you talking about the blue MSD Box that often shipped with older JRSC Kits? If so, that is a piggyback timing controller that pulls timing based on boost. IIRC, it will pull a total of 6 degrees of timing, starting at about 4 lbs. of boost. That one does nothing to handle fuel, it just deals with timing.

If you are not talking about that one, can you share a little more info about which you are asking about?

-Jac