just to revive the thread - just fitted an safc2 to my s2 r33, and no go. Trialled it when i had just wired in the power and earth and it fired up fine...did the rest of the wiring and the ecu just kept clicking and safc kept restarting......caused by the squarish solenoid in behind the ecu, you can feel it clicking. Disconnected the afm wire and joined them back to bypass the safc, it fired up fine. Set all the settings in the safc, turned it off, went upstairs for a bit.......came back down and now it won't fire up at all, just keeps clicking/restarting??? cut all wires bar the ground and power, and still clicking. At a loss, cause I soldered all the joins, no way they have come loose?? anyone have any suggestions?