You are now ready to begin wiring in the Apexi AVC-R boost controller. Now open the white plastic protective cover to access the back of the ECU harness. Before unplugging your ECU, take this time now to disconnect the negative terminal on your battery to prevent any damage to your ECU. With the ECU removed, undo the 10mm bolt that secures the ECU harness to the computer. You should see the KA24DE ECU secured by 3 10mm nuts, remove these nuts and pull out your ECU so that you have the room to solder / tee / install the AVC-R. Remove the small plastic pop rivet that secures the upper tab to the chassis, and pull this panel away. The ECU is located behind the passenger side kick panel, and you will need to access the ECU to properly wire in the Apexi AVC-R. To begin our How To Install a AVCR in a 240SX S14 Guide, you will need to open your passenger side door and slide the passenger side seat as far back as it will go. This 2.4 liter truck engine is stout and has gobs of torque, unfortunately due to it’s undersquare design it’s not meant to rev as high as many would like. Today I’ll be showing you How To Install a AVCR in a 240SX S14, with a KA-T or a turbo kit on a KA24DE. If all things are equal in your turbo system, installation and dialing in the AVC-R is very easy and straightforward for the average shadetree mechanic.