The HKS F-CON SZ is a ?piggy-back? fuel and timing controller developed for basic and mid-level tuning. The F-CON SZ provides fuel and ignition control by modifying the factory fuel and ignition maps. Fuel can be added or subtracted while ignition timing can be adjusted within the range of ? 15? of the factory maps. Each fuel and ignition map utilizes a 16×24 Load vs. Rpm resolution map. Up to four different fuel and ignition maps can be stored internally and set for various configurations.