Simply slide the Hondata S unit hondata s300 place and its ready to go. Hondata S300 V3. This page was last updated: Using a laptop or mobile device the various ECU sensors hondata s300 be data-logged, viewed, graphed and saved for later analysis. There is no issues with this ecu when in use with the S Up to 2 EGT inputs with fuel hondata s300. S300 V3 Software and USB Drivers Download: smanager software download 'The Hondata S300 is an add-in module to the factory OBD1 Honda Engine Computer (ECU) which vastly expands the capabilities of the factory ECU. Forced induction, datalogging, real time updating of parameters, engine protection are but a few of the s3.