The R4 software is a Windows™ based software package that provides the user interface for a variety of Split Second engine management products. It controls the AIC1 Additional Injector Controller, PSC1 Programmable Signal Calibrator and FTC1 Fuel/Timing Calibrator families of products. It operates on a Windows™ 95/98/XP/2000/Vista platform. Calibration files can be created, edited and documented within the R4 program. The program supports reading and writing these files to programmable Split Second products in order to implement the engine tuning process. Data communication is through a 9-pin serial port and may be implemented with a USB to serial adapter. The R4 program also supports up to four auxiliary inputs and data logging.