The AEM OBD2 X-Series wideband gauges are popular for their accuracy and ease of installation. A common question among users is how to log data from these gauges, particularly in vehicles without a factory high-resolution oxygen sensor. This article addresses data logging options for the AEM X-Series, focusing on its compatibility with OBD2 and other potential output methods.
The AEM X-Series gauges primarily utilize the OBD2 port for communication. While the OBD2 protocol offers standard data parameters, it may not provide the high-resolution data required for precise tuning. Therefore, direct logging through the OBD2 port alone might not be sufficient for applications requiring detailed AFR readings.
AEM wideband gauges typically include a sensor for accurate AFR measurements. However, logging this data often requires additional hardware and software. Solutions like the Tactrix Openport connector, combined with software like EvoScan, enable data logging from various sources, including wideband sensors.
Connecting an AEM wideband gauge to a laptop for logging usually involves utilizing a serial-to-USB converter. This requires identifying the correct signal and ground wires from the gauge’s data output and connecting them to the corresponding pins on the serial-to-USB adapter. Within the data logging software, you then select the appropriate COM port and wideband sensor type (e.g., UEGO) to display and record the AFR values.
Alternatively, some users utilize the disabled second O2 sensor wires in conjunction with specific ECU modes (like Mode 23) to log wideband data. This method involves re-purposing the existing wiring for the wideband signal, eliminating the need for additional wiring. However, this process requires detailed knowledge of the vehicle’s wiring and ECU configuration.
For more advanced applications, the AEM X-Series might offer data output capabilities beyond the standard OBD2 protocol. This could involve a dedicated data logging wire or compatibility with AEM’s Infinity ECU. Consulting the AEM X-Series documentation will clarify specific output options and signal types.
Ultimately, logging data from an AEM OBD2 X-Series wideband gauge depends on the specific gauge model and the desired level of data resolution. While the OBD2 connection provides some data, leveraging a serial-to-USB converter or utilizing disabled O2 sensor wires offers more comprehensive logging capabilities. Understanding the gauge’s output options and utilizing appropriate hardware and software are crucial for successful data acquisition.
