For those venturing into aftermarket wideband air-fuel ratio (AFR) gauges like the AEM X-Series, a common question arises: how to effectively extract data for logging and engine tuning purposes, particularly when integrating with OBD2 systems. Many enthusiasts and technicians seek to monitor real-time AFR data to optimize engine performance and diagnose potential issues. Let’s delve into the methods for connecting your AEM X-Series wideband gauge for data logging.
One straightforward approach, commonly utilized and mirroring experiences with older wideband gauges, involves leveraging a serial-to-USB connection. This method taps into a dedicated data output present in many AEM wideband systems. By identifying the correct signal and ground pins on your AEM X-Series gauge, you can establish a data stream via a serial-to-USB cable directly to your laptop. Software like EvoScan can then be configured to read AFR values from the designated USB COM port. Within EvoScan, you would typically select a generic wideband sensor option, such as UEGO, and map it to the assigned COM port, enabling real-time AFR logging alongside other engine parameters.
Another potential, albeit less frequently used, method involves repurposing the wiring from a disabled factory oxygen sensor. This technique is often considered when the secondary oxygen sensor is deactivated, for instance, in modified vehicles running in Mode 23. By tapping into the signal wires of the disabled oxygen sensor harness, it might be possible to feed the AEM wideband signal into the engine management system or a data logger. However, this method requires careful wiring and a solid understanding of your vehicle’s electrical system and is less universally applicable than the serial-to-USB approach.
In summary, while the AEM X-Series wideband gauge prominently features an OBD2 connector for power and potentially some data output, direct OBD2 data logging capabilities can be limited depending on the specific application and software. For reliable and comprehensive data logging, especially when aiming for integration with software like EvoScan, exploring the serial-to-USB data output option on your AEM X-Series gauge is often the most adaptable and effective solution. Consulting the documentation for your specific AEM X-Series model will provide definitive guidance on available data output methods and wiring configurations.
