The question of integrating modern technology into classic vehicles often arises in the automotive enthusiast community. One such query revolves around adding OBD2 (On-Board Diagnostics II) to older cars. While seemingly straightforward, the process and necessity of such an upgrade are more nuanced.
The initial thought for many is the convenience of plugging in a ScanGauge or similar OBD2 devices for real-time data and diagnostics. However, achieving this functionality in a pre-OBD2 vehicle is not simply a matter of plugging in a port. Older cars lack the fundamental sensor infrastructure and communication protocols that OBD2 relies upon. Implementing full OBD-II diagnostic capability would necessitate the installation of numerous sensors across various vehicle systems. Alternatively, one could attempt to simulate sensor readings, a complex and potentially unreliable workaround.
For those seeking basic digital readouts, a more pragmatic approach might be to directly tap into existing sensors, where available. An Arduino or similar microcontroller could then be employed to display this information. This method, while still requiring technical expertise, bypasses the complexities of creating a fully functional OBD2 system. Furthermore, solutions like the MPGuino already exist for those primarily interested in fuel economy data, offering a simpler, targeted approach.
Interestingly, the context shifts when considering electric vehicle (EV) conversions of older vehicles. In such cases, the desire for a CANbus system – the backbone of OBD2 – might stem from the new EV components rather than replicating traditional engine diagnostics. Building a custom CANbus network for an EV conversion, while a significant undertaking, could be beneficial for managing and monitoring the electric powertrain. This approach aligns with a complete vehicle overhaul where existing systems are replaced, allowing for a tailored integration of modern electronic controls.
Ultimately, deciding whether to add OBD2 capabilities to an older car depends heavily on the desired outcome. For simple data display, direct sensor connections or specialized devices are more efficient. For comprehensive diagnostics mirroring modern vehicles, the complexity and effort increase dramatically. In the unique scenario of EV conversions, a custom CANbus system may become a more relevant consideration, driven by the needs of the new electric powertrain rather than a direct OBD2 retrofit.
