For owners of older vehicles still running on OBD1 systems, the desire to access modern diagnostic capabilities is a common one. While platforms like BMW offer straightforward tuning and flashing options, vehicles requiring an OBD1 to OBD2 conversion present a unique set of challenges. Specifically for platforms like the Mitsubishi 3000GT or Dodge Stealth, direct OBD2 upgrades aren’t inherently simple, but workable solutions are available to bridge this technological gap. Let’s explore the options for OBD1 to OBD2 conversion, focusing on logging and tuning your vehicle.
Options for OBD1 to OBD2 Conversion
Several paths exist when considering an OBD1 to OBD2 conversion, each with its own advantages and considerations, particularly regarding vehicle diagnostics and engine tuning.
BlackStealth MUT to OBD2 Converter: Focus on Logging
For those primarily interested in data logging, the BlackStealth MUT to OBD2 CANBUS converter offers a streamlined solution. This device plugs into your older vehicle’s MUT (Mitsubishi Unified Terminal) system and translates the data into OBD2 protocol. This conversion allows you to use standard OBD2 logging tools, such as the Torque app on Android or iOS devices. The BlackStealth converter also often includes provisions for integrating additional sensors like wideband oxygen sensors or boost pressure sensors, expanding your data acquisition capabilities. While excellent for monitoring your engine’s performance, it’s important to note that with this setup, engine tuning is typically limited to piggyback systems, which work alongside the factory ECU rather than reprogramming it directly.
ECU Swap: Chrome ECU or ’99 ECU Upgrade for Tuning and Logging
For enthusiasts seeking both enhanced logging and more sophisticated tuning capabilities, swapping the Engine Control Unit (ECU) emerges as a more comprehensive approach. Two primary options exist within this category:
Chrome ECU
The Chrome ECU, readily available from vendors specializing in these platforms like 3SX, presents a plug-and-play solution for OBD2 conversion. Designed specifically for vehicles like the Mitsubishi 3000GT/Dodge Stealth, the Chrome ECU is pre-configured for your car, ensuring a relatively straightforward installation process. Crucially, it enables both OBD2 logging and advanced tuning. Choosing a Chrome ECU unlocks access to features far beyond basic piggyback tuning, including functionalities like launch control, ECU-controlled boost management, and support for larger fuel injectors often needed for E85 fuel conversions. Furthermore, it retains the built-in safety features of the stock ECU, providing an added layer of protection for your engine.
’99 ECU Retrofit
Alternatively, a more budget-conscious but labor-intensive route involves retrofitting a ’99 ECU from a later model of your vehicle (if applicable) or a compatible platform. This method requires creating or sourcing a custom wiring harness to adapt the ’99 ECU to your older vehicle’s wiring. Coding may also be necessary to ensure full compatibility and functionality. While potentially cheaper in terms of hardware acquisition (if you can find a good deal on a ’99 ECU), the ’99 ECU retrofit demands a greater degree of technical skill in wiring and potentially ECU programming. Like the Chrome ECU, the ’99 ECU upgrade facilitates OBD2 logging and opens the door to advanced tuning options, typically utilizing Chrome firmware for enhanced capabilities.
Tuning and Logging Tools
Regardless of whether you opt for the BlackStealth converter or an ECU swap, you’ll need appropriate tools for logging and tuning. For PC-based logging, EvoScan is a popular choice. BlackStealth’s converter itself also provides logging capabilities. For tuning, a laptop PC and an Openport 2.0 cable are essential for use with ECU flashing software like ECUflash.
It’s important to acknowledge that delving into ECU tuning has a learning curve, particularly for those new to engine management systems. However, a wealth of information is available to guide you. Resources like the guide on 3SGTO (a sister site to 3SX), created by the developer of Chrome ECU, offer platform-specific guidance. Furthermore, information from the Mitsubishi Evo community is often relevant and transferable. Merlin’s Flash Guide is another valuable resource for understanding ECU flashing and tuning principles.
Conclusion
Converting from OBD1 to OBD2 on older vehicles like the Mitsubishi 3000GT or Dodge Stealth offers significant benefits in terms of diagnostic access and tuning potential. Whether you choose the simpler BlackStealth converter for logging or undertake an ECU swap for comprehensive tuning and logging, carefully consider your goals, budget, and technical comfort level. Each option provides a pathway to modernize your vehicle’s engine management system and tap into a broader range of diagnostic and performance enhancements. Good luck with your OBD1 to OBD2 conversion journey!
