Converting your 3si (Mitsubishi 3000GT/Dodge Stealth) from OBD1 to OBD2 offers enhanced logging capabilities, but it’s important to understand that tuning this platform isn’t as straightforward as some other vehicles. Unlike platforms with readily available off-the-shelf tunes and simple flashing tools, the 3si requires a more hands-on approach. Let’s explore the options for OBD2 conversion and what it means for tuning your 3si.
For those primarily interested in data logging, the BlackStealth MUT to OBD2 CANBUS converter provides a plug-and-play solution. This converter allows you to connect to your ’92 and similar year 3si models, outputting OBD2 data compatible with popular logging apps like Torque on Android or iOS. It also accommodates additional inputs for external sensors such as wideband oxygen sensors or boost pressure sensors. While this option facilitates logging, tuning with this setup is generally limited to piggyback systems.
For comprehensive tuning and logging capabilities, two primary paths emerge: swapping to a Chrome ECU or retrofitting a ’99 ECU. The Chrome ECU, available from 3SX, is designed for easy plug-and-play installation, providing immediate OBD2 logging and tuning functionality. It comes pre-configured for your specific vehicle, simplifying the process. Alternatively, a more budget-conscious approach involves sourcing and installing a ’99 ECU, which requires creating or acquiring a wiring harness for compatibility. Coding the ’99 ECU is also necessary to ensure proper integration. While the ’99 ECU retrofit may be more economical, the Chrome ECU offers a more streamlined, pre-configured solution.
Regardless of whether you choose the Chrome ECU or the ’99 ECU swap, you’ll be utilizing Chrome firmware. This unlocks significantly more tuning potential compared to basic piggyback controllers. Chrome opens access to advanced features such as launch control, ECU-controlled boost management, and support for larger fuel injectors, essential for E85 conversions and high-performance builds. Furthermore, it retains the built-in safety features of the stock ECU, adding a layer of protection.
To effectively utilize these OBD2 conversion methods, logging remains crucial. Tools like EvoScan for PC or the BlackStealth converter are necessary to capture vital engine data. Tuning, especially with Chrome, typically involves using a laptop PC and an Openport 2.0 cable in conjunction with ECUflash software. Unless you opt for professional dyno or street tuning services, you’ll be navigating the tuning process yourself. The learning curve can be considerable for those new to ECU tuning, but a wealth of information is available. Resources include guides on 3SGTO, a sister site, created by the developer of Chrome, and the broader Evo tuning community also offers relevant insights. Merlin’s Flash Guide is another valuable resource for understanding ECU flashing and tuning principles.
In conclusion, upgrading your 3si from OBD1 to OBD2 presents several viable options, each with its own advantages and considerations. Whether you prioritize simple logging with the BlackStealth converter or seek full tuning capability with a Chrome ECU or ’99 ECU swap, understanding the nuances of 3si tuning is essential. Be prepared for a more involved tuning process compared to some other platforms, and leverage the available community resources to guide you through your chosen path.
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