Rywire is a well-known name in the Honda and Acura tuning community, renowned for their high-quality engine harnesses. This guide focuses on their B-series harness for OBD2 applications, covering compatibility, features, and important considerations.
Rywire’s budget-friendly B-series engine harness, designed for both D-series and B-series engines, shares remarkable similarities with their mil-spec line. The key distinction lies in the single black wire color and expandable loom used in the budget version. This harness is meticulously crafted with new connectors and materials. Each connection is secured using pneumatic crimping heads for an OEM-grade crimp, and clearly labeled for straightforward installation. Crucially, all interference-prone circuits are shielded and grounded with appropriate wire covering. Every harness undergoes rigorous quality testing, including pin-to-pin verification and resistance checks to guarantee voltage stability.
Understanding OBD1 and OBD2 Compatibility
A critical aspect of Rywire harnesses is their OBD1 (92-95) computer connector configuration. While the harness itself is built for OBD1, using it with OBD2a or OBD2b ECUs requires a specific adapter. Importantly, Rywire harnesses do not directly support USDM OBD2 computers. However, they are compatible with aftermarket ECUs utilizing OBD2 plugs and non-USDM OBD2 computers (with the exception of stock H22 and GSR computers).
Adaptability and Chassis Compatibility
Rywire harnesses are designed with adaptability in mind. Each harness includes a custom sub-harness tailored to the specific chassis selected during purchase. This modular design allows for chassis changes without needing a complete harness replacement; only a new sub-harness is required. This feature significantly reduces cost and simplifies the process if you decide to swap your engine into a different chassis. While Rywire does not offer refunds on these harnesses, they are warrantied and guaranteed to function correctly. Existing customers can purchase replacement sub-harnesses separately by contacting Rywire directly. This modular design emphasizes long-term value and flexibility for engine swaps and upgrades.
Rywire B-Series Harness Features and Connectors
The Rywire B-series harness is comprehensively equipped with a wide array of connectors, catering to all essential engine functions:
- Oil Pressure Sending Unit
- Knock Sensor
- Intake Air Temperature (Intake Manifold Style)
- Oxygen Sensor (Primary 4 Wire)
- OBD2 Alternator Plug
- Two Extra Wires for Customization
- OBD2 Injectors 1-4
- MAP Sensor
- TPS (Throttle Position)
- Idle Control Motor
- Electronic Speed Sensor
- Dedicated Ground Connection
- Fan Switch
- OBD2 10-Pin Distributor Plug
- H2O Sending Unit (for Gauge Cluster)
- Reverse Lights
- Engine Coolant Temperature Sensor
- Starter Signal
- VTEC Solenoid
- OBD1 Computer Plugs A, B, D
- Power Distribution Cap Connection
Chassis-Specific Installation Instructions
Rywire provides detailed installation instructions for various chassis and engine combinations:
These resources cover installations for 88-91 CRX/Civic, 90-91 Integra DA, 92-95 Civic/Integra, and OBD2a/OBD2b vehicles. Consult the appropriate guide for your specific application to ensure a smooth and successful installation.
Conclusion
The Rywire B-Series harness for OBD2 applications presents a robust and adaptable solution for engine swaps and upgrades. Its compatibility with various chassis, comprehensive connector set, and high-quality construction make it a popular choice among enthusiasts. Understanding the OBD1 to OBD2 adapter requirement is crucial for proper functionality. Remember to download the correct chassis-specific installation guide from Rywire’s website for a seamless installation process.
