This guide provides detailed information on using an Integra Obd1 To Obd2 Jumper Harness for B-series engine swaps, primarily focusing on 5-speed vehicles.
Understanding the Basics
Before diving in, let’s clarify some key terms:
- OBD1: On-Board Diagnostics generation 1 (typically found in 92-95 Honda vehicles)
- OBD2: On-Board Diagnostics generation 2 (found in 96+ Honda vehicles), with subtypes OBD2a (96-98/99) and OBD2b (99-00/01)
- EWH: Engine Wire Harness
- VTEC: Variable Valve Timing and Lift Electronic Control
- CKF: Crankshaft Fluctuation Sensor
OBD1 Engine in an OBD2 Integra
Using an OBD1 engine in a 96-01 Integra offers a simplified wiring process due to the Integra’s 2-piece EWH design. This design allows for compatibility with OBD1 EWHs from:
- 94-95 Integra GSR
- 92-95 Civic Si/EX
- 93-95 Del Sol DOHC VTEC
This eliminates many of the wiring modifications required in Civic swaps. However, ensure VTEC components (solenoid, pressure switch, knock sensor) are wired correctly if using a non-VTEC Integra. The Integra’s integrated 2nd O2 sensor in the cabin harness further simplifies the process.
OBD1 to OBD2 Jumper Harness Options
A primary option for this swap is utilizing an Integra OBD1 to OBD2 jumper harness. This harness allows connection of an OBD1 ECU to the OBD2 chassis wiring.
Pros:
- OBD1 ECUs offer greater tuning flexibility.
- Eliminates the need for a CKF sensor bypass.
Cons:
- Emissions compliance may be affected.
- Requires wiring in a VTEC pressure switch.
Alternative ECU Options for Integra
Beyond the jumper harness, other ECU options exist:
- JDM OBD2 ECU: Direct plug-and-play but offers limited tuning potential and may not pass emissions tests.
- US OBD2 ECU: Requires a CKF bypass and 2nd O2 sensor wiring. Offers potential emissions compliance.
Civic OBD1 to OBD2 Swaps: Key Considerations
While this guide focuses on Integra, understanding Civic swaps provides context. Key differences and challenges in Civic swaps include:
- 1-Piece EWH: Requires more extensive wiring modifications for OBD1 engine compatibility.
- Distributor and Injector Plug Conversions: Necessary for OBD1 engine compatibility with OBD2 Civic harnesses.
- Alternator and IAT Modifications: Required to ensure proper charging and sensor function.
- CKF Bypass: Crucial for using a US OBD2 ECU with an OBD1 engine in a Civic.
Conclusion
Swapping an OBD1 engine into an OBD2 Integra or Civic requires careful planning and execution. The Integra OBD1 to OBD2 jumper harness simplifies the process for Integras, offering a viable solution for using an OBD1 ECU. However, each ECU option presents its own set of advantages and disadvantages. Understanding these nuances is essential for a successful engine swap. Remember to consult reputable resources and forums for specific wiring diagrams and detailed instructions based on your specific vehicle and engine combination.
