Swapping a 2001 OBD2 B18C1 (GSR) engine into a 1991 Honda CRX DX presents unique challenges. This guide outlines my experience and potential solutions for a successful Obd2 Gsr Swap. My CRX is in excellent condition, equipped with an MSD 6AL ignition box (which might be removed for initial startup simplicity). The engine has a Skunk2 intake manifold as its only modification.
Wiring Harness Modifications for OBD2 GSR Swap
The biggest hurdle in this swap is wiring. I initially used a CRX harness converted for an OBD1 B-series swap. However, the OBD2 B18C1 has different connectors for the injectors, alternator, and distributor.
To address this:
- Distributor: Swapped the OBD1 distributor plugs for OBD2 plugs for a direct fit.
- Injectors: Replaced the OBD1 injector clips with OBD2 clips by soldering the correct plugs onto the harness.
- Alternator: Replaced the OBD2 alternator with a 1991 Acura Integra LS alternator, matching the OBD1 harness.
ECU and Jumper Harness
The ECU is a chipped and socketed P06 with a P72 basemap. This setup enables VTEC and IAB, while disabling knock control. Additionally, an OBD0 to OBD1 jumper harness connects the engine harness to the chassis harness.
Potential Issues and Troubleshooting OBD2 GSR Swap
While the core components are connected, several potential issues may arise with an OBD2 GSR swap in a CRX:
- Compatibility Issues: Even with the modifications, double-check all connections for proper mating and secure wiring. Pay close attention to sensor wiring and grounds.
- ECU Tuning: The P72 basemap may require further tuning for optimal performance with the Skunk2 intake manifold and specific vehicle setup. Consider professional tuning for best results.
- DA Linkage Modification: The throttle cable linkage from a DA Integra may require adjustments to fit the CRX chassis. Research specific modifications for proper installation.
- Starting and Idle Problems: Address potential vacuum leaks, fuel delivery issues, and ignition timing problems that may prevent starting or cause rough idling.
Completing the OBD2 GSR Swap
Beyond wiring and ECU considerations, remember essential cooling and power components:
- Radiator: Ensure proper radiator fitment and cooling fan operation for the B18C1.
- Battery: Connect a fresh battery with proper grounding.
Successfully completing an OBD2 GSR swap requires careful attention to detail and thorough troubleshooting. Addressing wiring discrepancies, ECU tuning, and potential mechanical issues will pave the way for a rewarding driving experience.
