The P28 ECU is a popular choice for Honda engine swaps and performance tuning, particularly in OBD2 systems. This article will explore the versatility of the P28, its compatibility with various Honda engines, and considerations for using it in OBD2 to OBD1 conversions.
P28 Compatibility Across Honda Engine Series
The P28 is remarkably adaptable, capable of managing a wide range of Honda engines, including those from the B, D, H, and F series. This versatility stems from its programmable nature, allowing tuners to modify fuel and ignition maps to suit specific engine configurations. Even some Nissan 240SX owners have leveraged the P28’s tunability by pairing it with a Honda distributor for enhanced engine control.
B-Series Swaps and the P28 in EG Civics
Swapping a B-series engine, such as a Civic Type-R or Integra Type-R engine, into an EG Civic chassis often involves utilizing a P28 ECU. The process is similar to other B-series swaps, and readily available DIY guides offer step-by-step instructions.
Wiring Considerations for OBD2 Conversions
When using a P28 in an OBD2 to OBD1 conversion, it’s recommended to retain the original D-series engine harness. This simplifies the wiring process and ensures compatibility with existing sensors and actuators. Key adjustments include addressing the knock sensor (either adding one or deleting it in the ECU software) and extending the oxygen sensor wires. Utilizing OBD1 D-series injectors and alternator further streamlines the conversion. An OBD1 LS or GSR alternator can also be used if desired.
Choosing a P28: Tuning and Reputable Sources
Avoid using pre-programmed P28 ECUs from unknown sources, often referred to as “Kenji” chips. Instead, opt for a reputable tuning shop that can provide a custom chip and tune tailored to your specific engine setup. Professional tuning ensures optimal performance and reliability.
K-Series Engines: A Different Approach
While theoretically possible to use a P28 with a K-series engine, it’s significantly more practical and cost-effective to utilize a K-series ECU and a KPro programmable ECU. This setup offers greater control over the K-series engine’s advanced features and allows for more comprehensive tuning options.
Conclusion: The P28 – A Versatile Tuning Solution
The P28 ECU remains a powerful tool for Honda engine enthusiasts, offering a versatile and affordable solution for engine swaps and performance tuning. When undertaking an OBD2 conversion, careful consideration of wiring, sensor compatibility, and professional tuning are crucial for a successful outcome. For K-series engines, however, dedicated K-series engine management systems provide a more suitable approach.
