The B20 VTEC engine, a popular choice for Honda enthusiasts, offers a compelling blend of power and efficiency. This article explores performance chip tuning options for B20 VTEC engines, specifically focusing on compatibility with OBD2 systems. Understanding the nuances of OBD2 and its interaction with chipped ECUs is crucial for maximizing performance gains while maintaining vehicle reliability.
While the B20 engine itself isn’t factory equipped with OBD2, many engine swaps utilize this powerplant in chassis that do. This necessitates careful consideration when choosing a performance chip. Direct plug-and-play chips are not available for OBD2 B20 VTEC setups. Instead, you’ll typically need to utilize an OBD1 ECU (such as a P28, P72, P08, P30, P61, or P91) along with a conversion harness. This harness allows the OBD1 ECU to communicate with the OBD2 vehicle’s sensors and systems.
This tuned chip for the B20 VTEC engine is designed to enhance power and torque across the RPM range, peaking at 8100 RPM. Ideal for both drag and circuit racing, this modification optimizes the timing and fuel curves to unlock significant horsepower gains. Depending on your specific engine configuration, expect an increase of 8 to 20 horsepower.
Key features of this B20 VTEC performance chip include:
- VTEC Engagement: Set to activate at 4750 RPM, providing a noticeable power surge in the higher RPM range.
- Rev Limit: Increased to 8100 RPM, allowing the engine to safely operate at higher speeds.
- Idle: Adjusted to 850 RPM for a stable and consistent idle.
- Knock Sensor: Can be enabled or disabled based on tuning preferences and fuel quality.
- Speed Limiter: Removed for unrestricted performance.
- O2 Sensor: Can be enabled or disabled for custom tuning options.
- Oil Pressure Switch: Can be enabled or disabled.
- Shift Light: Available upon request and customizable to a specific RPM for optimal shifting.
- 2-Step Launch Control: Optional for vehicles with hydraulic transmissions and speed sensors. This feature allows for consistent and aggressive launches. Note: Not compatible with cable transmissions.
- Customizable Options: Additional features, such as disabling IAVC (Intake Air Volume Control) and VTEC speed check, are available upon request.
This chip is compatible with various Honda models, including Civic, CRX, Del Sol, Integra, Accord, Prelude, and CRV (with appropriate OBD2 to OBD1 conversion harnesses). Popular chassis codes include EG, EF, SIR, SI, EF9, EM1, and CRX. Remember, if your OBD1 ECU is not already socketed, a chipping kit will be required for installation.
In conclusion, achieving optimal performance with a B20 VTEC in an OBD2 chassis requires understanding the compatibility challenges and utilizing the right components. By using a chipped OBD1 ECU and a conversion harness, you can unlock the full potential of your B20 VTEC engine. Remember to consult with a qualified tuner for personalized adjustments and to ensure safe and reliable operation.
