Table of Contents
The B58 engine found in the M240i is renowned for its performance and tuning potential. This guide will explore how to elevate the power of your B58 M240i from its stock configuration to over 650 horsepower using a JB4 module and an upgraded intercooler.
Understanding the B58 Engine
The B58 is a 3.0-liter inline-six engine that features a twin-scroll turbocharger, direct fuel injection, and variable valve timing. It produces impressive power and torque right out of the factory, but tuning enthusiasts have found ways to unlock even more potential.
Stock Power Output
In its stock form, the B58 M240i delivers approximately 335 horsepower and 369 lb-ft of torque. This provides a solid foundation for performance upgrades.
Upgrading to JB4 Module
The JB4 tuning module is one of the most popular options for B58 owners looking to increase power. It is a plug-and-play solution that allows for easy adjustments and monitoring of engine parameters.
Benefits of the JB4 Module
Using the JB4 module provides several advantages:
- Increased Power: Gains of 50-100 horsepower are common with the JB4.
- Customizable Settings: Users can adjust settings based on fuel type and driving conditions.
- Data Monitoring: Real-time monitoring of engine performance metrics.
Installing the JB4 Module
Installing the JB4 is straightforward and can typically be done in under an hour. Here’s a brief overview of the installation process:
- Disconnect the battery.
- Locate the engine harness connectors.
- Plug the JB4 connectors into the appropriate harnesses.
- Reconnect the battery and start the engine.
Upgrading the Intercooler
An upgraded intercooler is essential for maximizing the benefits of the JB4 module. The stock intercooler can become inefficient under increased boost levels, leading to heat soak and reduced performance.
Choosing the Right Intercooler
When selecting an intercooler, consider the following:
- Core Size: A larger core will improve cooling efficiency.
- Material: Look for high-quality aluminum construction for durability.
- Fitment: Ensure compatibility with your M240i model.
Power Levels with JB4 and Upgraded Intercooler
With the JB4 module and an upgraded intercooler, power levels can exceed 650 horsepower. Here’s a breakdown of potential power gains:
- Stage 1: Approximately 450-500 horsepower with JB4 and stock intercooler.
- Stage 2: 550-600 horsepower with JB4 and upgraded intercooler.
- Stage 3: 650+ horsepower with additional modifications and tuning.
Additional Modifications for Maximum Power
To achieve the highest power levels, consider the following additional modifications:
- High-Flow Fuel Injectors: Necessary for increased fuel delivery.
- Upgraded Turbocharger: A larger turbo can significantly boost power output.
- Exhaust System: A high-performance exhaust can improve airflow and reduce back pressure.
Conclusion
The B58 M240i is a powerful platform with excellent tuning potential. By upgrading to a JB4 module and an upgraded intercooler, you can significantly increase your horsepower and enjoy an exhilarating driving experience. Always ensure that your modifications are compatible and consult with professionals if needed.