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The B58 engine found in the M240i has gained a reputation for its impressive performance and tuning potential. One of the key upgrades that enthusiasts consider is the fuel system. Upgrading to a Walbro 450 fuel pump and larger injectors can significantly enhance power gains, allowing the engine to perform at its peak.
Understanding the B58 Engine
The B58 is a 3.0-liter inline-six engine that features a twin-scroll turbocharger. This engine is known for its smooth power delivery and high torque output. However, like any performance engine, it has its limits. To unlock more power, modifications to the fuel system are often necessary.
Why Upgrade the Fuel System?
Upgrading the fuel system is crucial for several reasons:
- Increased fuel flow to support higher power outputs.
- Improved fuel atomization for better combustion.
- Enhanced reliability under high-performance conditions.
Walbro 450 Fuel Pump Overview
The Walbro 450 fuel pump is a popular choice among performance enthusiasts. It is capable of delivering a high volume of fuel, which is essential for engines that have been tuned for increased power. This pump is designed to fit directly into the factory fuel system, making installation straightforward.
Key Features of the Walbro 450
- Flow rate of up to 450 liters per hour.
- Compatible with both gasoline and ethanol fuels.
- Durable design for long-lasting performance.
Bigger Injectors: Why They Matter
In addition to the fuel pump, upgrading the fuel injectors is equally important. Larger injectors can provide the necessary fuel volume to match the increased air flow from performance upgrades like a bigger turbocharger or improved intercooler.
Selecting the Right Injectors
When choosing larger injectors, consider the following:
- Injector flow rate should match your power goals.
- Compatibility with the B58 engine and fuel system.
- Quality and reliability of the injector brand.
Power Gains from Upgrades
After upgrading to a Walbro 450 fuel pump and larger injectors, many M240i owners report significant power gains. These upgrades allow the engine to run more efficiently and produce more horsepower and torque.
Expected Power Gains
While individual results may vary, here are some typical power gains:
- Increase of 50-100 horsepower.
- Improved throttle response and acceleration.
- Higher torque output across the RPM range.
Installation Tips
Installing a Walbro 450 fuel pump and larger injectors can be done as a DIY project, but here are some tips to ensure success:
- Follow manufacturer instructions carefully.
- Ensure all connections are secure to prevent leaks.
- Consider using a fuel pressure regulator for optimal performance.
Conclusion
Upgrading the fuel system in a B58 M240i with a Walbro 450 fuel pump and larger injectors is a highly effective way to increase power and performance. These modifications not only enhance the engine’s capabilities but also improve its reliability under demanding conditions. For those looking to unleash the full potential of their M240i, these upgrades are a worthwhile investment.