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The Mazda 13B-REW engine is a legendary powerplant known for its unique rotary design and impressive performance capabilities. For enthusiasts looking to push the limits, building a 13B-REW to achieve over 400 wheel horsepower (WHP) is an exciting challenge. In this article, we will explore the essential components and modifications necessary to reach this power goal while ensuring reliability and performance.
Understanding the 13B-REW Engine
The 13B-REW is a 1.3-liter rotary engine that features a unique Wankel design. It is known for its lightweight construction and high-revving capabilities. Before diving into the build process, it’s crucial to understand the engine’s specifications and characteristics, as this knowledge will guide your modifications.
- Displacement: 1.3 liters
- Configuration: Twin rotor rotary
- Stock horsepower: Approximately 280 WHP
- Redline: 8,000 RPM
Key Components for a 400+ WHP Build
To achieve 400+ WHP, several critical components must be upgraded or replaced. Below is a list of essential modifications that will help you reach your power goals.
- Forged Internals: Upgrading to forged rotors, apex seals, and side seals will enhance durability and allow for higher boost levels.
- Aftermarket Turbocharger: A larger turbocharger will significantly increase airflow and boost pressure, essential for achieving high horsepower.
- Upgraded Fuel System: High-flow fuel injectors and a performance fuel pump are necessary to meet the increased fuel demands.
- Intercooler: An efficient intercooler will help lower intake temperatures, improving performance and reliability.
- ECU Tuning: A standalone or reflashed ECU will optimize fuel and ignition maps for the new setup.
Forged Internals: The Foundation of Power
Forged internals are crucial for building a reliable and powerful 13B-REW. Stock components can handle moderate power levels, but for sustained performance over 400 WHP, upgrading to forged parts is essential.
- Forged Rotors: Manufactured from high-strength materials, forged rotors can withstand higher RPMs and boost levels.
- Apex Seals: Upgrading to stronger apex seals will prevent blow-by and ensure proper sealing under boost.
- Side Seals: High-performance side seals will enhance reliability and longevity of the engine.
Choosing the Right Turbocharger
The turbocharger is one of the most critical components in achieving high horsepower. Selecting the right turbo involves balancing between boost response and maximum power output.
- Turbo Size: A larger turbo will produce more power but may have a slower spool time. Consider a twin-scroll turbo for better response.
- Boost Levels: Aim for a boost level between 15-20 PSI for optimal performance without risking engine failure.
- Turbo Placement: Proper placement and piping will ensure minimal turbo lag and efficient airflow.
Upgrading the Fuel System
With increased power comes the need for a robust fuel system. Upgrading your fuel injectors and pump is essential to support the higher fuel demands of a 400+ WHP build.
- Fuel Injectors: Consider 1000cc or larger injectors to ensure adequate fuel delivery.
- Fuel Pump: A high-flow fuel pump will maintain the necessary pressure and flow rate under boost conditions.
- Fuel Pressure Regulator: An adjustable regulator will allow for fine-tuning fuel pressure for optimal performance.
Intercooling: Keeping Temperatures in Check
Heat management is critical in performance builds. An aftermarket intercooler will help lower intake temperatures, improving performance and preventing detonation.
- Core Size: A larger core will provide better cooling efficiency, resulting in denser air entering the engine.
- Piping: Use smooth, high-flow piping to minimize restrictions and maximize airflow.
- Placement: Ensure the intercooler is positioned for optimal airflow, avoiding heat soak from the engine.
ECU Tuning: Maximizing Performance
After upgrading the engine components, it’s essential to tune the ECU to optimize performance. Proper tuning will ensure that the engine runs efficiently and reliably at high power levels.
- Standalone ECU: Consider a standalone ECU for complete control over fuel and ignition maps.
- Dyno Tuning: A professional dyno tune will provide the most accurate adjustments for your specific setup.
- Monitoring: Use gauges to monitor vital parameters such as air-fuel ratio, boost pressure, and engine temperature.
Conclusion: Building Your 13B-REW for 400+ WHP
Building a Mazda 13B-REW to achieve over 400 WHP is an ambitious but rewarding project. By investing in forged internals, selecting the right turbocharger, upgrading your fuel system, and tuning your ECU, you can create a reliable and powerful rotary engine that delivers thrilling performance. With careful planning and execution, your 13B-REW can become a true powerhouse on the road or track.