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The 13B-REW and 13B-REW+ engines are iconic components of the Mazda rotary engine family, known for their unique design and performance capabilities. Understanding the differences between these two variants can help enthusiasts and potential buyers make informed decisions regarding upgrades and modifications.
Overview of the 13B-REW Engine
The 13B-REW engine is a part of Mazda’s renowned Wankel rotary engine series, specifically designed for the RX-7 models produced in the 1990s. This engine features a lightweight design, compact size, and a unique rotary combustion process that allows for high RPMs and impressive power output.
Key Specifications of the 13B-REW
- Displacement: 1.3 liters
- Power Output: Approximately 240 HP
- Torque: 217 lb-ft
- Weight: Around 200 lbs
Introduction to the 13B-REW+
The 13B-REW+ is an upgraded version of the original 13B-REW engine, offering enhanced performance and reliability. This variant incorporates several modifications that increase horsepower and torque, making it a popular choice among car enthusiasts looking for more power from their rotary engines.
Key Specifications of the 13B-REW+
- Displacement: 1.3 liters
- Power Output: Approximately 290-320 HP
- Torque: 240 lb-ft
- Weight: Similar to the 13B-REW
Performance Upgrades: Adding 50-80 HP
Upgrading from the 13B-REW to the 13B-REW+ can yield significant gains in horsepower. Here are some common upgrades that contribute to this increase:
- Turbocharger Upgrades: Replacing the stock turbo with a larger unit can dramatically increase airflow and boost, resulting in higher power output.
- ECU Tuning: Optimizing the engine’s electronic control unit can enhance fuel mapping and ignition timing, leading to better performance.
- Exhaust System Upgrades: High-performance exhaust components can reduce back pressure and improve exhaust flow, contributing to increased horsepower.
- Intercooler Enhancements: Upgrading the intercooler can help manage intake temperatures, allowing for more efficient combustion and power gains.
- Intake Modifications: A better intake system can improve airflow into the engine, boosting overall performance.
Comparison of Performance Enhancements
When comparing the performance enhancements of the 13B-REW and 13B-REW+, several factors come into play:
- Base Power Output: The 13B-REW starts at a lower baseline of 240 HP compared to the 13B-REW+, which can reach up to 320 HP with modifications.
- Upgrade Potential: The 13B-REW+ has more room for performance upgrades, allowing for a greater overall power increase.
- Reliability: The 13B-REW+ is generally considered more reliable under higher power outputs due to its enhanced components.
Conclusion
In summary, the 13B-REW and 13B-REW+ engines represent two distinct approaches to rotary engine performance. While the 13B-REW offers a solid foundation, the 13B-REW+ provides significant upgrades that can add 50-80 HP through various modifications. Enthusiasts looking to maximize their rotary engine’s potential should consider these differences when planning upgrades.