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The Mazda RX-7, particularly the turbocharged models equipped with the 13B rotary engine, has garnered a reputation for its lightweight design and impressive performance. Enthusiasts often seek ways to enhance the power output of their vehicles, and porting the engine is one of the most effective methods. In this article, we will explore the best 13B porting techniques that can boost power by as much as 60 horsepower.
Understanding 13B Porting
Porting involves modifying the engine’s intake and exhaust ports to improve airflow, enhance combustion efficiency, and ultimately increase power. The 13B engine, with its unique rotary design, benefits significantly from these modifications.
Types of Porting Techniques
- Street Porting
- Bridge Porting
- Race Porting
- Peripheral Porting
Street Porting
Street porting is designed for daily drivers, focusing on improving low to mid-range torque while still providing a noticeable increase in power. This technique balances performance and drivability.
Bridge Porting
Bridge porting is more aggressive, allowing for higher RPMs and improved high-end power. This method creates a bridge in the port, which enhances flow but may sacrifice some low-end torque.
Race Porting
Race porting is the most extreme option, aimed at maximizing airflow for track use. This technique significantly boosts horsepower but compromises streetability due to reduced low-end torque.
Peripheral Porting
Peripheral porting involves relocating the intake ports to the side of the engine, providing a substantial increase in airflow. This method is typically reserved for race applications.
Choosing the Right Porting Technique
When selecting a porting technique, consider your driving style and goals. If you plan to use your RX-7 as a daily driver, street porting may be the best option. For those who frequent the track, bridge or race porting could be more suitable.
Additional Modifications to Maximize Power
While porting is crucial, combining it with other modifications can yield even greater power gains. Here are some recommended upgrades:
- Upgraded Turbocharger
- High-Performance Intercooler
- Aftermarket Exhaust System
- ECU Remapping
Upgraded Turbocharger
Installing a larger turbocharger can significantly increase boost pressure and airflow, complementing the effects of porting.
High-Performance Intercooler
A high-performance intercooler helps reduce intake temperatures, allowing for denser air and improved combustion efficiency.
Aftermarket Exhaust System
Upgrading to a high-flow exhaust system minimizes back pressure, enhancing engine efficiency and power output.
ECU Remapping
Remapping the ECU allows for optimal tuning of fuel and ignition timing, maximizing the benefits of all modifications.
Conclusion
Porting the 13B engine in your turbocharged RX-7 can lead to impressive power gains, especially when combined with other performance modifications. By understanding the different porting techniques and selecting the right combination of upgrades, you can achieve a significant boost in horsepower and driving excitement.