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The FC RX-7 is a beloved platform for car enthusiasts, especially those looking to achieve impressive horsepower without breaking the bank. With its lightweight design and rotary engine, the RX-7 has the potential to reach over 400 horsepower with the right modifications. This guide will outline the steps necessary to turbocharge your FC RX-7 and optimize its intake system for maximum performance.
Understanding the FC RX-7 Rotary Engine
The FC RX-7 is equipped with a 1.3-liter rotary engine, known for its unique design and high-revving capabilities. Understanding how this engine works is crucial for making effective modifications. Key components include:
- Rotors: The heart of the rotary engine, responsible for generating power.
- Housing: Contains the rotors and is crucial for maintaining compression.
- Exhaust System: Affects back pressure and overall engine efficiency.
Step 1: Upgrading the Turbocharger
One of the most effective ways to increase horsepower in the FC RX-7 is by upgrading the turbocharger. A larger turbo will allow for more air to enter the engine, which is essential for producing more power. Consider the following options:
- Garrett GT28: A popular choice for those seeking a balance between performance and cost.
- Holset HX35: Known for its durability and ability to support high horsepower.
- Precision 5858: Offers excellent spool characteristics and power potential.
Step 2: Upgrading the Intake System
The intake system is crucial for ensuring that your engine receives enough air to support increased horsepower. Upgrading the intake components can significantly improve airflow and performance.
Intake Manifold
Consider upgrading to a performance intake manifold designed for higher airflow. Options include:
- FC3S Performance Manifold: Provides improved airflow and throttle response.
- Custom Fabricated Manifold: Tailored to your specific setup for optimal performance.
Air Filter
Replacing the stock air filter with a high-flow aftermarket filter can enhance airflow into the engine. Look for options like:
- K&N Filter: Known for its excellent filtration and airflow characteristics.
- AEM Dryflow: Offers high performance without the need for oiling.
Step 3: Fuel System Upgrades
To support increased horsepower, you will need to upgrade your fuel system. This includes the fuel pump, injectors, and fuel pressure regulator.
Fuel Pump
A higher-flow fuel pump will ensure that your engine receives adequate fuel under high boost conditions. Options include:
- Walbro 255lph: A popular choice for many performance builds.
- DeatschWerks DW200: Known for reliability and performance.
Fuel Injectors
Upgrading to larger fuel injectors will allow for more fuel delivery to match the increased airflow. Recommended sizes include:
- RX-8 Injectors: A direct fit upgrade that offers higher flow rates.
- RC Engineering 550cc: Ideal for those pushing for higher horsepower.
Step 4: Exhaust System Modifications
An efficient exhaust system is vital for maximizing performance. Reducing back pressure will help your engine breathe better, leading to increased horsepower.
Cat-Back Exhaust System
Installing a cat-back exhaust system will improve exhaust flow and sound. Look for systems that offer:
- MagnaFlow: Known for its deep tone and performance gains.
- HKS Hi-Power: Offers lightweight construction and excellent flow characteristics.
Downpipe
A high-flow downpipe is essential for reducing restrictions in the exhaust system. Consider these options:
- V-Maxx Downpipe: Offers a great balance of performance and price.
- Racepipe: Designed for maximum flow and performance gains.
Step 5: Tuning for Performance
After completing the modifications, it’s crucial to tune your FC RX-7 to ensure all components work harmoniously. A proper tune will maximize horsepower and ensure reliability. Consider these tuning options:
- ECU Reflash: A cost-effective way to adjust fuel maps and timing.
- Standalone ECU: Offers advanced tuning capabilities for serious builds.
Final Thoughts
Achieving 400+ horsepower in your FC RX-7 on a budget is entirely possible with the right modifications. By upgrading the turbocharger, intake system, fuel system, exhaust, and tuning, you can unlock the full potential of your rotary engine. Always remember to take your time with each step and consult with professionals when necessary for the best results.