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The RX-7 is a legendary sports car known for its lightweight design and exceptional handling. However, many enthusiasts seek to enhance its performance by swapping in a more powerful engine. One popular choice is the LS engine, which can easily exceed 600 horsepower. In this article, we will explore the best engine options for an RX-7 LS swap and provide tuning tips to help you achieve optimal performance.
Why Choose an LS Engine?
The LS engine family, originating from General Motors, is renowned for its power, reliability, and aftermarket support. Here are several reasons why LS engines are a popular choice for RX-7 swaps:
- Power Potential: LS engines can easily produce over 600 horsepower with the right modifications.
- Weight: LS engines are relatively lightweight, helping maintain the RX-7’s balanced handling.
- Aftermarket Support: A vast array of performance parts and tuning options are available.
- Reliability: LS engines are known for their durability and can handle high horsepower without frequent issues.
Choosing the Right LS Engine
When selecting an LS engine for your RX-7, consider the following options:
- LS1: The LS1 is a great starting point, producing around 350-400 horsepower. With modifications, it can easily reach 600+ horsepower.
- LS2: Slightly more powerful than the LS1, the LS2 offers around 400-450 horsepower and is a popular choice for swaps.
- LS3: The LS3 comes with 430-480 horsepower stock and is an excellent choice for those looking for more power right out of the box.
- LS7: The LS7 is a high-performance engine that produces over 500 horsepower, making it a top-tier choice for extreme builds.
Essential Components for the Swap
To successfully swap an LS engine into an RX-7, you will need several key components:
- Engine Mounts: Custom engine mounts are necessary to fit the LS engine in the RX-7’s engine bay.
- Transmission: An LS-compatible transmission, such as the T56, is recommended for handling increased power.
- Wiring Harness: A standalone wiring harness or an LS swap-specific harness is essential for proper engine management.
- Exhaust System: Custom exhaust headers and a complete exhaust system will be needed to accommodate the LS engine.
- Cooling System: An upgraded radiator and cooling system are crucial to manage the increased heat output.
Custom Tuning Tips
Once your LS engine is installed, custom tuning is critical to achieving optimal performance. Here are some tips to consider:
- ECU Tuning: Use a quality tuning software or consult a professional tuner to adjust fuel maps, ignition timing, and other parameters.
- Dyno Testing: After tuning, dyno testing is essential to ensure your engine is performing as expected and to make further adjustments.
- Monitor Engine Parameters: Utilize gauges to monitor vital engine parameters such as air-fuel ratio, temperature, and boost levels.
- Fuel Quality: Use high-quality fuel that meets the octane requirements of your tuned engine.
Common Challenges and Solutions
While an LS swap can dramatically enhance your RX-7’s performance, several challenges may arise during the process:
- Fitment Issues: Ensure that all components, including the engine, transmission, and exhaust, fit properly without interference.
- Cooling Problems: Upgrade your cooling system to prevent overheating, especially during high-performance driving.
- Electrical Issues: Properly wire the engine to avoid electrical problems. Consider professional help if needed.
Conclusion
Building a 600+ horsepower RX-7 LS swap can be a rewarding project for car enthusiasts. With the right engine choice, components, and tuning, you can create a powerful and reliable sports car that retains the RX-7’s legendary handling characteristics. Take your time, plan carefully, and enjoy the journey of building your dream machine.