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The Mazda RX-7 is renowned for its lightweight design and exceptional handling, but many enthusiasts are now turning to LS swaps to achieve higher horsepower goals. Achieving 700+ horsepower in an RX-7 with an LS swap requires careful planning, the right components, and expert tuning. This article explores the best dyno-tuned setups and supporting modifications to help you reach that coveted 700+ HP mark.
Understanding the LS Swap
The LS engine, known for its reliability and performance, is a popular choice for swapping into the RX-7. With various displacements and configurations, it can easily be modified to meet extreme horsepower goals. Key factors in a successful LS swap include engine selection, mounting solutions, and drivetrain compatibility.
Choosing the Right LS Engine
When selecting an LS engine for your RX-7, consider the following options:
- LS1: A solid choice for a budget build, capable of producing 400+ HP with basic mods.
- LS3: Offers more power out of the box, with potential for over 500 HP with tuning and intake upgrades.
- LS7: The high-performance option, it can easily support 700+ HP with minimal modifications.
Essential Supporting Mods
To achieve 700+ HP, the engine alone isn’t enough. Supporting modifications are essential for maximizing performance and reliability. Here are some critical upgrades to consider:
- High-Performance Intake and Exhaust: Upgrading to a long tube header and a high-flow intake system can significantly improve airflow.
- Fuel System Upgrades: Ensure your fuel system can handle the increased demand with high-flow injectors and a larger fuel pump.
- Forced Induction: Adding a supercharger or turbocharger can push your horsepower beyond 700 HP.
- Engine Management: A quality standalone ECU or tuning software is crucial for optimizing performance and reliability.
Best Dyno-Tuned Setups
Dyno tuning is essential for extracting maximum performance from your setup. Here are some of the best dyno-tuned setups that have proven effective in achieving over 700 HP in an RX-7 LS swap:
- Setup 1: LS3 with a ProCharger Supercharger, long tube headers, and a custom tune – achieving 750 HP.
- Setup 2: LS7 with twin turbo setup, upgraded fuel system, and precision tuning – reaching 800 HP.
- Setup 3: LS1 with a nitrous system, high-performance camshaft, and optimized ECU settings – hitting 720 HP.
Drivetrain Compatibility
When swapping an LS engine into an RX-7, it’s crucial to consider the drivetrain components. The stock RX-7 transmission may not handle the increased power, so upgrades are often necessary. Here are some recommendations:
- Transmission: Consider upgrading to a T56 or a TH400 for better power handling and reliability.
- Driveshaft: A custom driveshaft is often required to accommodate the new engine and transmission setup.
- Differential: Upgrading to a stronger rear end, like the Ford 8.8, can provide the durability needed for high horsepower applications.
Cooling Solutions
High horsepower builds generate significant heat, making an effective cooling system essential. Consider these upgrades:
- Radiator: A larger, high-performance radiator will help manage engine temperatures.
- Oil Cooler: An external oil cooler can help maintain optimal oil temperatures during aggressive driving.
- Intercooler: If using forced induction, a quality intercooler is vital for reducing intake temperatures.
Tuning and Final Adjustments
After all modifications are complete, professional tuning is necessary to ensure your RX-7 runs efficiently and reliably. A skilled tuner will optimize air-fuel ratios, ignition timing, and boost levels to maximize performance while ensuring engine longevity.
Conclusion
Achieving 700+ HP in an RX-7 LS swap is an ambitious goal, but with the right components and careful tuning, it is entirely feasible. By selecting the appropriate engine, implementing supporting modifications, and ensuring proper tuning, you can create a powerful and reliable performance machine that stands out on the road or track.