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The RX-7 is a beloved sports car known for its lightweight design and agile handling. However, when it comes to swapping in a powerful LS engine, several modifications to the transmission and drivetrain are essential to ensure a smooth and efficient power transfer. This article explores the necessary supporting mods to make your RX-7 LS swap a success.
Understanding the RX-7 LS Swap
The LS engine is a popular choice for RX-7 enthusiasts due to its power and reliability. However, integrating this engine into the RX-7 requires careful consideration of the transmission and drivetrain components to handle the increased torque and horsepower.
Transmission Options for LS Swaps
Choosing the right transmission is crucial for an RX-7 LS swap. Here are some popular options:
- T56 Manual Transmission: Known for its strength and smooth shifting, the T56 is a favorite among performance enthusiasts.
- 4L60E Automatic Transmission: This automatic transmission provides a good balance of performance and ease of use, making it a great choice for daily drivers.
- TR6060 Transmission: An upgrade from the T56, the TR6060 offers even more durability, making it suitable for high-powered builds.
Drivetrain Modifications
In addition to the transmission, the drivetrain must be modified to accommodate the new powertrain. Consider the following components:
- Driveshaft: A custom driveshaft may be necessary to connect the LS engine to the RX-7 rear end. Ensure it is balanced and rated for the power output.
- Rear Differential: Upgrading to a stronger differential, such as a Ford 8.8 or a custom-built unit, can handle the increased torque from the LS engine.
- Axles: Consider upgrading to stronger axles to prevent breakage under heavy loads. Aftermarket options are available that offer improved strength and reliability.
Engine Mounts and Crossmembers
Proper engine mounts and crossmembers are essential for securing the LS engine in the RX-7. Here are some options:
- Custom Engine Mounts: Many enthusiasts opt for custom engine mounts to fit the LS engine perfectly within the RX-7 chassis.
- Aftermarket Kits: Several companies offer bolt-in engine mount kits specifically designed for LS swaps in RX-7s.
Cooling System Upgrades
With the increased power output of the LS engine, a robust cooling system is necessary to prevent overheating. Consider these upgrades:
- Radiator: A larger, high-performance radiator can help dissipate heat more effectively, especially during spirited driving.
- Cooling Fans: Upgrading to high CFM electric fans can improve airflow through the radiator, enhancing cooling efficiency.
Fuel System Modifications
To support the LS engine’s fuel demands, modifications to the fuel system are necessary:
- Fuel Pump: Upgrading to a high-flow fuel pump ensures adequate fuel delivery to the engine.
- Fuel Injectors: Consider larger injectors to accommodate the increased fuel requirements of the LS engine.
Final Thoughts
Swapping an LS engine into an RX-7 can provide a thrilling driving experience, but it requires careful planning and execution. By focusing on supporting transmission and drivetrain modifications, you can ensure a smooth power transfer and enhance the overall performance of your vehicle. With the right upgrades, your RX-7 will not only handle the power of the LS engine but also maintain its legendary agility and responsiveness.