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The Miata has long been celebrated for its lightweight chassis and exceptional handling. However, when you decide to swap in a powerful LS engine, particularly one that produces around 550 horsepower, it becomes essential to upgrade the transmission and drivetrain components to handle the increased power and torque. This article will explore the necessary upgrades and considerations for a successful LS conversion in a Miata.
Understanding the LS Engine Swap
Swapping an LS engine into a Miata is a popular modification among automotive enthusiasts. The LS engine is known for its reliability, power potential, and aftermarket support. However, the stock Miata drivetrain is not equipped to handle the immense power generated by a 550 hp LS engine. Therefore, upgrading the transmission and drivetrain is crucial for both performance and safety.
Choosing the Right Transmission
One of the first components that require upgrading is the transmission. The stock Miata transmission is not designed for the torque produced by an LS engine. Here are some popular transmission options:
- T56 Transmission: This six-speed manual transmission is a popular choice for LS swaps due to its strength and availability. It can handle high horsepower and torque levels, making it ideal for a 550 hp setup.
- TR6060 Transmission: Similar to the T56, the TR6060 is another robust option. It features improved gear ratios and is commonly found in higher performance vehicles.
- 4L60E/4L80E Transmission: For those preferring an automatic option, the 4L60E and 4L80E are both capable of handling the power of an LS engine. They offer smooth shifting and are widely used in performance builds.
Drivetrain Upgrades
In addition to the transmission, several other drivetrain components must be upgraded to ensure reliability and performance:
- Driveshaft: A custom driveshaft is necessary to connect the new transmission to the rear differential. Ensure it is made from high-strength materials to handle increased power.
- Rear Differential: The stock Miata differential may not withstand the power of an LS engine. Consider upgrading to a stronger differential, such as a Ford 8.8 or a Mazda RX-7 rear end.
- Axles: Upgraded axles are essential to handle the increased torque. Look for heavy-duty axles specifically designed for high horsepower applications.
Engine Mounts and Transmission Mounts
Proper engine and transmission mounts are critical for a successful LS swap. The stock Miata mounts will not support the weight and torque of an LS engine. Consider the following options:
- Aftermarket Engine Mounts: Several companies offer aftermarket engine mount kits specifically designed for LS swaps in Miatas. These mounts help to position the engine correctly and reduce vibrations.
- Transmission Mounts: A custom transmission mount will be necessary to secure the new transmission in place. Ensure it is designed to handle the torque produced by the LS engine.
Cooling System Considerations
With the increased power output, an upgraded cooling system is vital to prevent overheating. Consider the following upgrades:
- Radiator: A larger, high-performance radiator will help dissipate heat more effectively. Look for a radiator designed for LS swaps to ensure proper fitment.
- Cooling Fans: Upgraded electric cooling fans can provide better airflow and cooling efficiency, especially during high-performance driving.
Final Considerations
Upgrading the transmission and drivetrain for a 550 hp Miata LS conversion is a complex but rewarding process. It requires careful planning and the right components to ensure reliability and performance. Before starting your build, consider consulting with professionals or experienced enthusiasts to avoid common pitfalls. With the right upgrades, your Miata can become a true powerhouse, delivering thrilling performance on the road and track.