Supporting Upgrades for a 700+ Hp Miata Ls Swap: Fuel, Drivetrain, and Suspension

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The Mazda Miata is a beloved platform for car enthusiasts, known for its lightweight chassis and exceptional handling. However, when it comes to power, many enthusiasts look to upgrade their Miatas with LS swaps, particularly aiming for impressive outputs of 700+ horsepower. To support such power levels, a series of upgrades across fuel, drivetrain, and suspension is essential. This article will delve into the necessary supporting upgrades for a 700+ HP Miata LS swap.

Fuel System Upgrades

When swapping an LS engine into a Miata, the stock fuel system will not suffice to support the increased horsepower. Upgrading the fuel system is critical for ensuring that the engine receives adequate fuel supply under high-performance conditions.

  • Fuel Pump: Upgrading to a high-flow electric fuel pump is essential. Look for pumps that can deliver sufficient pressure and volume to support 700+ HP.
  • Fuel Injectors: Larger fuel injectors are necessary to accommodate the increased fuel demands. Consider injectors rated for at least 1000cc/min.
  • Fuel Lines: Replace the factory fuel lines with larger diameter lines to reduce restrictions and ensure adequate fuel delivery.
  • Fuel Pressure Regulator: An adjustable fuel pressure regulator allows for fine-tuning the fuel pressure to match the engine’s requirements.
  • Fuel Rail: Upgrading to an aftermarket fuel rail can provide better fuel distribution and support higher fuel flow rates.

Drivetrain Upgrades

The drivetrain is another critical area that requires attention when upgrading to a 700+ HP setup. The stock Miata drivetrain components are not designed to handle such power levels, making it necessary to invest in stronger parts.

  • Transmission: Consider swapping in a stronger transmission, such as a T56 or a TR6060, which can handle the torque produced by an LS engine.
  • Clutch: A high-performance clutch is essential for managing the increased power. Look for clutches designed for high torque applications.
  • Driveshaft: Upgrading to a stronger driveshaft, preferably a one-piece aluminum or carbon fiber unit, will reduce weight and increase strength.
  • Differential: The stock Miata differential will likely fail under high power. Upgrading to a limited-slip differential (LSD) with a higher torque rating is recommended.
  • Axles: Reinforced axles are necessary to handle the increased power and torque without failure. Look for aftermarket options designed for high horsepower applications.

Suspension Upgrades

With the added power and torque from an LS engine, it’s crucial to upgrade the suspension to maintain handling and stability. A well-balanced suspension setup will ensure that the Miata can effectively harness the power without compromising performance.

  • Coilovers: Upgrading to adjustable coilovers will allow for better handling and ride height adjustments suitable for high-performance driving.
  • Sway Bars: Upgrading to larger sway bars will reduce body roll and improve cornering stability.
  • Control Arms: Consider upgrading to stronger control arms that can handle increased stress from the additional power.
  • Bushings: Replacing stock rubber bushings with polyurethane bushings will improve responsiveness and reduce flex.
  • Brakes: Upgrading the braking system is essential. Consider larger rotors and calipers to ensure adequate stopping power.

Conclusion

Upgrading a Mazda Miata to support a 700+ HP LS swap involves significant modifications to the fuel system, drivetrain, and suspension. Each component plays a vital role in ensuring that the vehicle can handle the increased power while maintaining performance and safety. By investing in these supporting upgrades, enthusiasts can enjoy the thrilling experience of driving a high-powered Miata without compromising reliability or control.