Top Supporting Mods for a 400 Hp Miata Ls Swap: Suspension, Brakes, and Drivetrain

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The Mazda Miata is a beloved roadster known for its lightweight and nimble handling. When enthusiasts decide to swap in a powerful LS engine, achieving 400 horsepower, they must consider upgrades to the suspension, brakes, and drivetrain to handle the increased power effectively. This article explores the top supporting modifications necessary for a successful LS swap in a Miata.

Suspension Upgrades

Upgrading the suspension is crucial for a Miata with an LS engine swap. The added weight and power can significantly alter the car’s handling characteristics. Here are some essential suspension upgrades:

  • Coilover Kits: Adjustable coilovers allow for better handling and ride height adjustment. Brands like Fortune Auto and BC Racing offer kits specifically designed for Miatas.
  • Sway Bars: Upgrading to larger sway bars helps reduce body roll during cornering, improving stability. Look for options from companies like Flyin’ Miata or Racing Beat.
  • Control Arms: Upgraded control arms can improve alignment settings and enhance suspension geometry. Consider options from companies like MiataRoadster or IL Motorsport.
  • Strut Braces: Front and rear strut braces increase chassis rigidity, which can lead to better handling and response. Brands like Hard Dog and Flyin’ Miata provide excellent options.

Brake System Enhancements

With an increase in horsepower, the stock braking system may struggle to keep up. Upgrading the brakes is essential for safety and performance. Here are some recommended modifications:

  • Big Brake Kits: Upgrading to a big brake kit from companies like Wilwood or StopTech ensures that the Miata can handle the increased speed and weight effectively.
  • Brake Pads: High-performance brake pads provide better stopping power and fade resistance. Brands like Hawk and EBC offer excellent choices for spirited driving.
  • Stainless Steel Brake Lines: These lines improve brake feel and reduce expansion under pressure, leading to more consistent braking performance.
  • Brake Fluid: Upgrading to high-temperature brake fluid can prevent brake fade during intense driving sessions.

Drivetrain Modifications

The drivetrain must be capable of handling the power from the LS engine. Upgrading components will ensure reliability and performance. Here are key drivetrain modifications:

  • Transmission: Consider a stronger transmission that can handle the LS engine’s power, such as the T56 or a built Miata transmission.
  • Driveshaft: A custom driveshaft is often necessary to accommodate the LS swap, ensuring it can handle the torque and power.
  • Differential: Upgrading to a limited-slip differential (LSD) helps with traction and power delivery. Options include the OEM Miata LSD or aftermarket options from companies like Quaife.
  • Engine Mounts: High-quality engine mounts are essential to securely position the LS engine in the Miata’s engine bay. Consider options from companies like Mazdaspeed or an LS swap-specific manufacturer.

Final Thoughts

Upgrading the suspension, brakes, and drivetrain is vital for a 400 HP Miata LS swap. These modifications ensure that the car can handle the increased power while maintaining safety and performance. Each component plays a crucial role in the overall driving experience, making it essential to choose quality parts and brands that specialize in performance upgrades for the Miata.