Building a 400+ Hp Gd Wrx: Essential Mods for Track-ready Performance

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The Subaru WRX has earned its reputation as a performance icon, particularly the GD generation known for its rally heritage. To transform a GD WRX into a track-ready beast with over 400 horsepower, a combination of essential modifications is required. This article outlines the key upgrades that will enhance performance, handling, and reliability.

Engine Upgrades

To achieve 400+ horsepower, the heart of your WRX—the engine—needs significant upgrades. Here are the primary modifications to consider:

  • Turbocharger Upgrade: A larger turbocharger, such as a Garrett or BorgWarner unit, can significantly increase airflow and power.
  • ECU Tuning: A proper tune is essential to maximize the potential of your upgraded turbo and other modifications.
  • Intercooler Upgrade: A high-performance intercooler helps reduce intake temperatures, improving efficiency and power.
  • Intake and Exhaust: Upgrading to a high-flow intake and exhaust system enhances airflow and engine response.
  • Fuel System Upgrade: High-flow fuel injectors and a fuel pump ensure that your engine receives the necessary fuel for increased power.

Transmission and Drivetrain Enhancements

To handle the increased power, your transmission and drivetrain must be robust enough to manage the additional stress:

  • Clutch Upgrade: A performance clutch will provide better grip and withstand the added power during aggressive driving.
  • Short Shifter: A short-throw shifter improves gear changes for a more engaging driving experience.
  • Differential Upgrades: Consider upgrading to a limited-slip differential for improved traction during cornering.
  • Driveshaft Upgrade: A lightweight driveshaft can reduce rotational mass and improve responsiveness.

Suspension Modifications

To ensure your WRX handles beautifully on the track, suspension modifications are crucial:

  • Coilover Suspension: Adjustable coilovers allow you to fine-tune ride height and damping for optimal track performance.
  • Anti-Roll Bars: Upgrading to stiffer anti-roll bars reduces body roll and enhances cornering stability.
  • Strut Braces: Adding front and rear strut braces increases chassis rigidity, improving handling responsiveness.
  • Alignment Settings: Proper alignment settings, including camber and toe adjustments, can significantly enhance cornering performance.

Braking System Enhancements

With increased power and speed, a robust braking system is essential for safety and performance:

  • Big Brake Kit: Upgrading to a big brake kit provides larger rotors and calipers for improved stopping power.
  • Performance Brake Pads: High-performance pads offer better bite and fade resistance during track sessions.
  • Stainless Steel Brake Lines: Upgrading to stainless steel lines improves pedal feel and reduces brake line expansion.
  • Brake Fluid: Use high-temperature brake fluid to prevent fade during intense driving.

Weight Reduction Strategies

Reducing weight can significantly enhance performance and handling. Consider these strategies:

  • Remove Unnecessary Components: Strip out items like the rear seats, spare tire, and sound deadening materials.
  • Lightweight Wheels: Investing in lightweight wheels reduces unsprung weight and improves acceleration and handling.
  • Carbon Fiber Parts: Consider replacing heavy components with carbon fiber alternatives, such as hoods and trunk lids.

Track Preparation and Maintenance

Once your modifications are complete, proper track preparation and maintenance are crucial for performance:

  • Regular Inspections: Before hitting the track, conduct thorough inspections of all systems, including engine, transmission, and brakes.
  • Fluid Changes: Regularly change engine oil, transmission fluid, and brake fluid to ensure optimal performance.
  • Tire Selection: Choose tires that are suited for track use, providing the necessary grip and performance.
  • Track Day Preparation: Familiarize yourself with the track layout and conditions before your first session.

Conclusion

Building a 400+ HP GD WRX for track-ready performance requires careful planning and execution. By focusing on engine upgrades, drivetrain enhancements, suspension modifications, braking improvements, and weight reduction, you can create a formidable track machine. With the right preparation and maintenance, your WRX will not only be powerful but also reliable and enjoyable on the track.