How to Make WRX RWD: The Ultimate Guide for Stunning Performance Upgrades!

The Subaru WRX is a legendary performance car renowned for its all-wheel drive (AWD) system, offering exceptional handling and grip. However, for some enthusiasts, the allure of rear-wheel drive (RWD) is irresistible, promising a thrilling driving experience with a focus on drifting and tail-happy antics. So, how do you transform a WRX from an AWD beast into a RWD monster? This comprehensive guide will walk you through the process, covering everything from the necessary components to the potential challenges.

The Allure of RWD: Why Convert a WRX?

The allure of RWD lies in its simplicity and inherent dynamics. Unlike AWD, which distributes power to all four wheels, RWD sends power solely to the rear axle. This setup allows for a more playful and engaging driving experience, especially when it comes to drifting and controlled oversteer.

For many enthusiasts, the ability to “throw the car around” and feel the rear end break loose is a thrilling sensation that AWD simply cannot replicate. The RWD conversion opens up a world of possibilities for drifting, track day fun, and even autocross competition, where precise control and predictability are paramount.

The Challenges of Converting a WRX to RWD

While the idea of a RWD WRX might sound exciting, the reality is that it’s a complex and challenging endeavor. The WRX was designed from the ground up as an AWD vehicle, with its engine, transmission, and suspension systems all integrated to deliver optimal performance in all weather conditions. Converting it to RWD requires significant modifications and careful planning.

Here are some of the key challenges you’ll face:

• Drivetrain Modification: The most significant challenge is modifying the drivetrain to eliminate the front differential and transfer case. This involves removing the front axle, modifying the transmission, and potentially replacing the rear differential.
• Suspension and Steering Adjustments: The suspension geometry and steering system need to be recalibrated to accommodate the shift in weight distribution and handling characteristics.
• Weight Distribution: The WRX’s original AWD setup balanced the weight distribution perfectly, but removing the front drivetrain components will shift the weight towards the rear, potentially affecting handling and stability.
• Cost and Complexity: A complete RWD conversion is a significant undertaking, requiring specialized knowledge, tools, and parts. The cost can vary considerably depending on the approach you choose and the level of customization desired.

Essential Components for a WRX RWD Conversion

A successful RWD conversion requires a combination of components, each playing a crucial role in transforming your WRX into a rear-wheel-drive machine.

• Rear Differential and Axle: You’ll need a rear differential and axle specifically designed for RWD applications. These components should be chosen based on the desired power handling capabilities and the intended use of the vehicle.
• Transmission Modification: The transmission needs to be adapted to work with the RWD setup. This might involve modifying the existing transmission or sourcing a custom-built unit designed for RWD applications.
• Custom Driveshaft: A custom driveshaft is necessary to connect the transmission to the rear differential, ensuring proper alignment and power transfer.
• Suspension and Steering Modifications: The front and rear suspension components need to be adjusted to accommodate the new weight distribution and handling characteristics. This might involve replacing springs, shocks, control arms, and even the steering rack.
• Brakes: The brake system may need to be upgraded to handle the increased braking forces and potential for wheel lock-up during aggressive driving.

Choosing the Right Approach: DIY vs. Professional Conversion

The decision to undertake a DIY RWD conversion or hire a professional team depends on your skills, resources, and budget.

DIY RWD Conversion:

• Pros:
• Cost-effective: You can save money by doing the work yourself.
• Learning Experience: It’s a rewarding experience to build your own RWD WRX from scratch.
• Customization: You have complete control over the components and modifications.
• Cons:
• Time-consuming: It requires significant time and effort.
• Technical Expertise: You need mechanical knowledge and experience.
• Potential for Errors: Mistakes can lead to costly repairs or even safety hazards.

Professional RWD Conversion:

• Pros:
• Expertise: Professional teams have the skills and knowledge to ensure a high-quality conversion.
• Efficiency: They can complete the conversion quickly and efficiently.
• Warranty: Some professionals offer warranties on their work.
• Cons:
• Costly: Professional conversions are more expensive than DIY projects.
• Limited Customization: You might have less control over the final product.

Steps Involved in a WRX RWD Conversion

Regardless of whether you choose DIY or a professional conversion, the process typically involves these steps:

1. Planning and Research: Thoroughly research the conversion process, gather necessary information, and create a detailed plan.
2. Component Sourcing: Identify and source all the required components, including the rear differential, axle, driveshaft, transmission modifications, and suspension parts.
3. Drivetrain Modification: Remove the front axle, modify the transmission, and install the rear differential and axle.
4. Suspension and Steering Adjustments: Realign the suspension to accommodate the new weight distribution and handling characteristics.
5. Braking System Evaluation: Assess the braking system and make necessary upgrades to ensure adequate braking performance.
6. Testing and Tuning: Thoroughly test the RWD conversion on a track or controlled environment, fine-tune the suspension, and adjust the alignment for optimal handling.

Beyond the Conversion: Performance Enhancements

Once you’ve successfully converted your WRX to RWD, you can further enhance its performance by:

• Engine Tuning: Optimize the engine’s performance by adjusting the ECU, installing a performance exhaust, or upgrading the intake system.
• Lightweight Components: Reduce the overall weight of the car by replacing heavy components with lighter alternatives.
• Aerodynamics: Improve the car’s aerodynamics by adding a rear spoiler or a diffuser.
• Tire Selection: Choose high-performance tires designed for drifting or track driving.

Final Thoughts: Embracing the RWD Experience

Converting a Subaru WRX to RWD is a challenging but rewarding endeavor. The journey requires careful planning, meticulous execution, and a passion for pushing the limits of automotive engineering. The end result is a unique and exhilarating driving experience, offering the thrill of controlled oversteer and the satisfaction of creating a truly one-of-a-kind performance machine.

What You Need to Learn

1. What is the cost of a WRX RWD conversion?

The cost can vary significantly based on the components used, the level of customization, and whether you DIY or hire a professional. A basic conversion can range from $5,000 to $10,000, while a more comprehensive conversion with high-performance components can easily exceed $20,000.

2. Is it legal to convert a WRX to RWD?

The legality of modifying a vehicle to RWD is subject to local regulations. It’s important to check with your state’s Department of Motor Vehicles (DMV) or local authorities to ensure your conversion complies with all applicable laws and safety standards.

3. What are the safety considerations for a WRX RWD conversion?

RWD vehicles can be more challenging to control than AWD vehicles, especially in slippery conditions. It’s crucial to understand the handling characteristics of a RWD car and to practice safe driving techniques.

4. What are the pros and cons of a RWD WRX for track driving?

A RWD WRX can be highly competitive on the track, offering precise control and the ability to drift for faster lap times. However, it may be less stable in wet conditions compared to an AWD WRX.

5. Can I convert a WRX to RWD without modifying the transmission?

It’s highly unlikely to convert a WRX to RWD without modifying the transmission. The transmission needs to be adapted to work with the RWD setup, either through modifications or by replacing it with a custom-built unit designed for RWD applications.