Subaru WRX Turbo Upgrade Costs Explained

Subaru WRX Turbo Upgrade: Unleashing More Power

The Subaru WRX is renowned for its exhilarating performance and distinctive boxer engine rumble. For many owners, the desire to push the boundaries of this already potent machine leads them to consider a turbocharger upgrade. Whether you're looking for a subtle increase in power or a significant leap in performance, understanding the costs and options involved is crucial. This guide will break down the typical expenses and varieties of turbo upgrades available for your Subaru WRX.

Understanding Your Subaru WRX Turbo Options

When it comes to upgrading the turbocharger on your Subaru WRX, you generally have two main paths: modifying your existing factory turbocharger or opting for a completely new, often larger, unit. Each approach has its own set of advantages, disadvantages, and associated costs. It's important to consider your power goals, budget, and the overall desired character of your vehicle before making a decision.

Factory Turbocharger Upgrade Services

One cost-effective way to gain more performance is to have your original turbocharger upgraded. This typically involves modifying the existing unit with larger or more efficient components. A common service offered is the TDO4HL upgrade. This modification often includes a larger compressor wheel, such as a 50x62x65mm with a 65mm exducer and 50mm inducer, and a 45x52x9 blade turbine wheel. This type of upgrade aims to improve airflow and spool characteristics, providing a noticeable bump in power over the stock unit.

Key aspects of a factory turbo upgrade:

• Cost-Effectiveness: Generally less expensive than a brand-new, larger turbo.
• Core Charge: You will typically need to provide your existing turbocharger as a core for the upgrade service. Failure to do so may incur an additional charge.
• Performance Gains: Offers a good balance of improved power without requiring extensive supporting modifications.
• Example Pricing: A TDO4HL upgrade service, which includes the specified wheel sizes, can often be found for around $550.

Brand New, Larger Turbocharger Options

For those seeking more substantial power gains, investing in a brand-new, larger turbocharger is the way to go. These units are designed from the ground up to flow more air and support higher horsepower figures. Subaru WRX models, along with the Legacy GT, often benefit from a range of upgraded turbo sizes, commonly designated by numbers like 16g, 18g, 20g, and even larger TDO6-series turbos.

Common Larger Turbo Sizes and Their Capabilities

The following table outlines some popular larger turbocharger options, their specifications, and estimated horsepower capabilities. It's crucial to remember that these are estimates, and actual horsepower figures can vary depending on supporting modifications, tuning, fuel, and the specific engine configuration.

Important Considerations for Brand New Turbos:

• No Core Required: For these larger, newly built units, you do not need to provide a core turbo.
• Wastegate Options: You can typically choose between a unit without a wastegate actuator or one configured for an internal wastegate. External wastegate setups may also be available.
• Billet Compressor Wheels: Many of the higher-end options feature billet compressor wheels, which are stronger, lighter, and more durable than cast wheels, allowing for higher boost pressures and improved efficiency.

Turbine Wheel Upgrade Options

In addition to the compressor side of the turbo, the turbine wheel also plays a significant role in performance. Upgrading the turbine wheel can improve exhaust flow, reduce backpressure, and enhance the turbo's responsiveness. Here are some common turbine wheel upgrade options:

• TDO5H: 49mm x 56mm, available with 12 or 9 blades.
• TDO6SL2: 54mm x 61mm, available with 11 or 9 blades.
• TDO6: 55mm x 65mm, typically a 12-blade design.
• TDO6H: 58.8mm x 67.2mm, available with 11, 9 blade unclipped, or 9 blade clipped options. The 9-blade options (clipped or unclipped) are often recommended due to being approximately 100 grams lighter than the 11-blade version, potentially leading to quicker spool.

Factors Affecting Turbo Upgrade Costs

While the prices listed provide a good starting point, several factors can influence the final cost of your Subaru WRX turbo upgrade:

• Specific Turbocharger Chosen: Larger, more advanced turbos with billet wheels and premium materials will naturally cost more.
• Brand and Manufacturer: Reputable turbocharger brands often come with a higher price tag, reflecting their quality and performance.
• Additional Supporting Modifications: While not directly part of the turbo cost, you will likely need other modifications to effectively utilise a larger turbo. These can include:
• Fuel Injectors: Larger injectors are often necessary to supply adequate fuel for increased airflow.
• Fuel Pump: An upgraded fuel pump may be required to maintain fuel pressure.
• Exhaust System: A less restrictive exhaust, including a downpipe, is crucial for optimal turbo performance.
• Intercooler: An upgraded intercooler helps to cool the charged air, increasing density and power.
• Tuning: Professional ECU tuning is essential to properly calibrate the engine for the new turbocharger and supporting modifications.
• Installation Costs: If you're not performing the installation yourself, factor in the labour costs from a qualified mechanic.
• Wastegate Type: Turbos set up for external wastegates or with specific actuator options might have different pricing.

Frequently Asked Questions (FAQs)

Q1: Do I need to upgrade anything else when I upgrade my WRX turbo?

A1: Yes, it is highly recommended to upgrade supporting components such as fuel injectors, fuel pump, exhaust system, and to get a proper ECU tune to ensure reliability and optimal performance. The extent of these upgrades will depend on how large a turbo you install.

Q2: How much horsepower can I expect from a TDO4HL upgrade?

A2: A TDO4HL upgrade can typically add around 20-40 horsepower over a stock turbo, depending on the specific modifications and tuning.

Q3: Is a 16g turbo a good upgrade for a WRX?

A3: The 16g turbo is a popular choice for a mild to moderate power increase, often supporting around 375-400 horsepower. It offers a good balance of spool time and top-end power for many WRX owners.

Q4: What is the difference between a 9-blade and 11-blade turbine wheel?

A4: A 9-blade turbine wheel is generally lighter than an 11-blade wheel, which can lead to quicker turbocharger spool-up and improved throttle response, especially at lower RPMs. An 11-blade wheel might offer slightly better high-RPM flow in some applications.

Q5: Can I use my original downpipe with a larger turbo?

A5: In most cases, a larger turbo will require a compatible downpipe due to differences in flange size and outlet diameter. It is strongly advised to use a downpipe designed for your specific upgraded turbocharger.

Choosing the Right Turbo Upgrade for Your Subaru WRX

Selecting the correct turbo upgrade is a critical step in enhancing your Subaru WRX's performance. Whether you opt for a more affordable factory turbo modification or invest in a larger, brand-new unit, careful consideration of your power goals, budget, and the necessary supporting modifications is paramount. The pricing for these upgrades can range from around $550 for a modified factory turbo to upwards of $850 or more for larger, newly built units. Always consult with reputable tuning shops and turbo specialists to ensure you make the best choice for your specific needs and to maximise the potential of your beloved WRX.

For further inquiries or to discuss a custom turbo build for your Subaru WRX, you can reach out via email at tu*@gm***.com.

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