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The SR20DET engine is a popular choice among car enthusiasts and tuners, particularly in the Nissan community. One of the most significant upgrades for this engine is the turbocharger, which can dramatically increase power output. However, not all turbochargers are created equal, and one of the critical factors that influence the performance of a turbo is the size of the compressor wheel. This article delves into the impact of compressor wheel size on SR20DET turbo upgrade power gains.
Understanding Compressor Wheel Size
The compressor wheel is a vital component of a turbocharger, responsible for compressing the intake air before it enters the engine. The size of the compressor wheel can significantly affect the turbocharger’s efficiency and the overall performance of the engine. A larger compressor wheel can move more air, which can lead to increased power, but it also comes with trade-offs.
Effects of Compressor Wheel Size on Power Gains
When upgrading the turbocharger on an SR20DET, the size of the compressor wheel can influence several performance characteristics:
- Airflow Capacity: Larger compressor wheels can move more air, which can lead to higher horsepower and torque figures.
- Boost Threshold: A larger wheel may take longer to spool up, affecting low-end power delivery.
- Efficiency: The efficiency of the compressor can vary with size, impacting how effectively the turbocharger converts exhaust energy into usable power.
- Turbo Lag: Increased size can lead to more turbo lag, requiring careful tuning to manage throttle response.
Choosing the Right Compressor Wheel Size
Choosing the appropriate compressor wheel size for an SR20DET turbo upgrade involves balancing power goals with driving characteristics. Here are some considerations:
- Power Goals: Determine the desired horsepower and torque figures to guide the size selection.
- Driving Style: Consider whether the vehicle will be used for daily driving, track use, or a combination of both.
- Tuning Options: Ensure that the engine management system can support the new turbo and its characteristics.
- Supporting Modifications: Upgrading the fuel system, intercooler, and exhaust can help maximize the benefits of a larger compressor wheel.
Common Compressor Wheel Sizes for SR20DET Upgrades
Various turbocharger models are available for the SR20DET, each with different compressor wheel sizes. Here are some common options:
- Garrett GT28RS: Features a compressor wheel size of approximately 60mm, known for quick spool and good mid-range power.
- Garrett GT2871R: Offers a 71mm compressor wheel, providing higher airflow and power potential for more aggressive builds.
- Holset HX35: Comes with a larger compressor wheel, suitable for high horsepower applications.
- Precision 6266: With a 66mm compressor wheel, this turbo is popular for those seeking significant power gains.
Real-World Power Gains
Many SR20DET owners have reported varying power gains based on the compressor wheel size chosen for their turbo upgrade. Here are some examples:
- GT28RS Upgrade: Owners have seen gains of 50-100 horsepower over stock configurations.
- GT2871R Upgrade: This turbo can yield power gains upwards of 100-150 horsepower with proper tuning.
- Precision 6266 Upgrade: High-performance builds have reported gains of 200+ horsepower with supporting modifications.
Conclusion
The size of the compressor wheel plays a crucial role in determining the power gains from an SR20DET turbo upgrade. While larger wheels can provide significant horsepower increases, they can also introduce challenges such as turbo lag and tuning complexity. It is essential to consider your performance goals, driving style, and supporting modifications when selecting the right compressor wheel size for your turbo upgrade.
Ultimately, the right choice will enhance your driving experience and unlock the full potential of your SR20DET engine.