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The Audi B5 S4 is a beloved model among enthusiasts, known for its performance and tuning potential. One of the most popular upgrades for this vehicle is the installation of a Garrett GT3071R turbocharger. This article will guide you through the steps necessary to achieve over 400 wheel horsepower (WHP) with this turbo on your B5 S4.
Understanding the Garrett GT3071R Turbo
The Garrett GT3071R turbocharger is a well-regarded option for those looking to enhance the performance of their B5 S4. It offers a balance of quick spool time and high-end power, making it ideal for both street and track applications.
- Compressor Wheel Size: 71mm
- Turbine Wheel Size: 53mm
- Flow Potential: Up to 500 WHP
Required Upgrades for Installation
To successfully achieve 400+ WHP with the GT3071R, several supporting modifications are necessary. These upgrades will ensure your engine can handle the increased power and boost levels.
- Upgraded Fuel Injectors
- High-Flow Fuel Pump
- Aftermarket Intercooler
- Upgraded Exhaust System
- ECU Tune
Upgraded Fuel Injectors
Choosing the right fuel injectors is crucial for maintaining the proper air-fuel ratio at higher power levels. Aim for injectors rated between 550cc and 750cc to support your power goals.
High-Flow Fuel Pump
A high-flow fuel pump is essential to ensure adequate fuel delivery under boost. Consider options like the Walbro 255 or similar aftermarket pumps.
Aftermarket Intercooler
Reducing intake temperatures is vital for performance. An aftermarket intercooler will help maintain lower temperatures, preventing heat soak and detonation.
Upgraded Exhaust System
A free-flowing exhaust system will reduce back pressure and improve turbo efficiency. Look for a full turbo-back exhaust system that includes high-flow catalytic converters.
ECU Tune
A proper ECU tune is critical to optimizing the performance of your new turbo setup. Consider professional tuning options to ensure safety and reliability.
Installation Process
Installing the Garrett GT3071R turbo on your B5 S4 requires mechanical knowledge and proper tools. Follow these steps for a successful installation:
- Disconnect the battery and drain the coolant.
- Remove the stock turbocharger and associated components.
- Install the new GT3071R turbocharger with proper gaskets and hardware.
- Connect the upgraded exhaust system and intercooler piping.
- Install upgraded fuel injectors and fuel pump.
- Reconnect the battery and fill the coolant.
- Upload the ECU tune and perform a test run.
Tuning for 400+ WHP
After installation, tuning is essential to achieve and maintain over 400 WHP. Work with a reputable tuner who has experience with the B5 S4 platform and the Garrett GT3071R turbo.
- Monitor air-fuel ratios during tuning.
- Adjust boost levels for optimal performance.
- Ensure ignition timing is appropriate to prevent knock.
Conclusion
Achieving 400+ WHP with a Garrett GT3071R turbo on your B5 S4 is an exciting project that requires careful planning and execution. By following the outlined steps and ensuring you have the right supporting modifications, you can enjoy a powerful and reliable performance upgrade.