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When it comes to upgrading the turbocharger on a B5 Audi S4, enthusiasts often find themselves debating between two popular options: the BorgWarner EFR 7670 and the Garrett GTX3071R. Both turbos offer unique benefits and performance characteristics, making the decision challenging for builders aiming for maximum performance. This article will explore the key differences, advantages, and considerations for each turbo, helping you make an informed choice for your build.
Overview of the BorgWarner EFR 7670
The BorgWarner EFR 7670 is a highly regarded turbocharger known for its efficiency and performance. Designed with advanced technology, it features a twin-scroll turbine housing and an integrated wastegate, which contribute to its impressive spool characteristics.
Key Features
- Size: 7670 refers to the compressor size, indicating a larger airflow capability.
- Twin-Scroll Design: Reduces turbo lag and improves throttle response.
- Integrated Wastegate: Simplifies installation and enhances reliability.
- High Efficiency: Optimized for both power and fuel efficiency.
Overview of the Garrett GTX3071R
The Garrett GTX3071R is another popular choice among B5 S4 builders. It is known for its robust performance and ability to support high horsepower builds. The GTX series features innovative technologies that enhance its performance capabilities.
Key Features
- Size: 3071 refers to the compressor size, which is slightly smaller than the EFR 7670.
- Ball Bearing Design: Offers quicker spool times and improved durability.
- Versatile Performance: Suitable for a wide range of applications and power levels.
- High Flow Capability: Designed to support significant horsepower increases.
Performance Comparison
When comparing the performance of the BorgWarner EFR 7670 and the Garrett GTX3071R, several factors come into play, including spool time, peak power capability, and overall efficiency.
Spool Time
The spool time is critical for driving enjoyment and responsiveness. The EFR 7670, with its twin-scroll design, is known for its quick spool characteristics, making it an excellent choice for those who prioritize throttle response. On the other hand, the GTX3071R, thanks to its ball bearing design, also provides rapid spool times, though it may lag slightly behind the EFR in lower RPM ranges.
Peak Power Capability
In terms of peak power, the EFR 7670 is capable of supporting higher horsepower outputs, making it suitable for more aggressive builds. The GTX3071R, while still capable of impressive power levels, may not reach the same upper limits as the EFR. However, it is essential to consider that both turbos can produce significant power, and the choice may ultimately depend on your specific goals.
Overall Efficiency
Both turbos are designed with efficiency in mind, but the EFR 7670 often has a slight edge in terms of overall efficiency across the power band. This efficiency translates to better fuel economy and reduced heat generation, which can be beneficial for longevity and performance consistency.
Installation Considerations
When choosing between the BorgWarner EFR 7670 and the Garrett GTX3071R, installation considerations are crucial. Each turbo may require different setups and modifications to fit your B5 S4 correctly.
Mounting and Fitment
The EFR 7670’s integrated wastegate can simplify the installation process, reducing the need for additional components. Conversely, the GTX3071R may require some custom fabrication for optimal fitment, especially if you are using OEM components.
Supporting Modifications
Regardless of the turbo you choose, supporting modifications are essential to maximize performance. Consider upgrades such as:
- High-flow fuel injectors
- Upgraded intercooler
- Performance exhaust system
- ECU tuning
Conclusion
Choosing the right turbo for your B5 S4 build ultimately depends on your performance goals, driving style, and budget. The BorgWarner EFR 7670 offers exceptional efficiency and rapid spool, while the Garrett GTX3071R provides robust performance and versatility. Both turbos have their strengths, and either option can lead to an exhilarating driving experience when paired with the right supporting modifications.