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When it comes to turbocharging a Mazda Miata, two popular options among enthusiasts are the Precision 5857 and the BorgWarner EFR 7163. Both turbos offer unique advantages and performance characteristics that can significantly impact the driving experience. In this article, we will compare these two turbochargers to help you make an informed decision for your Miata build.
Overview of Precision 5857
The Precision 5857 is a well-regarded turbocharger known for its reliability and performance. It is often chosen for builds aiming for a balance between daily drivability and track performance.
- Compressor Size: 57mm
- Turbine Size: 76mm
- Max Horsepower: Approximately 600hp
- Boost Range: 15-30 psi
Overview of BorgWarner EFR 7163
The BorgWarner EFR 7163 is another excellent choice for turbo enthusiasts. It is designed with advanced technology, making it suitable for both street and racing applications.
- Compressor Size: 63mm
- Turbine Size: 76mm
- Max Horsepower: Approximately 700hp
- Boost Range: 15-30 psi
Performance Comparison
Both turbochargers offer impressive performance, but their characteristics differ. The Precision 5857 is known for its quick spool time, making it ideal for autocross and street driving. In contrast, the BorgWarner EFR 7163 provides more top-end power, making it better suited for track use.
Spool Time
Spool time is a critical factor in turbo performance. The Precision 5857 typically spools faster due to its smaller compressor size, allowing for quicker acceleration in lower RPM ranges.
Top-End Power
The BorgWarner EFR 7163 shines in delivering power at higher RPMs. Its larger compressor size allows it to sustain higher horsepower levels, making it a favorite for those seeking maximum performance on the track.
Installation Considerations
When choosing between these two turbos, installation can be a significant factor. The Precision 5857 is often considered easier to install due to its more compact design, while the EFR 7163 may require additional modifications to fit properly.
Mounting and Fitment
Fitment can vary based on your specific Miata model and other modifications. The Precision 5857 typically requires less space, making it suitable for tighter engine bays.
Supporting Modifications
Both turbos will require supporting modifications to achieve optimal performance. This may include upgraded fuel injectors, a high-flow fuel pump, and intercoolers. The EFR 7163 may necessitate more extensive modifications due to its size and power output.
Cost Analysis
Cost is always a consideration when building a turbocharged Miata. The Precision 5857 is generally more affordable, making it a great option for budget-conscious builders. The BorgWarner EFR 7163, while more expensive, offers advanced technology and higher performance potential.
Initial Investment
When comparing the initial costs, the Precision 5857 usually comes in at a lower price point, making it accessible for many enthusiasts.
Long-Term Value
The BorgWarner EFR 7163 may require a higher upfront investment, but its performance capabilities can justify the cost for serious racers looking for longevity and reliability.
Conclusion
In summary, both the Precision 5857 and BorgWarner EFR 7163 are excellent choices for turbocharging a Miata. The right choice depends on your specific goals, whether you prioritize quick spool times and affordability or maximum top-end power and advanced technology.
Ultimately, understanding the strengths and weaknesses of each turbo will help you make the best decision for your Miata build.