Before and After: Dyno Results Show 85 Hp Increase with Apr Stage 1 Ecu Tune on B9 S4

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The automotive industry is constantly evolving, with enthusiasts always seeking ways to enhance their vehicles’ performance. One of the most popular methods for achieving significant power gains is through ECU tuning. In this article, we will explore the dyno results of a B9 Audi S4 before and after an APR Stage 1 ECU tune, showcasing an impressive 85 horsepower increase.

Understanding ECU Tuning

ECU tuning involves modifying the software that controls the engine management system. By optimizing fuel maps, ignition timing, and boost levels, tuners can unlock additional power and improve the overall driving experience. APR, a well-known name in the tuning community, offers a range of tuning solutions, including the Stage 1 ECU tune for the B9 S4.

Dyno Testing Methodology

To accurately measure the performance gains from the APR Stage 1 ECU tune, a controlled dyno test was conducted. The following steps were taken:

  • The vehicle was placed on a chassis dynamometer.
  • Baseline power and torque figures were recorded before any modifications.
  • The APR Stage 1 ECU tune was installed.
  • Post-tune power and torque figures were recorded.

Before the Tune: Baseline Dyno Results

Before the APR Stage 1 ECU tune, the B9 S4 produced impressive numbers, showcasing the capabilities of its factory setup. The baseline results were as follows:

  • Horsepower: 335 hp
  • Torque: 369 lb-ft

After the Tune: Dyno Results

After the installation of the APR Stage 1 ECU tune, the B9 S4 exhibited remarkable improvements in both horsepower and torque. The post-tune results were:

  • Horsepower: 420 hp
  • Torque: 440 lb-ft

Performance Gains Overview

The difference in performance before and after the ECU tune is striking. The APR Stage 1 ECU tune provided:

  • 85 hp increase from 335 hp to 420 hp
  • 71 lb-ft increase in torque from 369 lb-ft to 440 lb-ft

Driving Experience Improvements

With the additional horsepower and torque, the driving experience of the B9 S4 was significantly enhanced. Drivers reported:

  • Quicker acceleration and throttle response.
  • Improved mid-range power delivery.
  • Smoother power band throughout the RPM range.

Considerations for ECU Tuning

While the performance gains from ECU tuning are appealing, there are several considerations to keep in mind:

  • Warranty implications: Tuning may void manufacturer warranties.
  • Fuel quality: Higher performance tunes may require premium fuel.
  • Potential for increased wear on engine components.

Conclusion

The APR Stage 1 ECU tune for the B9 S4 demonstrates the potential for significant performance enhancements in modern vehicles. With an 85 hp increase and improved driving dynamics, it is an attractive option for enthusiasts looking to elevate their driving experience. As always, it is essential to weigh the benefits against possible risks and ensure proper installation by a certified professional.