Dyno-tested: How the Brz Intake Manifold Boosts Nb Miata Power by 15 Hp

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The Mazda Miata has long been celebrated for its lightweight design and engaging driving experience. However, enthusiasts are always seeking ways to enhance performance. One of the most intriguing modifications is the installation of the BRZ intake manifold, which has been shown to boost power significantly. In this article, we will explore how this modification can add 15 horsepower to the NB Miata.

The Basics of the NB Miata Engine

The NB Miata, produced from 1998 to 2005, features a 1.8-liter inline-four engine. This engine, while capable, can benefit from various modifications to improve airflow and performance. The stock intake manifold is designed for efficiency, but it can limit power at higher RPMs.

<h2.Introduction to the BRZ Intake Manifold

The BRZ intake manifold, originally designed for the Subaru BRZ, offers a larger plenum and improved runner design compared to the stock Miata manifold. This design change allows for better airflow, which can lead to increased horsepower and torque.

<h3.Key Features of the BRZ Intake Manifold
  • Larger plenum volume for improved airflow
  • Optimized runner length for better torque delivery
  • Lightweight construction to maintain the Miata’s agile feel
<h2.Dyno Testing: Methodology

To measure the performance gains from the BRZ intake manifold, a series of dyno tests were conducted. The tests involved baseline runs with the stock manifold and subsequent runs after the BRZ manifold was installed. The same conditions were maintained for both tests to ensure accuracy.

<h3.Dyno Test Setup
  • Vehicle: 2001 NB Miata
  • Engine: 1.8L I4 with stock internals
  • Dyno Type: AWD dynamometer
  • Conditions: Ambient temperature of 70°F, 30% humidity
<h2.Results: Power Gains from the BRZ Intake Manifold

The results of the dyno testing were impressive. The NB Miata produced a baseline power output of 130 horsepower at the wheels with the stock intake manifold. After installing the BRZ intake manifold, the power output increased to 145 horsepower at the wheels, demonstrating a clear gain of 15 horsepower.

<h3.Torque Improvements

In addition to the horsepower gains, torque figures also showed improvement. The stock manifold produced a peak torque of 130 lb-ft, while the BRZ manifold increased this to 140 lb-ft. This increase in torque enhances the overall driving experience, especially in the mid-range RPMs.

<h2.Why the BRZ Manifold Works

The design of the BRZ intake manifold allows for more efficient airflow into the engine. The larger plenum and optimized runner lengths reduce restrictions, allowing the engine to breathe better. This results in improved combustion efficiency and power output.

<h3.Comparison with Other Intake Modifications
  • Stock Intake Manifold: 130 hp, 130 lb-ft
  • BRZ Intake Manifold: 145 hp, 140 lb-ft
  • Aftermarket Short Ram Intake: 135 hp, 132 lb-ft
<h2.Installation Process

Installing the BRZ intake manifold on an NB Miata is a straightforward process. Below are the general steps involved in the installation:

<h3.Step-by-Step Installation
  • Disconnect the battery.
  • Remove the stock intake manifold.
  • Install the BRZ intake manifold using new gaskets.
  • Reconnect all vacuum lines and sensors.
  • Reinstall any removed components, such as the throttle body.
  • Reconnect the battery and start the engine.
<h2.Considerations and Recommendations

While the BRZ intake manifold offers significant performance gains, there are a few considerations to keep in mind:

  • Ensure proper tuning after installation to maximize gains.
  • Consider additional modifications, such as a performance exhaust, for further enhancements.
  • Regular maintenance is essential to keep the engine running smoothly.
<h2.Conclusion

The BRZ intake manifold is a valuable upgrade for NB Miata owners looking to boost performance. The 15 horsepower gain and improved torque make it a worthwhile investment for both street and track use. With proper installation and tuning, this modification can transform the driving experience of the beloved Miata.