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The 1990 NA Miata is a beloved sports car known for its lightweight design and agile handling. While it originally came with a modest 115 horsepower, many enthusiasts have discovered that with a few simple modifications, it’s possible to boost the power to around 140 horsepower. This article explores the modifications that can achieve these real-world results.
Understanding the NA Miata
The NA Miata, produced from 1989 to 1997, is often praised for its balance and driving experience. It features a 1.6-liter inline-four engine, which, while not overly powerful, offers a fun and engaging driving experience. The goal of many Miata owners is to enhance performance without compromising the car’s character.
Common Modifications for Increased Power
- Cold Air Intake
- Performance Exhaust System
- ECU Tune
- Header Upgrade
- Lightweight Flywheel
Cold Air Intake
One of the first modifications many Miata owners consider is a cold air intake. This upgrade allows the engine to breathe better by drawing in cooler air, which is denser and contains more oxygen. This can lead to a noticeable increase in horsepower and throttle response.
Performance Exhaust System
A performance exhaust system reduces back pressure and allows exhaust gases to exit more efficiently. By replacing the stock exhaust with a high-flow system, you can improve engine performance and gain a few extra horsepower. Additionally, a performance exhaust can enhance the sound of the Miata, making it more enjoyable to drive.
ECU Tune
Tuning the engine control unit (ECU) is a vital step in maximizing the benefits of any modifications. A proper ECU tune adjusts fuel maps and ignition timing to optimize performance based on the new airflow from the cold air intake and exhaust system. This can lead to significant gains in horsepower and overall drivability.
Header Upgrade
Upgrading the factory header to a performance header can also yield power gains. A performance header is designed to improve exhaust flow, which can help the engine produce more power. This modification often works best when combined with a performance exhaust system.
Lightweight Flywheel
A lightweight flywheel reduces rotational mass, allowing the engine to rev more freely. This modification can improve acceleration and overall responsiveness of the Miata. While it doesn’t directly increase horsepower, the improved performance characteristics can make the car feel significantly quicker.
Real-World Results
After implementing these modifications, many Miata owners report achieving approximately 140 horsepower, a significant increase over the stock 115. The combination of improved airflow, optimized tuning, and reduced weight leads to a more spirited driving experience.
Considerations Before Modifying
While these modifications can enhance performance, it’s essential to consider a few factors:
- Budget: Performance upgrades can vary in cost, so plan accordingly.
- Installation: Some modifications require mechanical skills or professional help.
- Insurance: Check if modifications will affect your insurance policy.
- Emissions: Ensure that your modifications comply with local emissions regulations.
Conclusion
The 1990 NA Miata is a fantastic platform for performance modifications. With simple upgrades like a cold air intake, performance exhaust, ECU tune, header upgrade, and lightweight flywheel, it’s possible to transform the driving experience and achieve real-world power gains. Whether you’re a seasoned enthusiast or a newcomer to the world of car modifications, these changes can make your Miata even more enjoyable on the road or track.