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The GR86 has become a popular platform for automotive enthusiasts looking to enhance performance. One of the most effective modifications is the installation of a supercharger, which can significantly boost power output. However, the size of the supercharger pulley plays a crucial role in determining the performance gains. In this article, we will compare the power gains associated with 60mm, 70mm, and 80mm supercharger pulleys in the GR86.
Understanding Supercharger Pulleys
Supercharger pulleys are essential components that control the speed of the supercharger. The diameter of the pulley directly affects the amount of boost generated. A smaller pulley will spin the supercharger faster, resulting in increased boost pressure and, consequently, more power. However, this also places additional strain on the engine and can affect reliability.
60mm Supercharger Pulley
The 60mm supercharger pulley is often considered the entry-level option for those looking to increase power in the GR86. With its smaller diameter, it allows for a higher RPM of the supercharger, leading to increased boost pressure. Here are some key points regarding the 60mm pulley:
- Boost Pressure: Typically generates a boost pressure of around 10-12 PSI.
- Power Gains: Users often report power gains of 40-60 horsepower at the wheels.
- Reliability: Offers a good balance between power and reliability for daily driving.
Pros and Cons of 60mm Pulley
- Pros:
- Significant power increase.
- Improved throttle response.
- Less strain on the engine compared to larger pulleys.
- Cons:
- Lower boost compared to larger options.
- May not satisfy those looking for maximum performance.
70mm Supercharger Pulley
The 70mm supercharger pulley strikes a balance between the 60mm and 80mm options. It offers a moderate increase in boost while still maintaining reasonable reliability. Here’s what to expect from the 70mm pulley:
- Boost Pressure: Generally produces around 12-14 PSI of boost.
- Power Gains: Users can expect power gains of 60-80 horsepower at the wheels.
- Reliability: Suitable for those who want more performance without sacrificing too much reliability.
Pros and Cons of 70mm Pulley
- Pros:
- Substantial power increase over the 60mm option.
- Better boost response for spirited driving.
- Still maintains a good level of reliability.
- Cons:
- Increased strain on the engine compared to the 60mm pulley.
- May require additional supporting modifications for optimal performance.
80mm Supercharger Pulley
The 80mm supercharger pulley is the largest option available and is designed for maximum performance. While it offers the highest boost levels, it also comes with increased risks regarding engine reliability. Here’s what you need to know about the 80mm pulley:
- Boost Pressure: Can achieve boost levels of 14-16 PSI.
- Power Gains: Users often report gains of 80-100 horsepower at the wheels.
- Reliability: Higher risk of engine strain and potential reliability issues.
Pros and Cons of 80mm Pulley
- Pros:
- Maximum power and torque increase.
- Ideal for track use and competitive racing.
- Highly responsive throttle due to high boost levels.
- Cons:
- Increased risk of engine damage and reliability issues.
- May require extensive supporting modifications.
- Less suitable for daily driving.
Conclusion
When choosing a supercharger pulley for the GR86, it’s essential to consider your performance goals and how much strain you’re willing to place on your engine. The 60mm pulley is an excellent choice for those seeking a reliable power increase for daily driving, while the 70mm pulley offers a balance of performance and reliability. For those pushing the limits on the track, the 80mm pulley provides maximum power but at the cost of increased risk. Ultimately, the decision should be based on your specific needs and the intended use of your vehicle.