Peter Banks If you’re a Subaru performance enthusiast, you’ve probably heard of the Subaru STI stiffer bushing. This modification is frequently mentioned in discussions about how to improve the handling of the Subaru WRX and STI. In this article, we’ll dive into what the stiffer bushing is, how it works, and what benefits you can expect from installing it on your vehicle.
Key Takeaways
- The Subaru STI stiffer bushing is a replacement for the stock bushing that connects the rear differential to the chassis.
- It is made of stiffer material than the stock bushing, which reduces movement and flex in the rear suspension.
- The stiffer bushing can improve handling, reduce wheel hop, and increase traction.
- It is a popular upgrade for Subaru performance enthusiasts who want to improve the handling of their vehicle.
What Is the Subaru STI Stiffer Bushing?
The Subaru STI stiffer bushing is a replacement for the stock bushing that connects the rear differential to the chassis. The stock bushing is made of rubber, which is relatively soft and flexible. This allows the rear suspension to move and flex under load, which can negatively affect handling and traction.
The STI stiffer bushing is made of stiffer material, typically polyurethane or aluminum. This reduces movement and flex in the rear suspension, which can provide a more stable and predictable driving experience.
How Does the Stiffer Bushing Work?
The stiffer bushing works by reducing the amount of movement and flex in the rear suspension. This can provide several benefits, including improved handling, reduced wheel hop, and increased traction.
When you’re driving your Subaru at high speeds or pushing it hard through corners, the rear suspension can flex and move. This can cause the rear wheels to lose traction or cause the car to feel unstable. The stiffer bushing reduces this movement and flex, which provides a more solid and predictable driving experience.
Additionally, the stiffer bushing can help to reduce wheel hop, which is when the rear wheels bounce or hop under hard acceleration. This can negatively affect traction and acceleration, and can also cause damage to the drivetrain. The stiffer bushing helps to keep the rear suspension more stable under hard acceleration, which can reduce or eliminate wheel hop.
Benefits of the Stiffer Bushing
There are several benefits to installing the Subaru STI stiffer bushing on your vehicle. These include:
Improved Handling
The stiffer bushing can improve handling by reducing the amount of movement and flex in the rear suspension. This can provide a more stable and predictable driving experience, particularly when pushing the car at high speeds or through corners.
Reduced Wheel Hop
Wheel hop can be a significant problem for Subaru WRX and STI owners. The stiffer bushing can help to reduce or eliminate wheel hop, which can improve acceleration and reduce stress on the drivetrain.
Increased Traction
The stiffer bushing can also improve traction by reducing movement and flex in the rear suspension. This can help to keep the rear wheels planted on the ground, particularly in situations where there is uneven or bumpy terrain.
Better Performance on the Track
If you’re a track enthusiast, the stiffer bushing can help to improve your lap times and overall performance. The reduced movement and flex in the rear suspension can provide a more stable and predictable driving experience, allowing you to push the car harder through corners and under braking.
How to Install the Stiffer Bushing
Installing the stiffer bushing on your Subaru is a relatively straightforward process. However, it does require some mechanical knowledge and the right tools. Here is a general overview of the installation process:
- Raise the car and support it on jack stands.
- Remove the stock bushing from the rear differential.
- Install the stiffer bushing in its place.
- Lower the car and test drive to ensure everything is working properly.
It’s important to note that installing the stiffer bushing may cause some additional NVH (noise, vibration, and harshness) in the cabin. This is because the stiffer material transmits more vibration and noise from the rear suspension to the chassis. However, many Subaru performance enthusiasts find that this is a small price to pay for the improved handling and performance benefits of the stiffer bushing.
Frequently Asked Questions
Q: Will the stiffer bushing make my ride harsher?
A: Installing the stiffer bushing may cause some additional NVH in the cabin, which can make the ride feel harsher. However, many Subaru performance enthusiasts find that the improved handling and performance benefits of the stiffer bushing are worth the tradeoff.
Q: Do I need to install the stiffer bushing on both the front and rear suspension?
A: No, the stiffer bushing is typically only installed on the rear suspension, as this is where it can provide the most significant handling and performance benefits.
Q: Can I install the stiffer bushing myself, or do I need to take it to a professional?
A: While it is possible to install the stiffer bushing yourself, it does require some mechanical knowledge and the right tools. If you’re not comfortable working on your car, it’s best to take it to a professional mechanic or performance shop.
Conclusion
The Subaru STI stiffer bushing is a popular upgrade for Subaru performance enthusiasts who want to improve the handling and performance of their vehicle. By reducing movement and flex in the rear suspension, the stiffer bushing can provide a more stable and predictable driving experience, reduce wheel hop, and increase traction. While the installation process may require some mechanical knowledge and tools, many Subaru owners find that the improved handling and performance benefits of the stiffer bushing are well worth the investment.
