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This guide is for owners of vehicles seeking enhanced suspension performance and durability. The Powerflex PFR5-4617 Rear Upper Inner Control Arm Wishbone Bush Pair offers a significant upgrade over stock rubber components, providing improved handling and control. A key caveat is that the stiffer compound may introduce more road noise and vibration into the cabin, which might not be desirable for all drivers.
| Model Part Number | PFR5-4617 |
|---|---|
| Brand | Powerflex |
The Black Series compound used for PFR5-4617 features a Shore 95A hardness rating, which is significantly stiffer than standard rubber and Powerflex's purple road series compounds.
While they can be used for daily driving, the Black Series compound is optimized for extreme track use. This means you will likely experience an increase in road noise and vibration (NVH) compared to stock rubber bushings. For comfort-focused daily drivers, Powerflex's Road Series (purple) might be a more appropriate choice.
The primary benefit is reduced suspension deflection under load. This leads to more precise handling, sharper steering response, and maintained suspension geometry, especially during performance driving or heavy braking.
Powerflex polyurethane bushes are known for their longevity and durability, often outlasting the original rubber components by a considerable margin, especially in performance applications.
Yes, a small amount of the supplied silicone grease or a similar silicone-based lubricant should be applied to the polyurethane surfaces during installation to ensure smooth operation and prevent squeaking.
This refers to the specific location within your vehicle's rear suspension system where these bushes are fitted. They are part of the control arm assembly that connects to the chassis.
This is an expected characteristic of the stiffer 'Black Series' polyurethane compound, especially when compared to softer rubber bushings. It signifies the bush is performing as intended by minimizing deflection. If NVH is a significant concern, consider if this performance-oriented compound is the right choice for your application.
The tight tolerances and stiffness of polyurethane can make installation challenging. Ensure the mounting points are clean and free of debris. Using a suitable bush insertion tool or seeking professional installation is recommended.
While less common with polyurethane than rubber, squeaking can occur if the bushes are not properly lubricated during installation or if dirt ingress occurs. Re-lubricating with a silicone-based lubricant (not petroleum-based) and ensuring a clean fit may resolve this.
Setup: These bushes are designed as a direct replacement for the original control arm wishbone bushes. Installation typically involves removing the old rubber bushes and pressing in the new Powerflex polyurethane units. Due to the high stiffness of the material, professional installation is recommended to ensure correct fitting and avoid damage.
Compatibility: Part number PFR5-4617 is specific to the Rear Upper Inner Control Arm Wishbone position. Always verify fitment with your vehicle's specific make, model, and year before purchase.
Care: Polyurethane bushes are generally maintenance-free. Avoid using petroleum-based solvents or degreasers directly on the bushes, as these can degrade the material. A mild soap and water solution can be used for cleaning if necessary. Regular inspection for any signs of damage or excessive wear is advised, although the durable nature of the material means this is rarely an issue.
