Bilstein’s 6112 shocks are a popular upgrade for Toyota 4Runner owners seeking enhanced on-road handling and improved off-road capabilities. These shocks are part of a complete suspension system that includes the 6112s in the front and the 5160s in the rear. This article provides a detailed overview of the installation process for the Bilstein 6112s, along with insights into their technical design, performance characteristics, and practical considerations for installation and use.
Installation Overview
The installation of the Bilstein 6112 shocks is a do-it-yourself project that can be completed in a home garage, although some steps require careful attention to detail and the use of appropriate tools. The process is generally straightforward but requires lifting the vehicle and working with suspension components, which may be challenging for those unfamiliar with automotive mechanics.
Step 1: Vehicle Preparation and Safety
Before beginning the installation, it is essential to ensure the vehicle is lifted safely. The user should place blocks under the front tires to prevent the vehicle from rolling forward or backward. After loosening the lug nuts on one of the rear wheels, the vehicle should be jacked up under the rear axle to allow for tire removal. It is recommended to place a jack or jack stand under the frame for additional safety. This step ensures that the vehicle remains stable during the installation process.
Step 2: Removing the Factory Shocks
The next step involves removing the factory shocks. The process is relatively simple, as it only requires the removal of a nut at the top of the shock and a bolt at the bottom. The user should begin by removing the top nut first, followed by the bottom bolt. This allows for the removal of the factory shock without any additional complications.
Step 3: Installing the Reservoir Mounting Brackets
After removing the factory shocks, the next step is to install the brackets and worm clamps that will hold the reservoir in place. The user is advised to follow the instructions provided by Bilstein, as the manufacturer has developed a clear and detailed manual for this step. The brackets and worm clamps are essential for securing the remote reservoir, which is a key feature of the Bilstein 5160 shocks in the rear.
Step 4: Installing the 6112 Shocks
Once the mounting hardware is in place, the Bilstein 6112 shocks can be installed. The user should begin by positioning the top of the shock into the upper shock mount. It is important to ensure that the shock stem has the lower washer and bushing in place before pushing it through the upper shock mount. After the shock is positioned, the upper bushing and washer should be added, followed by securing the upper assembly with an M12 locknut.
Step 5: Compressing and Installing the Shocks
Compressing the shocks requires some effort, and it is recommended to have an assistant to help with this step. The user should slowly compress the shock and position it into the lower shock mount. Due to the resistance provided by the shock, two people are often necessary to complete this task. Once the lower portion of the shock is in place, the factory bolt should be installed and tightened to secure the shock in the lower mount.
Step 6: Installing the Remote Reservoir
The final step in the installation process involves the installation of the remote reservoir. The user should route the hose to the reservoir behind the main shock tube and ensure that the reservoir is positioned correctly. The worm clamps should be tightened gradually until the reservoir is secure. This step is critical, as the remote reservoir provides additional oil capacity and helps extend the suspension travel.
Step 7: Final Checks and Completion
After all components have been installed, the user should perform a final check to ensure that all bolts and clamps are properly tightened. It is also important to verify that the reservoir is securely mounted and that the hose is correctly routed. Once these checks are complete, the installation is considered finished, and the vehicle can be lowered from the jack.
Performance and Handling Improvements
The Bilstein 6112 and 5160 shocks are designed to significantly enhance both on-road and off-road performance. These shocks incorporate digressive valving, which allows the suspension to respond more effectively to high-velocity impacts such as large bumps and uneven terrain. This design ensures that the vehicle remains stable and composed, even in challenging driving conditions.
On-Road Handling
One of the most notable improvements provided by the Bilstein 6112 and 5160 shocks is the enhancement of on-road handling. These shocks transform the 4Runner into a more responsive and sporty vehicle, with reduced body roll and improved braking performance. The digressive valving helps to minimize nose diving during sudden stops and provides a more controlled driving experience. Additionally, the shocks reduce the effects of high winds on the highway, making the vehicle feel more stable and predictable.
The improved handling is particularly noticeable on roads with potholes or uneven surfaces. With the stock suspension, the vehicle may experience slight skips or jolts when navigating these obstacles at higher speeds. However, with the Bilstein shocks installed, the vehicle absorbs larger bumps more effectively, resulting in a smoother and more composed ride.
Off-Road Capabilities
In off-road conditions, the Bilstein 6112 and 5160 shocks provide increased suspension travel, which helps to maintain tire contact with the ground. This improvement enhances traction and stability, especially in situations where one or more tires may lift off the surface. While the Bilstein shocks do not provide the same level of extended travel as some aftermarket systems, they offer a noticeable improvement over the stock setup.
The front suspension, which features a double wishbone independent design, benefits from the increased oil capacity and durability of the 6112 shocks. However, to fully realize the potential of the front suspension travel, the user may need to install aftermarket upper control arms. The rear suspension, which uses a solid axle, benefits from the 5160 shocks without the need for additional modifications.
Weight Handling and Overlanding
The Bilstein 6112 and 5160 shocks are particularly well-suited for vehicles that are frequently loaded with gear or used for overlanding. The increased oil capacity and improved suspension travel help to maintain stability and comfort when carrying heavy loads. This makes the Bilstein suspension system an excellent choice for users who plan to use their 4Runner for extended trips or as a family vehicle.
Considerations for Lift Height
One of the key decisions when installing the Bilstein 6112 shocks is the amount of lift to apply to the front of the vehicle. The 6112 shocks allow for a range of lift heights, from 0 to 2.5 inches. The user should consider their specific needs and driving conditions when selecting the appropriate lift height.
A 1.6-inch lift is often recommended for users who do not plan to significantly lift the rear of the vehicle. This lift height helps to achieve a balanced appearance while maintaining good on-road handling. However, if the user plans to lift the rear, a higher front lift may be appropriate to maintain a level stance.
It is important to note that increasing the lift height also raises the center of gravity, which can affect on-road performance. A higher center of gravity may reduce stability during cornering and braking. Therefore, users who prioritize on-road handling should consider a more moderate lift height.
After any lift is installed, it is essential to perform an alignment. The lift alters the geometry of the front suspension, and an alignment is necessary to ensure proper handling and tire wear. This step should not be overlooked, as it helps to maintain the performance and safety of the vehicle.
Design and Technical Features
The Bilstein 6112 and 5160 shocks are designed with several key features that contribute to their performance and durability. The 6112 shocks feature a larger diameter shaft than the stock shocks, which increases their strength and rigidity. This design helps to withstand the increased stress associated with off-road driving and heavy loads.
The 5160 shocks in the rear also include a remote reservoir, which provides additional oil capacity and helps to extend suspension travel. The remote reservoir allows components that would otherwise be housed in the main monotube to be relocated, which contributes to the improved travel and damping characteristics.
Both the 6112 and 5160 shocks utilize digressive valving, which ensures that the shocks respond more effectively to high-velocity impacts. This design helps to smooth out larger bumps and uneven terrain while maintaining responsiveness to smaller irregularities.
Cost and Value
The Bilstein 6112 and 5160 shocks represent a significant investment, with a total cost of approximately $1,000. However, this cost is justified by the improvements in on-road handling, off-road performance, and overall ride quality. The shocks provide a noticeable upgrade over the stock suspension, making them a worthwhile investment for users who prioritize performance and durability.
In addition to the initial cost, users should also consider the potential need for additional components such as upper control arms or alignment services. These additional costs should be factored into the overall investment when deciding whether to install the Bilstein shocks.
Conclusion
The Bilstein 6112 and 5160 shocks offer a comprehensive suspension upgrade for Toyota 4Runner owners. The installation process is manageable for DIY users, and the performance benefits are significant. These shocks improve on-road handling, enhance off-road capabilities, and provide a more composed and stable driving experience. With the right lift height and proper alignment, the Bilstein suspension system can transform the 4Runner into a versatile and capable vehicle for both on-road and off-road use.