Most car enthusiasts agree that the factory suspension on many vehicles feels like a compromise between comfort and performance. You likely want a sharper response when cornering and a more aggressive look that eliminates that unsightly wheel gap.
Learning how to install coilovers is a rite of passage for any DIY mechanic looking to transform their vehicle’s handling and aesthetics. This upgrade allows you to adjust your ride height and damping settings to suit your specific driving style.
In this guide, we will walk you through the entire process, from the essential tools you need to the final torque specs. You will gain the confidence to perform this swap safely in your own garage while avoiding common pitfalls.
Understanding the Basics of Coilover Suspension
Before you dive into the wheel wells, it is important to understand what you are actually working with. A coilover is essentially a coil spring over a shock absorber, integrated into a single unit.
Unlike a traditional strut and spring setup, most aftermarket coilovers feature an adjustable threaded body. This design allows you to move the lower spring perch up or down to change the height of the vehicle.
High-end kits also offer damping adjustment, which controls how fast the shock compresses and rebounds. This level of customization is why coilovers are the preferred choice for track days and off-road builds alike.
Beyond performance, coilovers offer a structural benefit by often being lighter than the bulky factory components they replace. This reduces unsprung weight, allowing your suspension to react faster to bumps in the road.
Whether you are lowering a street car or lifting an off-road rig, the fundamental principles of the installation remain the same. Accuracy and safety are your two best friends during this project.
Essential Tools and Materials for the Job
You cannot finish this job with a basic screwdriver set; you need the right gear to handle stubborn bolts and heavy components. Start by gathering a high-quality floor jack and a pair of heavy-duty jack stands.
A comprehensive socket set, including deep sockets and various extensions, is mandatory for reaching hidden bolts. You will likely need metric sizes ranging from 10mm up to 24mm, depending on your vehicle make.
A breaker bar is your secret weapon for loosening bolts that have been rusted in place for years. For the final assembly, a calibrated torque wrench is non-negotiable to ensure every fastener is secured to factory specifications.
Do not forget the “liquid mechanic” known as penetrating oil. Spraying your suspension bolts 24 hours before you start can save you hours of frustration and prevent snapped hardware.
- Floor jack and jack stands
- Socket set (Metric and Standard)
- Breaker bar and torque wrench
- Penetrating oil (like PB Blaster or WD-40 Specialist)
- Anti-seize lubricant
- Measuring tape or calipers
- Safety glasses and mechanic gloves
Pre-Installation Preparation and Safety
Safety should be your primary concern when working under a vehicle that weighs several thousand pounds. Always perform this work on a level, concrete surface to prevent the jack stands from sinking or shifting.
Before lifting the car, loosen the lug nuts on your wheels while the tires are still touching the ground. This prevents the wheels from spinning while you try to apply force to the lug wrench.
Once the car is in the air, place your jack stands under the frame rails or designated lifting points. Give the car a firm “shake test” to ensure it is stable before you even think about crawling underneath.
It is also a smart move to disconnect the negative battery terminal if your vehicle is equipped with electronic suspension sensors. This prevents the computer from throwing error codes while the components are unplugged.
Finally, clean the area around the suspension mounts with a wire brush. Removing road grime and rust makes it much easier to see what you are doing and ensures a clean fit for the new parts.
how to install coilovers
Now that the car is secure and the wheels are off, it is time to begin the actual removal of the old components. Start at the front of the vehicle, as the front suspension is usually more complex than the rear.
Locate the sway bar end links and disconnect them from the strut body. These are often the most difficult bolts to remove, so use plenty of penetrating oil and a backup wrench if the stud spins.
Next, remove the bolts holding the brake lines and ABS sensor wires to the strut. Never let the brake calipers hang by the rubber hoses; use a zip tie or bungee cord to support them from the frame.
Loosen the large “clevis bolts” that connect the bottom of the strut to the steering knuckle. You may need to use a rubber mallet to tap the bolts out once the nuts are removed.
Moving to the engine bay, locate the top hat nuts that secure the strut to the shock tower. Loosen these, but leave one nut threaded on by a few turns to prevent the strut from falling out unexpectedly.
While supporting the weight of the strut from below, remove that final top nut. Carefully lower the assembly out of the wheel well, being mindful not to snag any wiring harnesses or CV boots.
With the old unit out, compare it to your new coilover to ensure the mounting points match. Apply a thin layer of anti-seize to the threaded body of the coilover to prevent future corrosion.
Slide the new coilover into the shock tower and secure the top nuts finger-tight. Then, align the bottom mount with the steering knuckle and slide the large clevis bolts back into place.
Reattach your brake line brackets and sway bar end links to the new unit. Once everything is aligned, use your torque wrench to tighten all fasteners to the manufacturer’s recommended settings.
Repeat this process for the other three corners of the vehicle, taking care to keep your workspace organized. Keeping track of which bolt goes where is essential for a successful installation.
Setting the Proper Preload and Ride Height
One of the biggest mistakes DIYers make is failing to set the spring preload before the car hits the ground. Preload refers to how much the spring is compressed while the coilover is at full extension.
Consult your coilover manual, but a general rule is to tighten the spring perch until the spring is snug, then add another 4-5mm of tension. This prevents the spring from clunking or moving around when you hit a bump.
To set the ride height, use the lower locking collar to adjust the length of the entire coilover assembly. Measuring from the center of the wheel hub to the fender arch is the most accurate way to ensure side-to-side consistency.
Remember that the suspension will “settle” after you drive the car for a few miles. It is often better to set the height slightly higher than your target, as it will likely drop another quarter-inch over the first week.
Always use the included spanner wrenches to lock the collars tightly against each other. If these collars vibrate loose, your ride height will change unexpectedly, which can lead to dangerous handling characteristics.
Common Mistakes and How to Avoid Them
A common error is tightening the suspension bolts while the wheels are still hanging in the air. This “clocks” the rubber bushings in a twisted position, leading to premature failure and a harsh ride.
Instead, wait until the car is back on its own weight before performing the final torque on the control arm bolts. If you cannot reach them with the wheels on, use ramps or blocks to load the suspension.
Ignoring the need for a professional alignment is another recipe for disaster. Changing your ride height significantly alters your camber and toe settings, which can ruin a set of tires in less than 500 miles.
Do not skip the step of lubricating the threads. Road salt and moisture can cause aluminum collars to seize onto steel bodies, making future adjustments impossible without a torch or a hacksaw.
Finally, ensure that your brake lines and sensor wires have enough slack throughout the entire range of steering. Turn the steering wheel from lock to lock while the car is on stands to check for any pulling or rubbing.
Measuring Success and Performance Testing
Once you have finished the install and torqued everything down, it is time for the first test drive. Start with a slow crawl around the block, listening for any unusual noises like popping or metallic clicking.
If you hear a noise, it is usually a sign that a sway bar link is loose or the top hat nuts need another turn. Small sounds can often be solved with a quick retightening of the hardware.
After a few miles of driving, re-measure your ride height at all four corners. If one side is lower than the other, make the necessary adjustments and lock the collars back down.
Once you are confident in the mechanical setup, take the car to a reputable alignment shop. Tell the technician you have installed coilovers and specify if you want a factory spec or a more aggressive street/track setup.
The true measure of success is how the car feels. You should notice a significant reduction in body roll and a more connected feel to the pavement, giving you more confidence behind the wheel.
Frequently Asked Questions About Coilover Installation
Do I need an alignment immediately after installing coilovers?
Yes, you absolutely need an alignment. Any time you change the height of your vehicle, the suspension geometry changes, specifically the toe and camber. Driving without an alignment will cause rapid tire wear and unpredictable handling.
Can I install coilovers by myself in a garage?
Absolutely. Most enthusiasts find that learning how to install coilovers is a manageable weekend project. As long as you have a solid set of tools, jack stands, and a bit of patience, it is a very rewarding DIY task.
How long does the installation usually take?
For a beginner, expect the job to take 4 to 6 hours. If you are working on an older car with rusted bolts, it may take longer. Experienced mechanics can often finish the entire swap in under 3 hours.
Will coilovers make my ride too stiff for daily driving?
This depends on the spring rates and damping settings of the kit you choose. Many modern coilovers offer adjustable damping, allowing you to soften the ride for your commute and stiffen it for spirited weekend drives.
Should I reuse my factory top mounts?
Some budget coilover kits require you to transfer your factory top mounts using a spring compressor. However, many high-quality kits come with their own pillow-ball or rubber top mounts, making the installation much faster and easier.
Final Thoughts on Your Suspension Upgrade
Taking the initiative to upgrade your own suspension is one of the best ways to connect with your vehicle. By following this guide, you have learned the technical steps and the safety protocols required for a professional-grade result.
Once you understand how to install coilovers, you can help your friends with their builds or even fine-tune your own setup as your driving needs evolve. This knowledge is the foundation of becoming a true automotive hobbyist.
Remember to check your torque settings again after 100 miles of driving to ensure nothing has vibrated loose. Suspension components endure a lot of stress, and a quick safety check provides peace of mind for the long road ahead.
Enjoy the improved handling, the sleek new look, and the satisfaction of a job well done. Stay safe, keep your tools clean, and we will see you out on the trails or at the next track day!
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