How To Put A Spoiler On A Car

Adding a spoiler to your car can be a rewarding project, enhancing both its aesthetics and potentially its performance. Spoilers, wings, and air dams have evolved from racing modifications to popular aftermarket additions. This article provides a comprehensive guide for experienced DIYers to correctly install a spoiler, ensuring a secure fit and optimized functionality.

Spoiler Basics: More Than Just Looks

Before diving into the installation process, it's crucial to understand what a spoiler actually does. A spoiler, short for "spoiler," is designed to spoil unfavorable air movement across a body of a vehicle in motion, most often described as turbulence or lift. While many aftermarket spoilers are primarily cosmetic, a properly designed and installed spoiler can genuinely improve a vehicle's aerodynamic properties.

Understanding Aerodynamics

At higher speeds, air flowing over and under a car can create lift, reducing tire grip and stability. A well-designed spoiler redirects airflow, creating downforce, which presses the car against the road. This is especially beneficial for rear-wheel-drive vehicles, as increased downforce over the rear axle improves traction. However, it is important to note that on front-wheel-drive cars, excessive downforce over the rear may increase understeer. The effectiveness of a spoiler is also closely tied to the car's overall aerodynamic profile. Factors such as the car's coefficient of drag (Cd) and frontal area influence how effectively the spoiler can modify airflow.

Spoiler vs. Wing

It's important to differentiate between a spoiler and a wing. While often used interchangeably, they operate differently. A spoiler typically integrates with the existing body lines of the car, modifying airflow near the surface. A wing, on the other hand, is a separate airfoil (like an airplane wing) that is mounted higher and creates downforce by generating a pressure difference between its upper and lower surfaces. Wings are generally more effective at generating downforce than spoilers, but they also create more drag. Air dams or front spoilers that are fitted to the front of a vehicle will reduce the amount of air flowing under the vehicle. This means that there is less air pressure under the car, leading to a net downward force.

Technical Breakdown: Installing Your Spoiler

This installation guide assumes you have basic automotive tools, including a drill, socket set, measuring tape, masking tape, and safety glasses. It also assumes you are working on a vehicle where drilling into the body is acceptable.

1. Choosing the Right Spoiler

Select a spoiler that is specifically designed for your vehicle model. This ensures proper fitment and optimal aerodynamic performance. Consider the material (ABS plastic, fiberglass, carbon fiber) based on your budget and desired aesthetics. ABS plastic is durable and cost-effective, while carbon fiber is lightweight and offers a high-performance look.

2. Preparation

Begin by cleaning the area where the spoiler will be mounted. Use soap and water, followed by a degreaser, to remove any wax, dirt, or residue. This ensures proper adhesion if you are using any adhesive during the installation. Test-fit the spoiler to the trunk lid or hatch to determine the precise mounting location. Use masking tape to mark the outline of the spoiler's base or mounting points. Double and triple-check the alignment to ensure it's centered and straight.

3. Drilling (If Required)

Many spoilers require drilling holes for secure mounting. This is where precision is paramount. Use a center punch to mark the exact locations for the drill holes within the taped outline. Start with a small pilot drill bit, gradually increasing the size to match the diameter of the mounting bolts or screws. Be extremely careful not to drill through any wiring harnesses or other components beneath the surface. A step drill bit can be useful for creating clean, accurate holes.

4. Corrosion Protection

Any time you drill into the body of a vehicle, you expose bare metal, which is susceptible to rust. Apply a rust-inhibiting primer to the edges of the drilled holes. This will prevent corrosion from spreading and compromising the structural integrity of the metal.

5. Mounting the Spoiler

Depending on the spoiler design, you may use a combination of bolts, screws, and adhesive. If using bolts or screws, apply thread sealant to prevent water from seeping into the holes. If using adhesive, follow the manufacturer's instructions carefully. Use a high-quality automotive-grade adhesive designed for exterior applications. Apply the adhesive evenly to the spoiler's base and press it firmly onto the mounting surface. Use masking tape to secure the spoiler in place while the adhesive cures. Allow the adhesive to cure completely according to the manufacturer's instructions (typically 24-48 hours).

6. Final Touches

Once the adhesive is cured (if applicable), remove the masking tape. Inspect the installation for any gaps or imperfections. Touch up any scratches or blemishes with automotive paint. Clean the spoiler and surrounding area to remove any residue.

Common Issues and Maintenance

Even with careful installation, some issues can arise. Here are some common problems and how to address them:

• Loose Spoiler: Check the mounting bolts or screws regularly for tightness. If using adhesive, ensure it hasn't deteriorated over time. If a spoiler becomes loose, it's critical to re-secure it immediately to prevent it from detaching completely, which can be dangerous to other drivers.
• Rust: Inspect the area around the mounting holes for rust. Treat any rust promptly to prevent it from spreading. Consider using a rust converter to neutralize existing rust and prevent further corrosion.
• Paint Damage: The area around the spoiler can be susceptible to scratches and paint damage. Apply a protective film or wax to the area to minimize damage.
• Adhesive Failure: Over time, the adhesive can fail due to exposure to weather and temperature changes. If you notice any signs of adhesive failure, such as the spoiler starting to lift or move, reapply the adhesive immediately.

Do's and Don'ts / Best Practices

Following these do's and don'ts will ensure a successful spoiler installation:

Do's:

• Do choose a spoiler designed for your specific vehicle model.
• Do thoroughly clean and degrease the mounting surface.
• Do use a center punch to accurately mark drilling locations.
• Do use rust-inhibiting primer on drilled holes.
• Do use thread sealant on mounting bolts or screws.
• Do follow the manufacturer's instructions for adhesive application and curing.
• Do double-check alignment before drilling or adhering the spoiler.

Don'ts:

• Don't drill without carefully checking for wiring harnesses or other components underneath.
• Don't overtighten mounting bolts or screws.
• Don't use low-quality adhesive.
• Don't rush the installation process.
• Don't ignore any signs of looseness or damage.
• Don't install a spoiler if you are not comfortable drilling into your car's body.

Conclusion

Installing a spoiler can be a worthwhile upgrade for your vehicle, offering both aesthetic and potential performance benefits. By following these detailed steps and adhering to the best practices outlined above, you can achieve a professional-looking installation that enhances your car's appearance and potentially improves its handling. However, if you are unsure about any aspect of the installation process, it is always best to consult with a qualified mechanic. A secure and properly installed spoiler is essential for both your safety and the safety of other drivers on the road. If you're primarily aiming for improved aerodynamics, consider investing in a quality spoiler designed for performance, not just aesthetics. Happy modding!