Bringing Your Classic Back to Life: NA Miata Restoration ...

Eiginber Belarmino
November 15, 2024

The NA Miata, celebrated for its timeless design and agile driving experience, is a true classic in the automotive world. Restoring one of these roadsters, especially an older model that’s seen plenty of roads, can be a wonderfully rewarding project for any car enthusiast. While restoration takes effort and time, the results are absolutely worth it. In this guide, we’ll walk through a comprehensive step-by-step plan to bring your NA Miata back to life.

Assessing the Vehicle’s Condition

Before diving into any major work, it’s essential to fully assess the car’s current state. This step helps you decide where to begin and what repairs are necessary.

When inspecting the exterior, have a few tools on hand, including a magnet, flashlight, and fine-detail camera. Rust is a common issue with older Miatas, so start by checking areas prone to rust, such as the rocker panels, wheel arches, and the underbody. Run the magnet over the body – if it doesn’t stick, it likely indicates body filler, which suggests previous repairs. With a complete list of damaged spots, you’ll know if the rust is only surface-deep or has caused more severe structural issues.

For the mechanical side, start up the engine and listen carefully for any unusual sounds like ticking or knocking, which might indicate wear. Tools like an engine stethoscope, code reader, and flashlight can help spot issues more easily. Test all critical components, from the brakes to the clutch and transmission, and look around the engine and suspension for any leaks. This inspection will give you a clearer picture of which parts may need rebuilding or replacing.

The interior, though often overlooked, also deserves attention. Examine the seats, dashboard, and carpet for wear or damage, and check all switches, knobs, and gauges to see if they function. From here, you can decide if cleaning, restoring, or replacing interior elements will best bring the car’s cabin back to life.

Repairing Rust and Bodywork

One of the biggest aspects of restoration is addressing rust and dents. Tackling these issues early on ensures a solid and long-lasting foundation.

For rust removal, tools like a wire brush, angle grinder, sandpaper, and rust remover gel will be essential. Begin by removing any loose rust with the brush or grinder. For small rust spots, apply rust remover gel and finish with a rust-neutralizing primer to prevent further corrosion. If you’re dealing with larger rusted-out areas, cut away the affected metal and weld in a patch panel. This step stops rust in its tracks, preserving both the car’s appearance and structural integrity.

Body filler is your friend when it comes to dents. Apply the filler to dents or uneven spots, then sand it down in stages, starting with 80-grit sandpaper and gradually working up to 400-grit until you get a smooth, paint-ready surface. Once the body is smooth, it’s time for priming and painting. Using primer and a spray gun, cover the entire car, then sand it down with 400-grit sandpaper for better adhesion. Remove dust with a tack cloth, mask off sensitive areas, and then apply paint in thin, even coats. A fresh paint job will not only protect the body but also bring back that original Miata shine.

Interior Restoration

Bringing the NA Miata’s interior back to life makes a huge difference in its overall feel and comfort.

If you’re swapping out the dashboard, you’ll want to transfer the VIN plate carefully. Drill out the original rivets, place the VIN plate on the new dashboard, and secure it with replacement rivets to retain the car’s unique identity. Next, replace the seats and carpet if they’re showing signs of wear. After removing the old carpet, place the new carpet in, trimming around key areas like seatbelt mounts and the shifter. Use fabric glue for a snug fit that will stay in place. This upgrade improves comfort and cuts down on road noise.

Finally, restoring the steering wheel can be crucial for functionality. If the clock spring (which controls the horn and turn signal mechanism) is worn, replace it. Lightly sanding down any plastic parts can help you achieve a smoother fit and restore functionality.

Suspension and Undercarriage Work

Restoring the NA Miata’s suspension and undercarriage gives it that original, smooth driving experience, making it feel more stable and responsive.

Begin with a suspension refresh by replacing worn components like bushings and shocks. Jack stands, a socket wrench, and a bushing press tool will come in handy. If you’re aiming for a stock-like feel, go for OEM or aftermarket lowering springs with Bilstein or KYB shocks to maintain the Miata’s nimble handling.

For the undercarriage, start by cleaning and degreasing, then apply an underbody coating. This spray-on layer will protect against moisture and rust, extending the life of the undercarriage – a worthwhile investment, especially if you drive in humid or coastal areas.

Engine and Exhaust Overhaul

The engine is the Miata’s heart, so it deserves some attention. A well-running engine means better performance and a smoother ride.

Start with a basic tune-up, replacing spark plugs, belts, and hoses. A vacuum gauge can help you detect intake leaks, while a timing light will help you set the timing correctly. This step will get the engine running smoothly and efficiently, giving you peace of mind for the long haul.

For a little extra flair, consider upgrading the exhaust system. Stainless steel cat-back exhausts are popular for Miatas, as they improve both sound and performance. Just ensure all hangers are aligned to prevent any rattling. This upgrade can enhance the car’s exhaust note without compromising the classic feel.

Upgrading Electricals and Safety

Electrical upgrades and safety checks are essential to bring your Miata up to modern standards.

Begin by inspecting the wiring with a multimeter. Check for any frayed connections or loose grounds. If you want brighter lighting, consider replacing bulbs with LEDs – just make sure they don’t detract from the classic look. Also, check the headlight motors to confirm they’re working well.

A dash cam is a great modern addition that blends safety with convenience. Mount the dash cam and run the wiring discreetly through the interior trim for a clean install. Choose a model with night vision and collision detection to get the most value out of it. Finally, inspect the seatbelts for retraction strength and replace if necessary. Also, confirm that any airbag components are working (if your model has them) to ensure the Miata meets today’s safety standards.

Detailing and Finishing Touches

This final phase is all about the little details that make a restoration truly complete.

First, replace any old weatherstripping and trim, which can help prevent water leaks and improve noise insulation. Weatherstripping kits make this process easier, and an adhesive remover can help clear away any sticky residue. For the paint, a clay bar, polish, and wax can help you achieve a high-gloss, showroom finish. You might even consider a ceramic coating for long-lasting protection.

Wrap up the interior by vacuuming the seats, carpet, and dashboard. Use leather conditioner on the seats (if leather) and a UV-protectant on the dashboard to prevent future fading. These final touches make the Miata feel as inviting as it did in its prime.

FAQs

Q1: How much does it cost to restore an NA Miata?
Restoration costs vary widely. A minor restoration might cost a few thousand dollars, while a full overhaul with new paint, bodywork, and engine work can be significantly higher.

Q2: Can a beginner restore an NA Miata?
Yes, a beginner with the right tools and patience can handle much of the work. Miatas are relatively straightforward to work on and have a supportive enthusiast community.

Q3: How long does it take to restore an NA Miata?
A simple restoration could take a few weekends, while a complete overhaul can stretch over several months depending on your availability and the scope of work.

Q4: Where are common rust areas on an NA Miata?
The rocker panels, wheel arches, underbody, and rear sills are all common areas for rust on the NA Miata.

Q5: Do I need a garage to restore an NA Miata?
While a garage is helpful, it’s not a must. Just be mindful of the weather, especially if you’re doing bodywork or painting.

Q6: Should I keep the NA Miata original or customize it?
It’s a personal choice! Keeping it original maintains the classic feel, while tasteful modifications can make the Miata even more fun and unique to drive.

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