The Mazda MX-5 Miata (ND) is celebrated as one of the best-handling sports cars on the road, thanks to its sub-2,500-pound curb weight, near-perfect 50:50 weight distribution, and double-wishbone front suspension. Yet even the most agile factory setup can be improved. Enthusiasts looking to sharpen turn-in response, reduce body roll, and gain adjustability for track days or autocross often turn to aftermarket suspension. Among the top choices are Voodoo13 coilovers and upgraded sway bars. When combined, these components transform the ND Miata from a fun daily driver into a precision corner-carving machine. Below, we break down exactly what performance gains you can expect, along with technical details, installation considerations, and real-world driving impressions.

Understanding Stock Suspension Limitations

The factory ND Miata strikes a balance between comfort and handling, but compromises are inevitable. Stock dampers are tuned with soft valving to absorb road imperfections, leading to noticeable body roll during aggressive cornering. The OE springs prioritize ride quality over ultimate grip, and the factory sway bars are relatively thin to maintain compliance. On track or during spirited back-road driving, these traits can limit lateral grip and cause unsettled weight transfer, especially under braking and acceleration. Common complaints include excessive pitch under hard braking and a tendency to understeer at the limit. Upgrading the suspension addresses these weaknesses by providing stiffer, adjustable components that keep the tires planted.

What Coilovers Offer

Coilover systems replace the separate spring and shock assembly common on many cars with a single, integrated unit. This allows for ride height adjustment independent of spring preload, and often provides adjustable damping (rebound and compression). For the ND Miata, coilovers offer three major advantages over basic shock-and-spring upgrades:

  • Lower center of gravity: Reduced ride height (typically 0.5–1.5 inches lower than stock) improves both aerodynamics and weight transfer behavior.
  • Fine-tuned damping: Adjustable rebound and compression settings let drivers tailor the suspension to specific surfaces or driving styles—softer for daily driving, stiffer for track sessions.
  • Higher spring rates: Aftermarket coilovers use stiffer springs (often 7kg/mm front and 4kg/mm rear or similar) to minimize body roll and maintain camber throughout the travel range.

Key Features of Voodoo13 Coilovers

Voodoo13 coilovers are specifically engineered for the ND Miata chassis, with valving and spring rates matched to the car’s weight and geometry. Notable design elements include:

  • High-flow monotube dampers: Provide consistent damping performance under sustained load, reducing fade during extended track sessions.
  • Independent ride height adjustment: Height is adjusted via a threaded lower mount, so ride quality is not compromised when lowering the car.
  • 32-click damping adjustment: A wide range of settings from comfort to competition, allowing precise control over rebound and compression.
  • Durable construction: CNC-machined aluminum bodies and robust seals ensure longevity in harsh environments. Voodoo13 also offers stainless steel hardware to resist corrosion.
  • Spring rate options: Multiple spring rate choices (e.g., 6k/4k for street, 8k/6k for aggressive track use) so owners can match the setup to their driving needs.

These features directly address the ND Miata’s stock weaknesses by providing a stiffer, more controllable suspension platform. Drivers typically report a reduction in lean angle of 40–60% compared to stock, along with much quicker transient response when transitioning between left and right corners.

The Role of Sway Bars

Sway bars (also called anti-roll bars) resist body roll by connecting the left and right wheels via a torsion spring. Increasing the bar stiffness has two primary effects: it reduces body roll angle and shifts the balance of grip between the front and rear axles. On the ND Miata, a stiffer front bar can reduce understeer, while a stiffer rear bar can induce more oversteer rotation. However, going too stiff can cause inside-wheel lift or reduce overall mechanical grip on uneven surfaces.

Upgraded sway bars for the ND Miata are typically hollow or solid with diameters ranging from 22mm to 27mm (front) and 16mm to 18mm (rear). Compared to the stock 21mm front and 11mm rear bars, aftermarket pieces significantly increase roll stiffness. The result is flatter cornering and more predictable weight transfer, which translates to higher cornering speeds and less steering wheel input needed mid-corner.

Upgraded Sway Bar Options for the ND Miata

Common choices complementing Voodoo13 coilovers include bars from Flyin’ Miata, Goodwin Racing, and Karcepts. Key considerations when selecting bars:

  • Material and construction: Hollow bars save weight while offering stiffness; solid bars are heavier but very durable.
  • Adjustability: Multi-hole end link mounts allow tweaking the effective bar stiffness—three or four settings are typical.
  • Compatibility with aftermarket coilovers: Some bars require different end links or clearance modifications; always verify fitment.
  • Balance: Many ND owners pair a 25mm front bar with a 14–16mm rear bar to maintain a neutral or slight oversteer bias.

Paired with Voodoo13 coilovers, upgraded sway bars allow drivers to fine-tune the handling balance independent of spring rates. For example, if the chassis feels too prone to understeer after coilover installation, increasing rear bar stiffness (or softening the front) can rotate the car more readily.

Synergistic Gains from Combined Upgrades

Installing coilovers and sway bars together yields performance benefits beyond the sum of their parts. The stiffer springs and monotube dampers control vertical motion and maintain tire contact patch, while the sway bars limit roll angle so that the springs can focus on absorbing bumps. This complementary relationship results in:

  • Higher lateral acceleration: Many ND Miatas achieve 0.95–1.00 g on skidpad with stock tires; with Voodoo13 coilovers and upgraded sway bars, numbers often climb above 1.05 g on sticky street tires and above 1.15 g on semi-slicks.
  • Improved autocross and track lap times: Owners report reductions of 2–4 seconds on a 60-second autocross course and 3–5 seconds per lap on typical 2-mile road courses compared to stock suspension.
  • More consistent performance: The enhanced damping control reduces oscillation after bumps, so lap times become more repeatable over a session.
  • Better camber control: Adjustable coilovers allow for negative camber settings (-2° to -3° front, -1.5° to -2.5° rear) that maximize tire contact during cornering. Combined with reduced body roll, the tires stay at optimal camber throughout the turn.

Expected Performance Metrics

To give a concrete idea of gains, here are typical before-and-after figures from ND Miatas equipped with Voodoo13 coilovers (8k/6k springs) and 25mm front / 16mm rear sway bars:

  • Slalom speed (700 ft): Stock ~58 mph; upgraded ~63 mph
  • Skidpad average: Stock 0.92 g; upgraded 1.04 g (on 200-treadwear tires)
  • Body roll (degrees at 1 g): Stock ~5°; upgraded ~2°
  • Brake dive reduction: 40% less forward pitch under heavy braking
  • Steering response time (slalom): Improved by ~0.1 seconds per gate

Note that actual results depend on alignment, tire compound, and driving skill. However, the trend is clear: the combination transforms the ND Miata from a playful tourer into a serious performance tool.

Installation and Setup

While many experienced DIYers can install coilovers and sway bars in a weekend, professional help ensures correct preload, corner weighting, and alignment. Key steps and considerations:

  • Ride height setting: Voodoo13 coilovers allow height adjustments independent of spring preload. A common starting point is 13.0 inches front and 13.5 inches rear (center of wheel to fender lip). Lower settings improve handling but may require shorter end links and can cause scraping on steep driveways.
  • Sway bar installation: Upgraded bars often use polyurethane bushings that must be greased to prevent squeaks. Some bars require drilling new mounting holes or using extended end links to avoid binding with lowered ride heights.
  • Alignment after installation: Any ride height change alters camber and toe. A proper alignment is essential to avoid uneven tire wear and to maximize grip.
  • Corner balancing: For track use, corner weighting equalizes the load on each tire, improving consistency and reducing understeer bias from diagonal weight jacking.

After lowering with Voodoo13 coilovers, aim for the following alignment numbers (street setting with mild track use):

  • Front camber: -1.8° to -2.2°
  • Rear camber: -1.5° to -2.0°
  • Front toe: 1/16” to 1/8” total toe-out (0 to 0.2° total)
  • Rear toe: 1/16” to 1/8” total toe-in (0.1° to 0.2° total)
  • Caster: As much as the adjusters allow (typically 7°–8°)

These settings work well for most combined street/autocross driving. For dedicated track use, more negative camber (up to -3°) and less toe-out can improve turn-in stability.

Maintenance Considerations

Voodoo13 coilovers are designed for durability, but periodic checks are recommended:

  • Clean threads and adjusters: Dirt can jam the height collars; apply anti-seize compound annually.
  • Check end links: Upgraded sway bars put more stress on end links; inspect for play every 5,000 miles or after track events.
  • Monitor damping adjusters: Ensure clickers remain consistent; if they become notchy, service may be needed.
  • Rebuild intervals: Monotube dampers typically last 30,000–50,000 miles before needing a rebuild; professional service is available through Voodoo13 or authorized shops.

With proper maintenance, the system provides many years of high-performance service.

Driving Impressions

After upgrading to Voodoo13 coilovers and sway bars, the ND Miata’s character changes dramatically. At first touch, the stiffer springs and higher damping rates translate to a firmer ride over bumps, but the monotube valving keeps it from being harsh. Minor road imperfections are absorbed without bouncing the car off-line. On smooth pavement or track, the car feels planted and eager.

Turn-in sharpness is the most immediate gain. Initial steering input produces an immediate change in direction with almost no delay—a quality that autocrossers prize. Mid-corner, the chassis maintains a flat attitude even when carrying significant speed, inspiring confidence to brake later and trail-brake more aggressively. Weight transfer becomes predictable, allowing the driver to rotate the car with throttle input rather than waiting for the suspension to settle.

The upgraded sway bars reduce the wallowing feeling that stock ND Miatas exhibit in fast transitions. Back-to-back lane changes at highway speeds feel tight and controlled, with no secondary oscillations. On track, the car’s ability to hold a line through long sweepers improves markedly: understeer is replaced by mild push that can be tuned out with sway bar adjustments.

For daily driving on rough roads, some may find the ride too firm if the dampers are set to full stiff. However, the wide adjustability range allows dialing in a comfortable setting for commuting and then cranking it up for weekend track days. This versatility is a major selling point of the Voodoo13 system.

Conclusion

Upgrading your ND Miata with Voodoo13 coilovers and matched sway bars delivers measurable performance gains: flatter cornering, higher lateral grip, quicker steering response, and more consistent lap times. The combination addresses the factory suspension’s compromises while retaining daily-driver usability through adjustable damping. Whether your goal is competing in autocross, setting personal bests on road courses, or simply enjoying tighter back roads, this suspension package provides the foundation for serious driving enjoyment. As with any performance upgrade, proper installation and alignment are crucial to unlocking the full potential. For those ready to take their ND Miata to the next level, Voodoo13 coilovers and upgraded sway bars represent a proven, high-value investment.

Looking for more details? Check out resources such as Voodoo13’s official ND Miata coilover page, Flyin’ Miata’s suspension guide, and Goodwin Racing’s ND suspension section for product options and technical data.