Best Suspension Mods to Complement Your BRZ FA20 Power Upgrade for Better Handling

The Subaru BRZ, with its lightweight chassis and horizontally opposed FA20 engine, has long been celebrated as a driver’s car straight from the factory. But once you start adding power—whether through forced induction, headers, or a stage tune—the stock suspension can become the weak link. Without proper chassis support, extra horsepower translates to wheel spin, excessive body roll, and reduced driver confidence. This guide covers the most effective suspension upgrades to turn your BRZ into a true handling weapon. We’ll explore coilovers, sway bars, braces, camber adjustments, and the supporting modifications that ensure every pound of boost is planted to the tarmac.

Why Power Alone Isn’t Enough: The Importance of Chassis Tuning

Adding 50–100 horsepower to the FA20 without addressing suspension creates a car that is faster in a straight line but slower through corners. The BRZ’s MacPherson strut front and double-wishbone rear suspension are well engineered, but they are designed for the stock power level. Once torque increases, the car exhibits more understeer on corner entry and more oversteer on exit, depending on alignment and tire grip. Upgrading the suspension ties the chassis together, allowing the increased power to be used effectively.

Key benefits of a properly tuned suspension system include:

  • Reduced body roll — stiffening the chassis keeps the tires’ contact patches flat during cornering.
  • Improved traction under acceleration — controlling squat and weight transfer prevents wheel hop.
  • Better braking stability — a stiffer suspension reduces dive and maintains consistent tire loading.
  • Driver feedback — quality components transmit road feel so you can adjust your driving inputs.

Coilovers: The Foundation of a Track-Ready BRZ

Coilover systems replace both the spring and damper with a single adjustable unit. For the BRZ, coilovers are the single most impactful suspension upgrade. They allow you to lower the car’s center of gravity, adjust damping for different conditions, and often incorporate camber plates for fine-tuning alignment. Popular choices include the BC Racing BR Series, Fortune Auto 500 Series, and Tein Flex Z.

Selecting the Right Spring Rate

Spring rate is measured in pounds per inch (lb/in). A dual-purpose street/track BRZ typically works well with front rates around 7–8k (392–448 lb/in) and rear rates of 6–7k (336–392 lb/in). Stiffer rates (10k front / 8k rear) suit dedicated track cars but sacrifice daily comfort. Many coilovers offer threaded spring perches, so you can swap springs later if needed.

Adjustable Damping

High-end coilovers provide separate compression and rebound adjustment. This lets you dial in the car’s response to bumps and transition weight transfer. For the BRZ, a good starting point is to follow the manufacturer’s recommended settings, then adjust based on track conditions. Softer low-speed compression helps maintain traction over curbing; stiffer high-speed compression controls large dips.

Sway Bars: Controlling Body Roll Without Sacrificing Ride Comfort

Sway bars (anti-roll bars) connect the left and right suspension components, reducing lean in turns. Upgrading them is a cost‑effective way to increase cornering grip. A Whiteline adjustable rear sway bar paired with a slightly stiffer front bar is a popular combination for the BRZ. The goal is to keep the chassis flat without making the car too tail-happy. Rear bar adjustments allow you to dial in oversteer or understeer tendency.

Recommended sway bar upgrades:

  • Whiteline Adjustable Sway Bars — multiple holes for fine-tuning bar stiffness.
  • ST Suspension Sway Bars — European tuning heritage, excellent for street and track.
  • Cusco Front and Rear Sway Bars — lightweight, race-proven design.

Strut Braces and Chassis Reinforcement

The BRZ’s unibody is stiff but can still flex under high cornering loads and when running wide tires. Strut braces connect the top of the suspension towers, reducing chassis twist and improving steering precision. Adding a front strut brace is one of the quickest handling mods you can perform. Rear strut braces also help stiffen the trunk area, especially if you’ve removed sound deadening or added a rear seat delete. Top picks include Cusco Front Strut Brace, Whiteline Strut Tower Brace, and Torque Solutions Rear Strut Brace.

Camber Kits: Unlocking Maximum Tire Grip

Negative camber (tilting the top of the tire inward) increases contact patch during cornering. Stock BRZs run about –1.0 degree front camber. For aggressive street or track use, you will want –2.5 to –3.5 degrees up front. Adjustable camber bolts or full camber plates (often included with coilovers) are required. Rear camber can also be adjusted with aftermarket arms. SPC Performance and Whiteline offer well-engineered camber kits.

Alignment Basics for Power-Upgraded BRZs

After installing coilovers, sway bars, and camber kits, get a proper alignment. Typical specs for a fast road/track BRZ with power mods are:

  • Front camber: –2.5° to –3.0°
  • Front toe: 0 to 1/16” toe out (for turn-in response)
  • Rear camber: –1.5° to –2.0°
  • Rear toe: 1/16” to 1/8” toe in (for straight-line stability)

A well-sorted alignment ensures the tires wear evenly and maximizes the grip potential of any power upgrade.

OEM rubber bushings deflect under load, introducing slop. Upgrading to polyurethane or spherical bearings in control arms and sway bar end links sharpens response. Whiteline and SuperPro offer comprehensive bushing kits for the BRZ. Replacing the front lower control arm rear bushings and the steering rack bushings drastically reduces on-center vagueness. This is especially noticeable after an engine tune increases torque delivery.

Tires: The Only Contact Patch That Matters

No suspension mod can overcome poor tires. For a BRZ making 250+ whp, invest in high-performance summer tires like the Michelin Pilot Sport 4S or Bridgestone Potenza RE‑71RS. Extremely sticky tires will overwhelm the chassis if springs and damping aren’t set correctly, so match tire grip with suspension stiffness. A track‑focused BRZ may run 200‑tw tires; a street car benefits from 300‑tw compounds for daily usability.

If you drop the car more than 1.5 inches, check for tire clearance and fender rolling. Many BRZ owners run 245/40R17 or 255/40R17 on 17×9 inch wheels for optimal grip without excessive rubbing.

Budget Considerations and Prioritization

Suspension upgrades can quickly become expensive, so it helps to prioritize:

  1. Coilovers — spend the most here; they provide the greatest handling improvement.
  2. Sway bars — relatively low cost, big impact on body roll.
  3. Tires — without grip, nothing else matters.
  4. Camber adjustments — necessary after lowering to prevent uneven wear and maximize cornering.
  5. Bushings and braces — fine-tuning for ultimate response.

If your budget is tight, start with a good set of coilovers, align the car, and drive it. You can later add sway bars and braces as funds allow. Avoid cheap coilovers with unknown damping characteristics; they often ruin ride quality and can even be dangerous at high speeds.

Putting It All Together: A Sample Build for 350 WHP

Imagine a BRZ with a supercharger kit producing 350 whp. The suspension needs to handle nearly double the factory torque. Here’s a cohesive setup:

  • Coilovers: Fortune Auto 500 with 8k front / 7k rear springs.
  • Sway bars: Whiteline adjustable front and rear (set to middle setting).
  • Braces: Cusco front strut brace and Torque Solutions rear brace.
  • Camber: –3.0° front, –2.0° rear via Whiteline camber bolts and SPC rear arms.
  • Tires: 255/40R17 Hankook Ventus R‑S4 on 17×9.5 inch wheels.
  • Bushings: SuperPro polyurethane lower control arm and steering rack bushings.

With this setup, the car will pull hard out of corners and inspire confidence at triple‑digit speeds. The driver can adjust damping for track days and soften it for weekend drives.

Common Mistakes to Avoid

Enthusiasts often fall into traps when upgrading:

  • Over‑lowering: Dropping the car too much can cause the suspension to bottom out on the bump stops, losing all grip. Keep at least 1 inch of suspension travel.
  • Ignoring sway bar end links: Factory end links are plastic and can snap after lowering. Upgrade to metal adjustable end links.
  • Mixing spring rates incorrectly: Drastically different front-to-rear spring rates can upset balance. Use rates within 1k of each other unless you have a specific track setup.
  • Neglecting corner balancing: After installing coilovers, a corner weight adjustment helps the car sit evenly on all four tires, improving turn-in consistency.

Conclusion

Upgrading the suspension on your BRZ FA20 is not optional if you want to fully realize the benefits of a power upgrade. Coilovers, sway bars, strut braces, camber kits, tires, and bushings all contribute to a cohesive handling package that puts the extra horsepower to the ground. Whether you daily drive the car or compete in time attack events, a well‑sorted suspension transforms the BRZ from a fun coupe into a serious performance machine. Start with the foundation—coilovers and alignment—then layer in the details. Your BRZ will reward you with sharper reflexes, faster lap times, and a grin that never fades.

For further reading, check out the FT86 Club suspension forum, Countersteer’s BRZ suspension guide, and Tire Rack’s suspension overview for real-world insights.