Mastering Track Performance: Upgrading Suspension Bushings and Coilovers for the FL5 Civic Type R

The FL5 Civic Type R arrives from the factory with a chassis that already feels razor-sharp. Honda’s engineers tuned the suspension to deliver phenomenal grip and balance for both street and occasional lapping. However, dedicated track day drivers often push beyond the stock limits. Factory bushings allow some compliance for ride comfort, and the standard coilovers lack the fine-tuned adjustability needed for consistent lap times. Upgrading both bushings and coilovers transforms the FL5 into a true track weapon, unlocking sharper turn-in, better corner exit traction, and a more predictable rear end.

This guide explains how these upgrades work together, the specific benefits for your FL5, and what to consider when selecting and installing parts. Whether you are a weekend warrior or building a time-attack machine, understanding suspension bushings and coilovers will help you make informed decisions.

Why Bushings Matter: The Foundation of Handling

Every pivot point in your suspension—control arms, trailing arms, sway bar links—relies on bushings. Stock rubber bushings are designed to absorb road imperfections and reduce noise, vibration, and harshness (NVH). Under hard cornering or braking, rubber compresses and deflects, introducing slop. This delay between steering input and tire response is magnified on track, where precision matters.

Upgrading to stiffer bushings reduces deflection, keeping the suspension geometry consistent. The result: the suspension moves exactly as intended, with no unwanted compliance. Track-focused bushings also maintain alignment under load, preventing dynamic toe changes that cause understeer or instability at corner entry.

Types of Performance Bushings for the FL5

Several bushing materials exist, each offering different trade-offs between stiffness and comfort.

  • Polyurethane bushings: A popular step up from rubber. Polyurethane is more rigid but still retains some compliance for daily driving. It reduces deflection noticeably while adding minimal NVH. Brands like Hardrace and Whiteline offer FL5-specific polyurethane kits for front lower control arms, trailing arms, and sway bars.
  • Spherical bearings (pillow ball): These replace the rubber element with a metal housing and a spherical bearing. They offer zero compliance, delivering the most precise steering and suspension movement. Spherical bearings are common in race cars and time-attack builds, but they transmit more road noise and vibration into the cabin. They also require periodic maintenance and are less forgiving on rough tracks.
  • Delrin or aluminum bushings: Solid inserts made from rigid materials. Delrin offers a good compromise between spherical bearings and polyurethane—nearly zero deflection with less harshness than metal-to-metal contact. Aluminum bushings are typically used in full-race applications where weight savings and maximum stiffness are priorities.

Which Bushings to Upgrade First?

On the FL5, the rear trailing arm bushings and front lower control arm bushings are primary upgrade points. The rear trailing arm bushing flexes under braking and cornering, causing the rear axle to steer slightly (toe steer). Replacing it with a stiffer bushing dramatically improves stability under braking and power application. The front LCA bushings affect caster and camber stability; stiffer bushings keep the wheel from toeing out during hard turning.

Sway bar bushings are another easy upgrade—replacing the rubber sway bar mounts with polyurethane reduces bar deflection, making the sway bar more effective without increasing its stiffness.

Coilover Systems: Taking Control of Your FL5’s Height and Damping

Stock FL5 coilovers are decent for a production hot hatch, but they lack the adjustability needed to optimize a track setup. Coilovers replace the entire spring and damper unit, allowing you to adjust ride height and often damping characteristics independently.

Benefits Beyond Lowering

While lowering the center of gravity is a key advantage, modern coilover systems offer more nuanced benefits:

  • Adjustable ride height: You can dial in a specific front-to-rear rake, improve weight transfer, and lower the chassis without sacrificing suspension travel.
  • Separate rebound and compression damping: Higher-end coilovers allow independent adjustment of low-speed and high-speed compression, plus rebound. This fine-tuning lets you optimize the car for smooth tracks, bumpy circuits, or intermediate conditions.
  • Improved damper performance: Aftermarket dampers use better valving, larger shafts, and higher-quality oils to resist fade during extended lapping. The FL5’s stock dampers can overheat after three or four hot laps, leading to reduced control.
  • Corner-weighting capability: With adjustable perches, you can corner-weight the car to balance the diagonal loads, improving traction and rotation.

Choosing the Right Coilover for Track Use

The FL5 has a wide aftermarket support. Consider these key factors:

  • Spring rates: Track-oriented cars typically need stiffer springs than street setups. Look for rates between 8–12 kg/mm (448–672 lbs/in) front and 6–10 kg/mm (336–560 lbs/in) rear. Softer springs help on bumpy tracks, but too soft causes excessive body roll and nose dive.
  • Monotube vs. Twin-tube: Monotube dampers offer better heat dissipation and more consistent damping, ideal for track use. Twin-tube designs are cheaper but prone to fade under sustained abuse.
  • Inverted dampers: Some coilovers (e.g., Öhlins Road & Track) use an inverted design where the damper body slides inside the spring. This reduces unsprung weight and stiffens the damper body, but can be more expensive.
  • Top mounts: Some coilovers include pillow ball top mounts that provide camber adjustment. This is extremely helpful for dialing in negative camber on the FL5—the stock front geometry maxes out around –1.5 degrees, while track drivers often seek –2.5 to –3.5 degrees for even tire wear and peak cornering grip.

Reputable manufacturers for the FL5 include KW Automotive (Clubsport or V3), Öhlins (Road & Track DFV), BC Racing (BR type), and Tein (Flex Z or Mono Sport).

Installation and Alignment: Getting It Right

Installing bushings and coilovers on the FL5 is not a beginner job, but a competent DIYer with the right tools can handle it. Pressing old bushings out requires a ball joint press or a hydraulic press. Coilover replacement is more straightforward: remove the strut assembly, swap the spring and damper unit, and reinstall.

After installation, a precision alignment is mandatory. For track use, start with these baseline settings:

  • Front camber: –2.5 to –3.0 degrees (with adjustable top mounts or camber plates)
  • Rear camber: –1.5 to –2.0 degrees (factory adjustability may be sufficient)
  • Front toe: 0 to 1/16 inch toe out (improves turn-in)
  • Rear toe: 1/16 to 1/8 inch toe in (stability)

Corner-weight the car if possible. This ensures each tire carries equal diagonal weight, maximizing grip in corners and brake balance.

Track Day Setup: Tuning for the Session

Once you have the hardware installed, the real work begins: tuning the suspension to suit the track and your driving style.

Damping Settings

Start with the manufacturer’s suggested soft or baseline setup. From there:

  • If the car understeers (pushes): Soften the front rebound or stiffen the rear rebound. Also, increase front compression slightly to reduce weight transfer to the inside rear.
  • If the car oversteers (rotates too much): Stiffen the front rebound or soften the rear rebound. Reduce rear compression to give the rear tire more compliance.
  • If the car bounces after bumps: Increase rebound damping. If the car feels harsh and skips over ripples, soften compression.

Take notes—each track and temperature affects damper behavior. A high-speed circuit like Road America demands different settings than a technical track like Mid-Ohio.

Ride Height and Rake

Lower the car approximately 1–1.5 inches from stock (25–40 mm). Aim for a slight front rake: the front lower than the rear by 5–10 mm. Rake improves aero balance and helps the front end bite during turn-in.

Check suspension travel. After lowering, ensure the bump stops don't make contact during full compression. If they do, raise the car or use shorter bump stops.

Common Mistakes to Avoid

Even with quality parts, mistakes can ruin the experience. Here are pitfalls specific to the FL5:

  • Ignoring bump steer: After lowering, the tie rod angle changes, potentially causing bump steer. Toe adjustments can mask it, but proper bump steer correction via steering rack spacers or tie rod ends yields a more predictable car.
  • Over-tightening bushings: When installing new bushings, tighten the bolts only after the car is on the ground with the suspension under load. Tightening while lifted preloads the bushings, causing premature wear and binding.
  • Combining too stiff spring rates with soft bushings: If you install race springs but keep soft rubber bushings, the bushings deflect under load, negating the spring stiffness. Always upgrade bushings first or in conjunction.
  • Neglecting sway bars: Stiffer bushings alone won't transform roll control. Consider upgrading the front and rear sway bars to match the coilover spring rates. The FL5’s rear sway bar is already stiff, but an adjustable bar lets you fine-tune balance.

Maintenance After Upgrades

Track use accelerates wear. Inspect bushings for tears, especially polyurethane (they can shrink and become brittle over time). Spherical bearings need periodic cleaning and greasing. Coilover dampers should be checked for leaks after every few track days—wipe down the damper shaft and look for oil film.

Re-torque suspension bolts after the first track session: new parts settle, and fasteners may loosen. Use thread-locker where recommended.

Wrap-Up: A Track-Ready FL5

Upgrading suspension bushings and coilovers on the FL5 Civic Type R is not about discarding Honda’s engineering—it’s about refining it for a specific purpose. Stiff bushings eliminate compliance, letting the chassis translate driver inputs to tire contact patches more directly. Coilovers offer the adjustability to tune spring rates, ride height, and damping for any circuit. Together, they reduce lap times, improve consistency, and increase driver confidence.

Start with bushings on the rear trailing arm and front lower control arms, then choose coilovers that match your budget and adjustability needs. Pair them with a proper alignment and corner-weight session, and you will have a car that rewards precise driving on track day.

For those seeking further community knowledge, forums like CivicXI and Honda-Tech offer build threads and data from other FL5 owners. Always verify that parts are specifically designed for the FL5—some CTR parts from the FK8 share compatibility, but suspension geometry differs.

Proper preparation beats a powerful engine every time. With upgraded bushings and coilovers, your FL5 will handle corners like a high-strung race car—and you will leave the straights behind knowing you have the grip to carry speed through every bend.