The KW V3 coilover system is one of the most respected aftermarket suspension upgrades for the Audi S5 3.0T, offering a blend of refined daily drivability and serious track capability. For owners looking to reduce body roll, improve steering response, and dial in the perfect ride height, this installation delivers measurable gains. This guide provides a comprehensive look at the engineering behind the kit, a detailed step-by-step installation, tuning advice, and a full cost breakdown so you can plan your project with confidence.

What Makes KW V3 Coilovers Ideal for the S5 3.0T?

The Audi S5 3.0T (B8/B8.5 generation, 2009–2016) comes from the factory with a sport-oriented suspension that still prioritizes comfort. While adequate for most drivers, it leaves performance on the table. The KW V3 system addresses this with race-bred technology engineered for the chassis. The key differentiator is the independent adjustment of compression and rebound damping – a feature typically found on far more expensive coilovers. This allows you to fine-tune low-speed compression for bump absorption while independently setting high-speed rebound for control over larger pavement undulations.

KW uses a patented stainless steel technology for the damper body, which resists corrosion far better than painted or coated alternatives. The threaded shock body and adjustable spring perches provide a wide range of ride height adjustment (typically 20–50 mm drop) without affecting spring preload, keeping the suspension operating in its ideal travel window. For the S5’s heavy front end, the progressive-rate springs are matched to the car’s weight distribution, preventing premature bottoming while maintaining daily comfort.

Key Engineering Details

  • Independent Valve Technology: Separate adjustment circuits for compression and rebound – 16 clicks each allow precise tuning for street or track.
  • Stainless Steel Body: Meets DIN 50021 SS corrosion resistance standards, essential for regions with road salt.
  • TÜV Certification: KW V3 coilovers have passed German technical inspection, ensuring they meet safety and durability requirements.
  • Height Adjustment Range: Front: 20–55 mm drop; Rear: 20–50 mm drop (depending on subframe configuration).

For official specifications and vehicle fitment, consult the KW V3 product page for the Audi S5.

Pre-Installation Considerations

Before lifting your S5, a few critical decisions directly affect ride quality, cost, and safety. Failing to plan these will result in an incomplete build.

Spring Rates and Vehicle Weight

The stock KW V3 kit for the S5 3.0T comes with progressive-rate springs. Front spring rate is approximately 60–80 N/mm (progressive) and rear is 40–60 N/mm. If you plan to use the car heavily on track, consider upgrading to KW’s optional linear-rate springs (available for track day use). The S5 3.0T weighs roughly 1,700 kg (3,750 lbs) with a front-heavy bias, so stiffer springs can reduce brake dive but may compromise comfort.

Tools and Parts Checklist

  • Floor jack and four jack stands
  • Torque wrench (½‑inch drive, 10–150 ft·lb range)
  • 18 mm, 19 mm, 21 mm sockets and combination wrenches
  • Spring compressor (for safe removal of OEM strut assemblies)
  • Allen key set (for damping adjustment knobs)
  • Thread-locking compound (medium strength, e.g., Loctite 243)
  • Anti-seize compound (for shock body threads)

Optional Replacements During Installation

While the coilovers come with new bump stops and dust boots, it’s wise to replace these additional wear items while the suspension is apart:

  • Top mount bearings: Front strut mounts and rear shock mounts (often worn on higher mileage S5s).
  • Sway bar end links: The stock plastic links are prone to failure – upgrade to adjustable metal links for less roll.
  • Subframe and control arm bolts: Audi uses single-use stretch bolts – replace them to maintain clamping torque.

A detailed forum resource for part numbers and torque specs is available on Audizine’s KW V3 install thread.

Installation Process Step-by-Step

Important: Always use jack stands and chock the rear wheels. Never work under a vehicle supported only by a hydraulic jack. Follow torque specifications from Audi’s repair manual (typically 30 N·m + 90° for lower strut bolts, 20 N·m for top mount nuts).

Front Suspension Removal and Installation

  1. Secure the vehicle: Lift the front and place jack stands under the frame rails. Remove the front wheels.
  2. Disconnect sway bar end link: Use an 18 mm socket on the ball joint hex while holding the stud with a 6 mm Allen key. Remove the link from the strut.
  3. Unbolt brake line bracket: The OEM brake hose is attached to the strut. Remove the clip or 10 mm bolt to free it – do not disconnect the brake line.
  4. Remove upper strut mount: Access the three 13 mm nuts from the engine bay (two on top of the strut tower, one behind the cowl). Remove them with a wobble extension.
  5. Remove lower strut bolts: Using a 18 mm socket and breaker bar, remove the two horizontal bolts securing the strut to the steering knuckle. Carefully pull the strut downward and out.
  6. Assemble KW V3 coilover: Transfer the top mount bearing (if reusing) to the new KW strut. Use thread locker on the top nut. Set ride height adjustment per KW’s included instructions (initial setting typically 30 mm drop front, 25 mm drop rear).
  7. Install KW coilover: Slide the assembly into position, loosely bolt the top mount nuts, then insert the lower bolts into the knuckle. Torque lower bolts to 30 N·m + 90° (final angle). Torque top mount nuts to 20 N·m.
  8. Reattach sway bar link: Ensure the link is at a near‑90° angle to the control arm. Hand tighten, then torque to 50 N·m while holding the stud.
  9. Reattach brake line bracket and wheel.

Rear Suspension Removal and Installation

  1. Raise the rear and place stands under the rear subframe. Remove wheels.
  2. Remove the lower strut bolt (18 mm) from the knuckle.
  3. Access the top mount from inside the trunk (remove trunk side carpet panels). Use a 16 mm deep socket to remove the top nut.
  4. Remove the OEM shock/spring assembly. Use a spring compressor if you are retaining any components – for a complete swap, simply compress and disassemble outside the car.
  5. Install the KW rear coilover into the supplied sleeve (adjustable spring seat at bottom). Tighten the top mount nut to 15 N·m, loctite applied.
  6. Guide the coilover into the lower knuckle, install the bolt, and torque to 60 N·m.
  7. Reinstall wheel, lower car, and repeat for the other side.

Note on drive shafts: On the rear of the S5, ensure the coilover’s spring runs parallel to the half shaft – misalignment can cause rubbing at full droop.

Alignment and Corner Weight

After installation, you must get a four‑wheel alignment. The S5’s front and rear camber is adjustable via eccentric bolts on the lower control arms. Aim for these specs as a starting point:

  • Camber front: −1.0° to −1.5° (street) or −2.0° to −2.5° (track)
  • Camber rear: −1.0° to −1.2°
  • Toe front: 0° to +0.05° total (slight toe‑in)
  • Toe rear: +0.10° to +0.15° total (toe‑in for stability)

If you have access to scales, corner balancing will maximize grip consistency. Adjust the ride height perch on each corner to achieve a 50/50 cross weight (left front + right rear = right front + left rear).

Tuning the KW V3 Damping

The magic of KW V3 is the ability to dial in compression and rebound independently. For initial setup, KW recommends 8 clicks from full hard for both compression and rebound on the S5. From there, you can tweak to preference:

  • For a smoother street ride: Soften rebound 2 clicks and compression 1 click (e.g., 10 rebound, 9 compression).
  • For aggressive backroad driving: Stiffen rebound 1 click, compression 2 clicks (e.g., 7 rebound, 6 compression).
  • For autocross or track: Start at 6 rebound, 4 compression. Adjust based on understeer vs oversteer.

Use the small red adjustment knobs located at the top of the shock shaft (rebound) and at the bottom of the shock body (compression). Always turn them with a gentle hand – do not force past the detent.

For a deeper dive into tuning theory, refer to Race Tech’s suspension tuning guide.

Handling Improvements: Measured and Felt

Owners consistently report transformative changes after installing KW V3 coilovers on the S5 3.0T. The OEM setup allows 2.2° of body roll on a standard skidpad – with the KW V3 at moderate damping, roll drops to 1.5°. On a 45‑mph slalom, steering response improves by approximately 0.3 seconds due to reduced delay in weight transfer.

More importantly, the independent damping control means you can run softer compression over rough pavement without sacrificing roll control, an impossible trade‑off with fixed-valve struts. On the S5’s heavy nose, this translates to more consistent braking and turn‑in accuracy.

Some drivers have logged lap time reductions of 2–3 seconds per minute on road courses purely from suspension changes. While tires are a factor, the KW V3 coilovers eliminate the vagueness that plagues the stock suspension at the limit.

Cost Breakdown and Budgeting

Below is a realistic estimate for a complete KW V3 installation on an Audi S5 3.0T. Prices vary by region and retailer, but this reflects current market averages (2024–2025).

ItemEstimated Cost (USD)
KW V3 coilover kit (front & rear)$2,150 – $2,400
Top mount bearings (both front)$80 – $150
Rear shock mounts (pair)$60 – $100
Sway bar end links (optional)$100 – $200
Alignment and corner balance$150 – $300
Labor (if not DIY, 6–8 hours)$600 – $1,000
Miscellaneous (bolts, thread locker)$30 – $50
Total (DIY, no extras)$2,390 – $2,800
Total with labor and all optional parts$3,200 – $4,000

Savings tip: Installation is straightforward for a competent DIYer, saving you $600–$1,000. However, the alignment and corner balance are best left to a professional shop with experience in high‑end coilovers.

Alternative Cost Considerations

  • If your S5 has magnetic ride (adaptive damping), you will need a module or resistor kit to clear the dash code – add $50–$150.
  • Consider a set of adjustable camber plates if you need more than −2.0° front camber (approx. $250).
  • Used KW V3 kits can be found for $1,200–$1,600 but require inspection for damage and seal leakage.

For current pricing, check Tire Rack’s KW V3 listings.

Long-Term Maintenance and Common Issues

Properly installed KW V3 coilovers are robust, but a few points need attention for long service life:

  • Upper mount noise: If you hear a clunking over bumps after 1–2 years, the top mount bearing may have worn. Replace with a brass or upgraded bearing.
  • Adjustment knob dirt: The compression knob at the bottom of the shock is exposed to road debris. Clean it regularly with compressed air to prevent grit from being pushed into the seal.
  • Corrosion on coilover threads: While the shock body is stainless, the lower threaded collars are aluminum. Use anti-seize annually to prevent galling when adjusting ride height.
  • Seal leakage: KW offers a rebuild service for approximately $150 per shock. Do not attempt to disassemble the damper – it’s nitrogen‑pressurized.

If you track the car, consider checking the damping fluid every 15,000 miles or once a season. KW V3 systems are fully rebuildable, a major advantage over cheaper assemblies.

Conclusion

The KW V3 coilover system transforms the Audi S5 3.0T from a comfortable grand tourer into a responsive, communicative sports car. The ability to independently adjust compression and rebound lets you find a sweet spot that works for your daily commute and your weekend track day. The installation is achievable for a competent enthusiast, and the long‑term benefits in handling precision and driver confidence are well worth the investment. With proper planning – including budgeting for alignment, replacement top mounts, and potential tools – you can complete the project and experience exactly why the S5 chassis responds so well to quality coilovers.