Why Coilover Adjustments Matter for Performance Driving

Coilover suspensions have become the go-to upgrade for drivers who want more than a simple lowering spring. By combining a shock absorber and spring into a single, adjustable unit, coilovers let you fine-tune ride height, damping force, and spring preload independently. The three brands we’ll focus on — Ohlins, Tein, and Eibach — represent different tiers of performance and budget, but all reward careful adjustment. Getting the settings right transforms how your car handles corners, brakes, and absorbs imperfections. Getting them wrong can degrade traction, upset balance, and even cause premature wear. This guide explains the adjustment principles behind each brand and gives you a repeatable process to dial in maximum performance on street or track.

Core Principles of Coilover Tuning

Before diving into brand-specific advice, it’s essential to understand the three primary adjustments every coilover offers: ride height, damping, and spring rate. Each interacts with the others, so changes should be made in a logical sequence.

Ride Height and Corner Balance

Lowering the car reduces the center of gravity, which decreases body roll and improves lateral grip. However, too much drop can bottom out the suspension, bind sway bars, or alter suspension geometry. A good starting point is to lower the car about one inch from stock and then corner-weight it so each tire carries the correct load. Ohlins recommends measuring ride height with the driver seated and fuel half full. Use a quality digital level to ensure both sides match within 1/16 of an inch.

Damping (Rebound and Compression)

Damping controls how fast the suspension compresses and extends. Rebound damping manages the spring’s return after a bump; too much rebound causes the suspension to pack down, too little makes the car feel bouncy. Compression damping controls how the suspension absorbs impacts. Most coilovers offer adjustable rebound and sometimes separate low- and high-speed compression. A typical baseline is to set damping to the middle of the range and adjust one click at a time based on feel. This guide from Car Bibles walks through the process in detail.

Spring Rate Selection

Spring rate determines how much force is needed to compress the spring. Heavier springs reduce body roll and allow lower ride heights but can make the ride harsh. Lighter springs improve comfort but require more damping control. A common rule of thumb: street cars use springs in the 4-6 kg/mm range; track cars often go 8 kg/mm or higher. Never run a spring so stiff that the damper can’t control it — the suspension will skip over bumps and lose traction.

Ohlins: Precision Engineering for the Enthusiast

Ohlins is synonymous with motorsport technology. Their road-going coilovers, like the Road & Track (R&T) series, use a patented Dual Flow Valve (DFV) system that provides consistent damping regardless of temperature or driving conditions. This makes them ideal for drivers who want a car that is comfortable on the street yet capable on track without constant re-adjustment.

Setting Ride Height on Ohlins

Ohlins coilovers use a threaded spring seat and an adjustable lower mount. To change ride height, you should adjust the spring perch rather than the lower mount, because moving the lower mount changes the damper stroke. Start by measuring the factory ride height at each corner. Then, using the spanner wrenches provided, reduce the height by 10 mm at a time. After each change, roll the car a few feet to settle the suspension and re-measure. Always torque the lock rings to the manufacturer’s specification (typically 40-50 lb-ft for Ohlins) to prevent them from loosening under vibration.

Damping Adjustment Sequence

Ohlins dampers have 20 clicks of rebound adjustment (some models also have compression). Begin with the recommended setting from the manual — usually 12-14 clicks from full stiff for street use. Drive a familiar route and note any floatiness, excessive roll, or harshness.

  • If the car feels floaty or nose-dives under braking: Add rebound damping by turning the knob clockwise (stiffer). Try 2-3 clicks.
  • If the car feels skittish over bumps or wallows: Reduce rebound damping (counterclockwise). Try 2-3 clicks.
  • On track: Increase both rebound and compression (if adjustable) to control body roll under high lateral G. Just don’t go more than 5-6 clicks from the baseline, or you risk overwhelming the tire.

Ohlins recommend re-valving the dampers if you change spring rates by more than 20% from the factory spec, as the DFV system is tuned to a specific range.

Maintenance Tips for Ohlins

Ohlins coilovers are serviceable. Rebuild intervals depend on usage — street cars can go 30,000-50,000 miles, while track cars need inspection every 10,000 miles. Check for oil leaks around the shaft seal and listen for clunking noises that indicate worn bushings. Use only Ohlins-specific damping oil to maintain the DFV characteristics.

Tein: Versatile and Budget-Friendly Performance

Tein offers a wide range of coilovers, from the entry-level Street Basis Z to the fully adjustable Flex A and Mono Sport. Their strength lies in accessibility: most models include 16-level damping adjustment and dedicated height adjustability without affecting spring preload. This makes Tein a favorite for drivers who want to explore tuning without spending a fortune.

Height Adjustments on Tein Coilovers

Tein uses a two-piece lower mount design. The threaded lower mount lets you change ride height without altering the spring perch, which keeps spring preload constant. To lower the car, loosen the lower lock ring and turn the mount upward. After adjustment, ensure the lock ring is tightened to 45-55 lb-ft. A common mistake is to lower the rear too much, causing the driveshaft to angle steeply, leading to vibration. Keep rear drop within 1.5 inches of stock unless you have adjustable camber arms.

Damping Adjustment and Fine-Tuning

Tein’s damping knobs are located at the top of the damper shaft for front units (accessible through the strut tower) and on the bottom of the rear units. The 16-level range is usually labeled 1 (softest) to 16 (stiffest). Unlike some brands, Tein recommends starting at a softer setting and working upward.

  • Street baseline: Set all four corners to 8 clicks from soft. Drive and assess.
  • Understeer (front pushes wide): Soften the rear damping by 2-3 clicks, or stiffen the front by 2 clicks.
  • Oversteer (rear slides): Soften the front damping by 2 clicks, or stiffen the rear.
  • Harshness on bumpy roads: Soften all four by 4 clicks, then adjust front and rear independently.

Because Tein coilovers use a simple needle-valve design, they are more sensitive to temperature changes. In cold weather, the oil thickens, so you may need to soften the damping by 2-3 clicks to maintain the same feel.

Spring Rates and Preload

Tein offers optional spring rate kits. For a daily-driven car, stick with the standard rates (typically 4-5 kg/mm front, 3-4 kg/mm rear). For track use, you can go as high as 8-10 kg/mm. If you change springs, you must readjust preload. Preload is the amount the spring is compressed when the damper is fully extended. Too much preload reduces droop travel and can make the suspension top out over bumps. Aim for 5-10 mm of preload on the front, 2-5 mm on the rear.

Tein’s EDFC (Electronic Damping Force Controller) system allows on-the-fly adjustment from inside the cabin. If you have it, use the auto mode for daily driving and stiffer manual settings for spirited runs. Learn more about EDFC on Tein’s website.

Eibach: Comfort and Control with Proven Springs

Eibach has built its reputation on high-quality springs, and their coilover systems — such as the Pro-Street S and Multi-Pro — reflect that expertise. Eibach coilovers prioritize ride quality while offering ample adjustability. They are an excellent choice for drivers who want improved handling without a punishing ride.

Height Adjustment for Eibach Systems

Eibach uses a threaded sleeve and lower spring plate system (similar to a sleeve-over design on the Pro-Street S) or a true threaded body on the Multi-Pro. For the sleeve-over models, height adjustment is done by moving the lower spring collar. Be careful not to unthread the collar so far that the spring becomes loose at full droop; the spring should remain captively seated. For the Multi-Pro, adjust the lower mount after setting the spring perch per the manual. Eibach recommends setting the front 0.25 inch lower than the rear to prevent a rake that causes understeer.

Damping and Spring Rate Optimization

Eibach’s dampers are pre-valved to match the included springs. This means you shouldn’t need to re-valve for street use. The damping adjustment range is typically 24 clicks. Start at 12 clicks from stiff (medium) and do a slalom test.

  • If the car rolls too much: Add 2-4 clicks of rebound damping front and rear.
  • If the car dives under braking or lifts the inside rear wheel: Stiffen the front compression (if separately adjustable) by 2-4 clicks.
  • If the car skips over mid-corner bumps: Reduce rebound 2 clicks front and rear — the shocks are over-controlling the springs.

Eibach’s progressive spring rates on some models (e.g., Pro-Kit coils) mean the spring softens over small bumps and stiffens during compression. With these, you need less damping than with linear-rate springs. Over-damping will make the ride harsh.

Alignment and Toe After Adjustment

Whenever you change ride height, the camber, caster, and toe angles change. Lowering typically increases negative camber in the front, which improves cornering but can cause inner tire wear on the highway. After setting the final ride height, get a professional alignment. Eibach recommends setting front camber to -1.5 to -2.0 degrees for street and -2.5 to -3.0 for track, and toe to zero or slight toe-out for turn-in response. Check the Eibach installation guides for specific alignment specs for your model.

Common Coilover Adjustment Mistakes and How to Avoid Them

Even with the best hardware, improper adjustments can ruin the experience. Here are pitfalls specific to these brands:

  • Confusing height and preload: On Ohlins and Tein, never use the lower mount to raise the car without first adjusting the spring perch — it changes the damper stroke.
  • Ignoring cross-weight: If one rear corner is heavier than the other, the car will pull under acceleration. Corner-weight scales are the only way to fix this.
  • Over-tightening damping knobs: Many Tein and Eibach knobs are plastic and can strip if forced past the click stop.
  • Not re-checking bolts: After 500 miles, retorque all suspension bolts, especially the top hat nuts and lower clevis bolts.
  • Mixing spring rates front-to-rear drastically: Changing rear spring rate by more than 20% from front without re-valving can induce unpredictable oversteer or understeer.

Step-by-Step Adjustment Sequence for Any Brand

  1. Set ride height using the manufacturer’s method. Lower incrementally (5-10 mm at a time). Drive to settle and re-measure.
  2. Corner-weight the car (ideal, not required for street-only use).
  3. Set baseline damping to the middle of the range or the manual’s recommendation.
  4. Test drive on a smooth road, a bumpy road, and a tight corner. Note understeer/oversteer, floatiness, and harshness.
  5. Adjust damping one axis at a time (front or rear) by 2-3 clicks. Test again.
  6. Repeat until the car feels planted and responsive. Write down final settings.
  7. Get an alignment after all height adjustments are final.

Conclusion: Dialing In Your Setup

Ohlins, Tein, and Eibach each bring a unique philosophy to coilover design. Ohlins rewards precision and consistency for the dedicated enthusiast. Tein offers accessible adjustability that encourages experimentation. Eibach focuses on ride quality and spring expertise, making it ideal for drivers who want performance without sacrificing daily comfort. By methodically working through ride height, damping, and spring rate — and avoiding common pitfalls — you can transform your car’s handling and unlock the full potential of these exceptional coilover systems. Always refer to the manufacturer’s documentation for specific torque specs and recommended settings, and don’t be afraid to make small, recorded changes. Your car will tell you what it needs.