How To Raise Coilovers Height: Complete Step-by-Step Adjustment Guide

Raising your coilover suspension height requires precise measurement of the spring perch collars, proper vehicle weight offloading via a hydraulic jack, and careful use of spanner wrenches to avoid damaging the threaded damper bodies. By following correct pre-load preservation techniques and ensuring proper corner-balancing procedures, you can achieve your target ride height without negatively impacting suspension geometry or ride quality.

Pre-Operation & Planning Checklist

Adjusting threaded-body suspension systems involves altering the ride height independently of spring preload on twin-tube or monotube dampers. Success in this procedure depends heavily on having the correct instrumentation, cleanliness around the threaded shock body, and understanding the mechanical interaction between the locking collar and the spring seat.

• Essential Gear & Tools: Hydraulic floor jack (minimum 2-ton capacity), heavy-duty jack stands (pair or set of four), chassis-specific spanner wrenches (typically supplied with the coilover kit), a metric socket and wrench set, a copper or brass drift punch, a soft-bristle wire brush, aerosol brake cleaner or penetrating fluid (such as PB Blaster or WD-40 Specialist), and a digital caliper or precision tape measure.
• Prerequisite Knowledge & Standards: Familiarity with wheel torquing specifications (typically 80-110 lb-ft depending on the vehicle platform), understanding of the difference between full-body height adjustment and spring perch adjustment, and the necessity of a post-adjustment professional four-wheel alignment.
• Project Scope & Benchmarks: Estimated duration of 2 to 4 hours depending on fastener corrosion levels; estimated budget of zero (if tools are on hand) to $150 if replacement spanner wrenches or professional corner-balancing alignment is factored in.

Step-by-Step Coilover Height Adjustment Procedure

Step 1: Secure and Elevate the Vehicle

Park the vehicle on a completely flat, level concrete surface, engage the emergency brake firmly, and block the wheels that will remain on the ground. Loosen the lug nuts on all wheels slated for adjustment before lifting the chassis. Position your hydraulic floor jack under the manufacturer-approved factory pinch weld or subframe jacking points, elevate the vehicle securely, and lower it down onto heavy-duty jack stands rated for the vehicle's weight. Never rely on a hydraulic jack alone when working under or around suspension components.

Warning: Ensure the chassis is completely stable on jack stands before placing any torque or physical weight against the suspension components during collar rotation.

Step 2: Remove the Wheels and Clean the Shock Bodies

Remove the lug nuts entirely and take off the wheels to gain unobstructed visual and physical access to the coilover assemblies. Environmental exposure to road salt, brake dust, and mud frequently causes debris to pack tightly into the fine threads of aluminum or steel coilover bodies. Spray the threaded section around the locking collar and spring perch liberally with a penetrating fluid, and vigorously scrub the threads using your wire brush.

Pro-Tip: If stubborn grit remains in the threads, use compressed air to blow out the grooves before attempting to turn any collars to prevent galling the metal threads.

Step 3: Measure the Current Ride Height and Thread Exposure

Before making any mechanical adjustments, establish a reliable baseline. Measure vertically from the center of the wheel hub to the bottom edge of the fender lip on all four corners, noting these figures down. Additionally, measure the exposed threaded body length from the top of the lower locking collar to a fixed point on the damper bracket using your digital caliper. This ensures you maintain accurate tracking of how many millimeters or inches you are raising the vehicle.

Step 4: Loosen the Locking Collar

Every threaded coilover features at least one locking collar situated directly beneath the spring perch (for systems that adjust height via spring pre-load) or at the base of the lower bracket (for true dual-adjustable coilovers). Insert the matching hook spanner wrench securely into the notches of the locking collar. Hold the lower spring perch or bracket stationary, and strike the tail of the spanner wrench handle firmly with the palm of your hand or a dead-blow mallet in a counter-clockwise direction (viewed from above) to break the tension ring loose. Spin the locking collar downward by at least 10 to 15 millimeters to create clearance for the spring perch.

Step 5: Adjust the Spring Perch or Lower Mount to Raise the Vehicle

To raise the ride height on a standard coilover system, you must rotate the spring perch upward (clockwise when viewed from above). As the spring perch moves up, it compresses the spring slightly and forces the threaded body downward relative to the wheel assembly, effectively lifting the chassis. If your coilovers utilize independent lower bracket height adjustment, loosen the lower pinch bolt on the knuckle and rotate the entire damper body clockwise out of the lower mount. Use your caliper to measure exact, uniform adjustments on both left and right sides of the axle.

Step 6: Lock Down the Collars and Reassemble

Once the target ride height measurement is reached, spin the locking collar back up until it makes fierce, metal-on-metal contact with the spring perch or lower mount. Engage both spanner wrenches in an interlocking opposition technique—holding the spring perch stationary while tightening the locking collar counter to it with maximum hand force. Spray down the cleaned threads with a light corrosion-inhibiting spray. Reinstall the wheels, lower the vehicle off the jack stands, torque the lug nuts in a star pattern to factory specifications, and bounce the suspension several times to settle the bushings before taking final measurements.

Coilover Adjustment Specifications Comparison

Common Site Failures & Field Fixes

• Stuck or Seized Locking Collars:
  
  
  • Root Cause: Galvanic corrosion between aluminum collars and steel threaded bodies, compounded by baked-on brake dust and road salt.
  • Actionable Fix: Soak the threads overnight with a high-grade penetrating catalyst. Wrap a heat gun or propane torch around the collar (avoiding direct prolonged flame contact on dampeners) to expand the outer metal ring before striking the spanner wrench with sharp, deliberate impacts.
• Spring Binding and Creaking Noises During Turns:
  
  
  • Root Cause: Twisting friction of the coil spring against the aluminum perch as the steering knuckle rotates the strut assembly.
  • Actionable Fix: Install dedicated thrust sheets or needle-bearing preload washers between the spring and the perch to allow smooth rotational compliance.
• Unintended Suspension Stiffening After Raising:
  
  
  • Root Cause: Adjusting ride height by excessively winding up the spring perch instead of lowering the threaded body into the lower mount, which over-compresses the spring rate.
  • Actionable Fix: Back off the spring perch to restore standard static preload (zero play at full droop) and shift the height adjustment to the lower bracket assembly.

Frequently Asked Questions

How many turns on a coilover equals one inch of height?

There is no universal conversion factor because thread pitch varies widely across different coilover brands (e.g., KW, BC Racing, Tein, Ohlins). Generally, a 1.5mm to 2.0mm linear movement on the threaded body translates to roughly a 1mm change in wheel height due to suspension leverage ratios. Always measure physical changes on the fender rather than relying strictly on thread counts.

Do I need an alignment after raising my coilovers?

Yes, absolutely. Changing your vehicle's ride height directly alters static suspension geometry parameters, specifically toe angle and camber. Failing to perform a professional four-wheel alignment after height adjustments will result in rapid, uneven tire wear and unpredictable vehicle handling dynamics.

Can I adjust coilover height while the wheels are on the ground?

No. The immense vertical load of the vehicle's weight pressing down through the spring makes it mechanically impossible to turn the locking collars without risking severe damage to the spanner wrench teeth and the threaded body. The chassis must always be safely supported on jack stands with the suspension hanging at full droop.

Why is one side of my car sitting lower than the other?

Chassis weight distribution is inherently asymmetrical due to the placement of the driver, fuel tank, and steering components. Coilovers are typically adjusted with driver-seat ballasting or professional corner-balancing scales to ensure cross-weight percentages are equalized across all four contact patches.

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