The Ultimate Guide to Subaru Rally Suspension Parts

Building a Subaru for rallying means choosing suspension parts that can handle rough terrain, high-speed cornering, and repeated impacts. Unlike street setups, rally suspension prioritizes compliance, durability, and predictable handling over comfort. Whether you're prepping a WRX, STI, or older Impreza for stage rally or rallycross, the right components make all the difference. This guide covers essential parts, material choices, and what to look for from leading manufacturers.

Understanding Rally Suspension Needs

Rally suspension must absorb large bumps and maintain tire contact over uneven surfaces. Typical gravel roads require long-travel springs, high-quality dampers, and reinforced mounts. Key differences from road suspension:

• Increased travel: More wheel movement to avoid bottoming out.
• Firm yet compliant valving: Dampers must react quickly to small bumps without packing down.
• Stronger hardware: Heavy-duty ball joints, control arms, and bushings to resist mud and debris.

Key Components of a Rally Suspension Upgrade

Coilovers for Rally

Coilovers are the backbone of any rally suspension. Look for remote-reservoir designs that separate oil from gas to prevent fade under heavy use. Brands like Reiger, Proflex, and Ohlins offer rally-specific models with external adjusters for rebound and compression. Gravel-spec coilovers often have softer springs (e.g., 8-10 kg/mm front, 6-8 kg/mm rear) and longer stroke than track setups. Entry-level options include BC Racing or Feal with rally spring rates, but expect to compromise on heat management.

Springs and Spring Rates

Rally springs are usually linear rate for predictable compression. For gravel, softer rates help grip on loose surfaces – typical rates range from 400-600 lb/in front and 300-500 lb/in rear for a WRX. Tarmac rally uses stiffer springs (600-800 lb/in front). Consider helper springs to prevent coil bind at full droop.

Sway Bars for Body Control

Thicker sway bars reduce body roll during transitions. On gravel, a softer or disconnecting front bar can improve front grip, while a stiffer rear bar rotates the car. Adjustable aftermarket bars (e.g., Whiteline, Hotchkis) allow fine-tuning. Remove the rear sway bar entirely on loose surfaces for better traction.

Bushings and Mounts

Polyurethane or spherical bearings replace rubber bushings to reduce slop. Rally cars often use solid aluminum mounts for control arms and subframes to handle abuse. Avoid harsh materials on street-driven cars; polyurethane is a good compromise.

Control Arms and Links

Reinforced control arms with replaceable ball joints are critical. Aftermarket arms like those from Superpro or Cusco offer strengthened pivot points. Adjustable arms allow camber and caster tuning for different surfaces.

Strut Braces and Chassis Stiffening

A front strut brace helps maintain alignment under load. For rally, a bolt-in brace with triangulation to the firewall is effective. Rear shock tower braces and underbody bracing reduce flex.

Top Brands for Subaru Rally Suspension Parts

Several manufacturers specialize in Subaru rally components. Here's a breakdown:

Reiger Racing

Dutch brand known for high-end rally dampers. Their Evo line includes separate high- and low-speed compression adjustment, piggyback or remote reservoirs, and long-life seals. Expect to spend $3,000+ per set. Ideal for serious competitors.

Proflex

Offers custom-valved coilovers for Subaru models. Proflex units are rebuildable and often used in ARA (American Rally Association). Prices around $2,500–$4,000 for a full set.

Ohlins

Swedish manufacturer with rally heritage. Their Road & Track line is popular for dual-use cars. For dedicated rally, the TTX series provides race-level damping. High cost ($4,000+) but proven durability.

BC Racing

Budget-friendly option with DR (Dual Reservoir) series offering external adjusters. Suitable for entry-level rallycross or budget stage rally. Spring rates can be customized. Expect to pay $1,200–$1,800.

Whiteline

Focus on sway bars, bushings, and alignment components. Not a full suspension maker, but their parts are essential for dialing in handling. Reasonable prices and good support.

Suspension Setup for Different Rally Surfaces

Gravel / Dirt

• Softer springs and low compression damping for traction.
• Raise ride height (2-3 inches over stock) for clearance.
• Reduce front sway bar stiffness or disconnect.
• Use more rebound damping to control rebound after bumps.

Tarmac / Asphalt

• Stiffer springs and high compression damping.
• Lower ride height (1-1.5 inches drop).
• Maintain or increase sway bar stiffness.
• Less rebound than gravel to maintain contact.

Snow / Ice

• Similar to gravel but with softer damping.
• Use tall, narrow tires – suspension settings become secondary.

Installation and Setup Tips

Proper installation is as important as the parts themselves. Here are practical steps:

1. Corner weigh the car after install to adjust spring preload and ride height evenly.
2. Set alignment with rally specs: more negative camber (-2.5 to -3.5° front) for cornering, slight toe-out for turn-in. For gravel, less camber is better.
3. Check bump steer – use adjustable tie rod ends (like those from Whiteline) to correct.
4. Lubricate and protect – use anti-seize on threads and treat exposed metal with rust inhibitor.
5. Test and adjust – start with manufacturer recommended settings and fine-tune based on driving feel.

Final Recommendation

For a serious stage rally build, invest in true rally-specific coilovers from Reiger or Proflex – they will last and perform. Pair them with Whiteline sway bars and upgraded bushings. For rallycross or limited events, BC Racing DR coilovers with custom spring rates offer good value. Always allocate budget for proper alignment and corner balancing. Avoid mixing brands without research; ensure components work together. The right suspension transforms your Subaru into a capable rally machine – take the time to choose based on your surface and competition level.