Complete Guide to S14 Suspension Parts: Upgrades and Replacements

Upgrading or replacing the suspension on your Nissan 240SX (S14) is one of the most effective ways to improve handling, ride quality, and overall driving experience. Whether you’re building a drift car, a track toy, or just refreshing a daily driver, understanding the right S14 suspension parts is essential. This guide covers key components, what to look for, and how to make smart choices without overspending.

Why Upgrade S14 Suspension?

The S14 chassis is known for its balanced front-engine, rear-wheel-drive layout. But factory suspension components are now over two decades old. Bushings wear out, shocks lose damping, and springs sag. Upgrading not only restores performance but can transform the car’s behavior. Common goals include:

• Reducing body roll
• Improving steering response
• Lowering ride height for aesthetics and center of gravity
• Increasing adjustability for different driving conditions

Key S14 Suspension Parts

Coilovers

Coilovers are the single most popular upgrade. They replace the entire strut assembly with a threaded shock body and adjustable spring perch. Benefits:

• Ride height adjustment – Lower or raise each corner independently.
• Damping adjustment – Many allow separate compression and rebound tuning.
• Performance – Better damping curves than most lowering springs and shocks.

What to consider:

• Budget – Entry-level (e.g., BC Racing, Tein) vs. mid-range (e.g., KW, Ohlins) vs. high-end (MCS, JRZ). Inexpensive coilovers often have harsh ride quality.
• Spring rates – Stiffer springs reduce body roll but can be jarring on the street. A common street setup is 8k front / 6k rear.
• Durability – Look for stainless steel bodies, sealed cartridges, and corrosion-resistant hardware if you drive in salt or wet conditions.

Lowering Springs & Shocks

If you want a budget-friendly drop, pairing lowering springs with quality shocks (like Koni Yellows) works well. Springs lower the car 1-2 inches, while shocks provide proper damping. Keep in mind:

• You won’t get ride height adjustment.
• Spring rates are fixed to the set.
• Shocks must match the spring’s stroke and rate.

Popular spring brands: Eibach, Swift, Tanabe. Shock options: Koni Sport, Tokico (if available).

Control Arms

S14 front and rear control arms often need replacement due to worn ball joints or bent arms. Upgraded arms offer adjustability for camber, caster, and toe.

Front:

• Upper control arms (UCA) – Usually fixed on S14, but adjustable versions allow camber adjustment for lowered cars.
• Lower control arms (LCA) – Often replaced with spherical bearing or polyurethane bushings for better alignment and feedback.

Rear:

• Rear upper control arms (RUCA) – Essential for correcting camber after lowering.
• Rear lower control arms (RLCA) – Also adjustable for toe and camber.
• Traction rods and toe rods – Help locate the rear axle and reduce compliance.

Material: High-strength steel or aluminum. Aluminum is lighter but can be more prone to bending in rough use.

Sway Bars (Anti-Roll Bars)

Thicker sway bars reduce body roll without changing spring rates much. S14 stock bars are hollow and thin. Upgrading to solid or thicker hollow bars (e.g., Whiteline, Cusco, Hotchkis) makes a noticeable difference.

• Front bar – 28-32mm diameter typical.
• Rear bar – 22-26mm diameter typical.
• Adjustable end links allow fine-tuning of roll stiffness.

Bushings

Stock rubber bushings degrade, causing sloppy handling. Upgrading to polyurethane (poly) or spherical bearings (solid type) tightens everything up.

• Polyurethane – Good for street/track compromise. More NVH (noise/vibration/harshness) but not as harsh as solid.
• Spherical bearings – Zero compliance, maximum feedback, but noisy and require maintenance.

Common places to replace: subframe bushings, differential bushings, control arm bushings, sway bar end links.

Steering Components

• Tie rods – Inner and outer tie rods wear over time. Upgraded ones with stronger joints or adjustable length can improve turn-in.
• Rack & pinion bushings – Harder bushings reduce steering slop.

Brake Upgrades (Related)

While not strictly suspension, better brakes allow you to exploit upgraded suspension. Consider:

• Larger rotors (e.g., Z32 brake upgrade)
• Performance pads and braided lines
• Brake master cylinder brace

How to Choose S14 Suspension Parts

Determine Your Use Case

• Daily driver / street – Focus on comfort and reliability. A mild coilover (e.g., Tein Flex Z or BC Racing BR) with 8/6 spring rates, adjustable sway bars, and polyurethane bushings.
• Drift – Stiffer springs (10k+ front / 8k+ rear), adjustable control arms for aggressive alignment, solid bushings, and maybe a hydro e-brake.
• Track / autocross – Balance of stiffness and adjustability. Coilovers with damping adjustment, camber plates, and spherical bearings in key locations.
• Budget build – Lowering springs + Koni shocks, used coilovers (if in good condition), and upgrading bushings one by one.

Compatibility Notes

• S14 suspension parts are generally interchangeable between Zenki (1995-1996) and Kouki (1997-1998), but some aftermarket parts may differ for early vs. late models. Always check fitment.
• Many S13 (1989-1994) suspension parts also fit S14, but not all. Control arms and springs have different dimensions; double-check.
• If you have ABS, ensure coilovers don’t interfere with the ABS sensor wiring.

Installation and Alignment

• A proper alignment after any suspension work is non-negotiable. Adjustable parts allow you to set camber, caster, and toe to your needs.
• Many bolt-on parts can be installed at home with basic tools (jack, stands, wrenches). However, pressing bushings or replacing strut mounts may require special tools.
• If you lower the car more than 1.5 inches, you may need a roll center adjustment kit or bump steer correction.

Practical Recommendations

For most S14 owners, a balanced street setup starts with:

1. Coilovers – $1,000-$2,000 range: BC Racing BR (good value) or KW V1 (slightly better ride).
2. Adjustable rear upper control arms – Allows camber correction (approx $200-$300.
3. Front and rear sway bars – Whiteline or Eibach: typically $300-$500 total.
4. Polyurethane bushing kit – Energy Suspension or Whiteline: $150-$250.
5. Alignment – Set to modest negative camber (-1.5 to -2 degrees front, -1 to -1.5 rear) and zero toe.

If on a tighter budget, start with quality shocks and lowering springs, then add sway bars and bushings as you can.

Avoid cheap no-name coilovers; they often have poor damping, no ride height adjustment that holds, and may fail prematurely. Stick with reputable brands that have customer support and replacement parts available.

Final Thoughts

S14 suspension parts offer a wide range of possibilities to tailor your 240SX’s handling. Focus on your driving goals and budget. A smart, incremental approach—starting with coilovers and alignment—will give you the most noticeable improvement. Don’t neglect worn rubber bushings; they are the weak link in an old chassis. With the right parts and careful installation, your S14 can handle like a modern sports car while retaining its classic character.