1993 Mazda RX-7 Suspension Parts: The Complete Guide to Upgrading Your FD3S

The 1993 Mazda RX-7 (FD3S) is celebrated for its lightweight, twin-turbo rotary engine and near-perfect 50/50 weight distribution. But to really unlock its potential, suspension upgrades are key. The factory setup was good for its time, but after 30 years, bushings are shot, shocks are worn, and handling can feel vague. Whether you're restoring a stock example or building a track weapon, understanding the right suspension parts is crucial. This guide covers everything from coilovers to bushings, helping you make informed choices for your FD.

Understanding the FD3S Suspension System

The 1993 RX-7 uses a double-wishbone suspension at all four corners – a rarity on a production car. This design offers excellent camber control and grip, but it also means more components that can wear out. Common weak points include the rubber bushings, which deteriorate with age, and the OEM shocks, which tend to be underdamped for aggressive driving. Many owners also notice excessive body roll in corners. The suspension is tuneable, but only if you replace the right parts.

Key Suspension Components for the 1993 RX-7

Coilover Kits

Coilovers are the most popular upgrade for the FD. They replace the shock and spring with an adjustable unit, often allowing ride height, damping, and sometimes camber adjustment. Brands like Ohlins, KW, Tein, HKS, and BC Racing offer kits tailored to the RX-7. For street use, a coilover with 12-30 clicks of damping adjustment (like BC Racing BR or Tein Flex Z) provides a balance of comfort and performance. For track duty, Ohlins Road & Track or KW Clubsport give better heat management and finer control. Spring rates should match your use: 7-8 kg/mm front and 5-6 kg/mm rear for street, up to 12/10 for track.

Shock Absorbers and Struts

If you want to keep the stock spring perches, upgraded shocks are an option. Koni Yellow Sport shocks are adjustable and rebuildable, offering a significant improvement over worn factory units. Bilstein and Monroe also produce direct-fit replacements. For a budget build, a set of KYB AGX shocks provides multiple damping settings. Note that replacing shocks alone won't fix worn bushings or springs, but it's a good starting point.

Sway Bars

Sway bars reduce body roll without sacrificing ride quality. Racing Beat is the go-to brand for the FD, offering front and rear bars in adjustable diameters. A common setup is a 26mm front and 22mm rear bar. Cusco and Eibach also make sway bars. Consider adjustable end links (from Racing Beat or SuperNow) to prevent binding at lowered ride heights.

Control Arms and Bushings

Factory rubber bushings are the main culprit for sloppy handling. Upgrading to polyurethane bushings (SuperPro, Whiteline, Powerflex) restores precision without adding excessive harshness. For track cars, spherical bearings in the lower control arms and trailing arms give zero deflection but transmit more noise. Complete control arm kits from Racing Beat and Autoexe include pre-installed bushings and ball joints, saving labor.

Springs

Lowering springs are a cheaper alternative to coilovers. Eibach Pro-Kit drops the car about 1.2 inches and improves cornering. H&R and Swift also make springs for the FD. Spring rates should match your shocks – pairing progressive-rate springs with adjustable shocks works well. However, on older cars with high mileage, worn shocks will quickly degrade the ride even with new springs.

Tie Rods and Ball Joints

Worn tie rods and ball joints cause vague steering. Replace with OEM-quality units from Moog or TRW. For alignment adjustability, adjustable tie rod ends (from Megan Racing or Voodoo13) allow fine-tuning of toe settings, especially after lowering. Ball joints are a press-fit service item; replace them when you replace control arms.

Sway Bar Links and Bushings

The factory plastic sway bar links are prone to breaking. Upgrade to heim-joint (spherical) links from Racing Beat or AWR for durability. New polyurethane sway bar bushings reduce slop and improve response.

Strut Tower Braces

A front strut tower brace stiffens the chassis, improving turn-in and feedback. Cusco and Autoexe make bolt-on braces that clear the intake manifold. A rear brace helps, but the gain is smaller. Combined with underbody braces (like the Beatrush front under brace), the chassis feels more rigid.

Performance Goals: Street vs. Track

For a daily-driven street car, focus on a quality coilover set with moderate spring rates, polyurethane bushings, and a front sway bar. This combination transforms the car without compromising comfort. For autocross or light track duty, add a rear sway bar, adjustable toe links, and a front strut brace. For serious track use, go with spherical bearings throughout, a high-end coilover with external reservoirs, and custom alignment settings.

Installation Considerations

Suspension work on the FD is doable at home with basic tools, but a professional alignment is mandatory after any ride height or link change. Note that adjusting camber on the rear requires removal of the trailing arm bolt – a common struggle. Also, old bolts on a 30-year-old car may be seized; plan on cutting some out. Pair suspension upgrades with fresh tires and a proper alignment for the best results. A street alignment typically calls for -1.0 to -1.5 degrees camber front and rear, with zero toe. Track alignments use more camber ( -2.0 to -3.0 ) and slight toe-out in front.

Budgeting Your Suspension Build

You can spend anywhere from $500 (replacing bushings and shocks) to over $5000 (full Ohlins coilovers plus spherical bearings). A balanced street upgrade – coilovers ($1500), sway bars ($400), poly bushings ($300), plus labor – runs about $2500. Don't skimp on the bushings; they make the biggest difference per dollar. Start with new control arm bushings and sway bar links, then add coilovers.

Final Recommendation

For most 1993 RX-7 owners, a practical solution is the BC Racing BR coilover kit with 10 kg front and 8 kg rear springs, a set of Racing Beat 26mm front and 22mm rear sway bars, and SuperPro polyurethane bushings in the front control arms and rear trailing arms. This setup significantly improves grip and response while remaining streetable. If the budget allows, upgrade to the Ohlins R&T for better damping control. Always replace all worn ball joints and tie rods at the same time – they are cheap insurance. With these upgrades, your FD will handle as sharply as its looks suggest.