Best RX-7 FD Coilovers: HKS Hipermax vs Tein (93-95)

The FD-generation Mazda RX-7 (FD3S) is one of the best-handling chassis Japan ever built — a 2,800 lb sports car riding on double-wishbone suspension at all four corners and a 255 hp 13B-REW sequential twin-turbo rotary. But most of the FDs rolling into our Tampa, FL shop are running 30-year-old dampers that have long since given up. A set of quality RX-7 FD coilovers is the single biggest handling upgrade you can make, and this guide compares the three we sell most: the track-bred HKS Hipermax R, the street-focused HKS Hipermax S, and the budget-friendly Tein Flex Z.

Why Upgrade the Suspension on a 1993–1995 RX-7 FD?

Coilovers are the highest-value handling upgrade for the FD3S because they replace worn OEM struts, lower the center of gravity, and let you dial in damping and corner weights on a chassis that was already engineering brilliance from the factory. The FD RX-7 weighs roughly 2,778–2,800 lbs and puts down 255 hp through a 1.3L 13B-REW twin-turbo rotary, so the car is light and eager to rotate — but three decades of heat cycling leave the original dampers blown and the ride floaty.

A coilover kit bundles adjustable ride height, adjustable damping, and fresh springs into one bolt-in package. On the FD's double-wishbone layout, a good set restores flat body control, sharpens turn-in, and lets you set a stance without sacrificing bump compliance. One critical caveat we tell every customer: running an incorrect alignment on a lowered FD3S will destroy tire wear and actually degrade handling compared to stock. Budget for a corner-balanced alignment and camber-correction hardware alongside the kit — it is not optional on this car. Browse our full range in the coilovers collection and suspension parts.

A full coilover kit for the FD3S includes four assembled dampers with height-adjustable perches, matched springs, and upper mounts, so it bolts in using the factory mounting points — no welding or fabrication required. Plan on a weekend in the garage or a few hours at a shop, plus that all-important alignment afterward. Because the FD uses a double-wishbone setup front and rear, ride-height changes shift camber and roll center, which is exactly why the adjustability of a coilover pays off over a simple lowering-spring kit: you can drop the car for looks and still dial the damping back to something livable.

RX-7 FD Coilovers Compared: HKS vs Tein

Here is how the three FD3S coilover kits stack up on the specs that actually change how the car drives — damping adjustment, damper design, intended use, and price. Prices at NLP Performance currently run from around $924 to $2,680.

HKS Hipermax R: The Track-Focused Top Pick

The HKS Hipermax R is our top pick for a 1993–1998 FD3S that sees real track time. It uses an inverted monotube damper for constant performance under load, pillowball (spherical bearing) upper mounts that let you run camber for street and circuit without swapping parts, and HKS's exclusive Super Response Fluid (SRF) high-temperature damper oil to resist fade during long sessions. Damping is set with 30-level, 1-way adjustment via HKS's WR Needle valve.

HKS Hipermax S: Best Street Coilover for the FD3S

The HKS Hipermax S is the street-and-canyon version of the same platform, and it is our pick for a lowered FD that still sees daily miles. It shares the 30-level WR Needle damping adjustment and a large-diameter monotube damper, but adds HKS's Dual PVS (Preload Valve System), which suppresses unnecessary damping force at higher piston speeds for a more compliant ride over broken pavement. Fitment covers 1992–1998 FD3S, and at $2,250 it undercuts the R by $430.

Tein Flex Z: Best Budget Coilover for a Daily FD

At $924, the Tein Flex Z is the value play — and it is a genuinely good coilover, not a cheap-out. It pairs a twin-tube damper with 16-level linear damping adjustment (Tein's ADVANCE NEEDLE technology) for a supple ride at low speeds and planted control when you push. Full-length adjustment lets you set ride height and spring preload independently, so you can go low without slamming the springs into coil bind. It is also EDFC-compatible, meaning you can add Tein's electronic damping controller later to unlock 32- or 64-level adjustment from the driver's seat.

Sway Bars and Chassis Bracing to Pair With Your Coilovers

Coilovers control ride height and damping, but they do not tune the FD's balance the way an adjustable sway bar does. Adding sway bars and a strut brace is the cheapest way to sharpen the RX-7's already-neutral handling and reduce body roll. Two we recommend alongside any of the coilovers above:

How to Choose: Track, Street, or Budget?

Choosing between these three FD3S coilovers comes down to how you use the car. Pick the HKS Hipermax R if you run track days and want the most consistent damper and adjustable camber — the inverted monotube and SRF fluid are built for heat. Pick the HKS Hipermax S if your RX-7 is a lowered street car that occasionally sees a canyon or autocross; the Dual PVS ride quality is the sweet spot for the money. Pick the Tein Flex Z if you want a quality daily coilover at $924 with room to grow via EDFC. Whatever you choose, factor in an alignment and camber correction — on the FD, geometry is everything. Our Tampa, FL team can help you match a kit to your goals; browse the full coilover collection to compare fitments.

Remember that the FD does all of this on a featherweight chassis. At roughly 2,800 lbs with a light nose and near-perfect balance, it does not need brutally stiff springs to feel planted — a well-damped, moderately sprung setup usually outperforms a slammed, over-sprung one on real roads. That is why we point most street customers toward the Hipermax S or the Tein Flex Z and reserve the stiffest Hipermax R settings for track duty. If you are building a dedicated time-attack or track car, the R's inverted monotube and Super Response Fluid earn every dollar; if you want a sharp street FD that you can still drive to a car meet, the S and the Flex Z deliver most of the benefit for a lot less money. Customers who have added our suspension upgrades consistently tell us the coilover swap is the mod that finally made their FD feel new again.