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Description

Mazda NA/NB MX-5 Miata (89-05) BC Racing ZX coilover kit 7/5 or 10/8 kg/mm

The BC Racing ZX coilover kit MX-5 NA/NB (part number N-04-ZX) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Mazda MX-5 NA and NB (Miata), model years 1989 to 2005. You choose the spring rate when ordering: 7/5 or 10/8 kg/mm front/rear.

The ZX series combines the upright monotube of the DS with the external reservoir of the ER and adds a third adjustment. BC Racing developed this kit for competitive track work, long sessions and demanding drifting.

You set the compression separately for low speed (20 clicks) and high speed (12 clicks), and the rebound in 30 clicks. BC Racing supplies this ZX kit for the MX-5 NA/NB with two spring rates and the same ZX construction; the difference is in the springs. The 7/5 kg/mm version has softer springs, with the same spring stiffness as the BR and DS kits for this car: an option for anyone who wants the adjustment options of the ZX but wants to keep that spring stiffness. The 10/8 kg/mm version is the ZX kit that BC Racing UK recommends for this car.

Key benefits

• 3-way adjustable: 20 clicks of low-speed compression, 12 clicks of high-speed compression and 30 clicks of rebound.
• External reservoir: upright monotube with twin piston.
• Digressive damping: a lot of control over slow body movements.
• Racing oil: with an ultra-high viscosity index.
• Replaceable upper mounting: camber plates on suitable kits, rubber top mounts optional.
• Steplessly adjustable ride height: via the damper body.
• Spring rate of your choice: 7/5 kg/mm, softer and the same as the BR and DS kits, or 10/8 kg/mm, the ZX kit that BC Racing UK recommends for the NA/NB.
• Rebuildable: the dampers can be rebuilt.

Suitable for

Mazda MX-5 NA and NB (Miata), model years 1989 to 2005: both the first generation (NA) and the second generation (NB)

• Competition and long track sessions
• Demanding drifting
• Drivers who want to tune high-speed and low-speed compression separately, with the spring stiffness of the BR and DS kits (7/5) or with stiffer springs (10/8)

Technical specifications

• Manufacturer: BC Racing
• Part number: N-04-ZX
• Series: ZX, 3-way with external reservoir for competition use
• Spring rate front/rear: 7/5 or 10/8 kg/mm (choose when ordering)
• Damper design: upright monotube with twin piston and external reservoir, digressive, racing oil with ultra-high viscosity index
• Damping: 3-way: 20 clicks low-speed compression, 12 clicks high-speed compression and 30 clicks rebound
• Ride height: steplessly adjustable via the damper body
• Top mounts: replaceable upper mounting, camber plates on suitable kits, rubber top mounts optional
• Contents: dampers and springs front and rear, lower mounts, top mounts where applicable, adjustment spanners and warranty card with serial number
• Warranty: 1 year on manufacturing defects; with this competition series, noise is not covered by the warranty

Fitting and delivery

The kit is vehicle-specific for the MX-5 NA/NB and replaces the original dampers and springs. An experienced mechanic is the right person for the job; after setting the ride height, have the wheel alignment reset as well. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing does not have it in stock, you simply order and we will let you know when it has arrived.

The BC Racing ZX series is 3-way adjustable: 20 clicks of low-speed compression, 12 clicks of high-speed compression and 30 clicks of rebound.

Why choose this ZX coilover kit MX-5 NA/NB?

With 3-way adjustment you tune the response to slow body movements separately from the response to sharp impacts over kerbs and bumps. For an NA or NB that is driven right at the limit, this gives extra scope to find the balance for each circuit or drift track. If you choose 10/8 kg/mm, the stiff springs keep the light roadster firmly in place. With 7/5 kg/mm you combine the same adjustment options with the spring stiffness that BC Racing also uses for the BR and DS for the NA/NB.

BC Racing coilover kits for the Mazda MX-5 NA/NB

Overview of the BC Racing series for the Mazda MX-5 NA/NB supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.

Frequently asked questions

Does the BC Racing ZX coilover kit fit both the Mazda MX-5 NA and the NB?

Yes. BC Racing UK releases this ZX kit, with 7/5 as well as with 10/8 kg/mm, for the MX-5 NA and NB from 1989 to 2005. Let us know if you are unsure, and we will check your car using the chassis number.

What is the difference between the BC Racing ZX with 7/5 and with 10/8 kg/mm for the Mazda MX-5 NA/NB?

The difference is only in the spring rate; both versions have part number N-04-ZX and the same ZX construction. With 7/5 kg/mm you choose the softer version, which matches the spring stiffness of the BR and DS kits. The 10/8 kg/mm version is the ZX coilover kit MX-5 NA/NB that BC Racing UK recommends as standard. So it depends on how stiff you want the car to be. If in doubt, please contact us.

What is the difference between the BC Racing ZX and ER for the MX-5 NA/NB?

The ZX is 3-way adjustable, the ER 2-way. The ZX splits the compression into low and high speed and is intended for competition, long sessions and drifting; the ER adjusts compression and rebound in 30 clicks each. For the NA/NB, the ER has springs of 8/6 kg/mm.

What is the delivery time of the BC Racing ZX coilover kit for the Mazda MX-5 NA/NB?

The delivery time is 1 to 2 weeks as long as the manufacturer has stock, for both spring rates. If the kit is temporarily unavailable from BC Racing, you can still order it and we will get back to you with the delivery date.

Delivery outside the European Union: different shipping costs may apply. Don’t worry: we will email you as soon as possible after your order and agree the shipping with you. You are not committed to anything without your consent.