Description
BC Racing ZX coilover kit Mazda MX-5 Miata NA/NB (89-05) 7/5 kg/mm
The BC Racing ZX coilover kit MX-5 NA/NB 7/5 (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. The spring rate is 7 kg/mm front and 5 kg/mm rear.
This is the ZX kit for the MX-5 NA and NB with the softer 7/5 kg/mm springs, the same spring stiffness as the BR and DS kits for this car. You get the complete ZX construction: an upright monotube with twin piston, an external reservoir and racing oil with an ultra-high viscosity index.
The ZX series is 3-way adjustable and intended for competitive track work, long sessions and demanding drifting. With the lower spring rate, this version is an option for anyone who wants those adjustment options but wants to keep the spring stiffness of the BR and DS kits.
Key benefits
- Spring rate 7/5 kg/mm: softer than the ZX version with 10/8 kg/mm.
- 3-way damping: low-speed compression (20 clicks), high-speed compression (12 clicks) and rebound (30 clicks).
- External reservoir: the ZX combines the upright monotube of the DS with the reservoir of the ER.
- Digressive characteristic: firm damping at slow body movements.
- Racing oil: with an ultra-high viscosity index.
- Steplessly adjustable ride height: set via the damper body.
- Replaceable upper mounting: camber plates on suitable kits, rubber top mounts optional.
- 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)
- Track sessions and competition with a 3-way setup
- Drifting with an MX-5 NA or NB
- Drivers who want to keep a spring stiffness of 7/5 kg/mm
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 kg/mm
- 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
This ZX kit is also vehicle-specific: it replaces the original dampers and springs of the NA/NB. We recommend having it fitted by an experienced mechanic and then checking the wheel alignment, because it changes as soon as you adjust the ride height. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. No stock at BC Racing? You can still order, and we will keep you informed.
The BC Racing ZX kit N-04-ZX for the Mazda MX-5 NA/NB is available with 10/8 kg/mm or with 7/5 kg/mm; this version has 7/5 kg/mm.
Why choose this ZX coilover kit MX-5 NA/NB 7/5?
A 3-way coilover kit does not necessarily need stiff springs. With 7/5 kg/mm you combine the adjustment options of the ZX with the spring stiffness that BC Racing also uses for the BR and DS for the NA/NB. This way you tune the damping for each circuit or drift event, with low-speed and high-speed compression each adjustable separately.
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.
| Series | Part number | Springs f/r | Damping | Intended for |
|---|---|---|---|---|
| BR | N-04-BR-RS | 7/5 | 30 clicks, linear, rubber top mounts front | Road with the occasional track day |
| DS | N-04-DS-DS | 7/5 | 30 clicks, digressive, rubber top mounts front | Track-focused, sporty road use |
| ER | N-04-ER | 8/6 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | N-04-ZX | 10/8 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
| ZX (this kit) | N-04-ZX | 7/5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
Frequently asked questions
Does this BC Racing ZX coilover kit with 7/5 kg/mm fit the Mazda MX-5 NA and NB?
Yes. BC Racing UK lists this ZX kit with 7/5 kg/mm for the MX-5 NA/NB from 1989 to 2005. If you are not sure which version you have, please contact us.
Should I choose 7/5 or 10/8 kg/mm for the BC Racing ZX for the MX-5 NA/NB?
That depends on how stiff you want the car to be: 7/5 kg/mm is the softer choice, 10/8 kg/mm is the ZX kit that BC Racing UK recommends as standard for the NA/NB. If you want to keep the spring stiffness of the BR and DS kits, the ZX coilover kit MX-5 NA/NB 7/5 is the logical choice.
What is the difference between the BC Racing ZX and DS for the Mazda MX-5 NA/NB?
The ZX has an external reservoir and 3-way adjustment; the DS has no reservoir and adjusts compression and rebound together in 30 clicks. With 7/5 kg/mm, this ZX kit and the DS kit for the NA/NB have the same spring rate.
What is the delivery time of the BC Racing ZX coilover kit 7/5 for the Mazda MX-5 NA/NB?
Normally 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily out of stock, you can still order and we will let you know when it is coming.
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.
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