Description
Mazda NA/NB MX-5 Miata (89-05) BC Racing ER coilover kit 8/6 kg/mm
The BC Racing ER coilover kit MX-5 NA/NB (part number N-04-ER) 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 8 kg/mm front and 6 kg/mm rear.
The ER series is the BC Racing coilover kit with external reservoir, intended for serious track and competition use. For the MX-5 NA and NB, it is the choice for anyone who uses the car mainly on track and wants to tune the damping in detail.
Here you set compression and rebound independently of each other, each in 30 clicks. The dampers have a twin piston, a digressive characteristic and fully synthetic oil with an ultra-high viscosity index. The ride height is steplessly adjustable via the damper body.
Key benefits
- 2-way adjustable: compression and rebound each separately in 30 clicks.
- External reservoir: monotube dampers with a twin piston and a separate reservoir.
- Digressive damping: firm control over body movements on track.
- Fully synthetic oil: with an ultra-high viscosity index.
- Steplessly adjustable ride height: set via the damper body.
- Concave lock ring: the set height stays locked.
- Spring rate 8/6 kg/mm: stiffer than the BR and DS kits 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)
- Serious track use and club races
- Track days where you want to tune compression and rebound separately
- An MX-5 NA/NB built mainly for the track
Technical specifications
- Manufacturer: BC Racing
- Part number: N-04-ER
- Series: ER, external reservoir for serious track and competition use
- Spring rate front/rear: 8/6 kg/mm
- Damper design: monotube with twin piston and external reservoir, digressive, fully synthetic oil with ultra-high viscosity index
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, adjustable independently of each other
- Ride height: steplessly adjustable via the damper body
- Top mounts: 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 track series, noise is not covered by the warranty
Fitting and delivery
This kit is made for the MX-5 NA/NB and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic, and after setting the ride height, having the camber and toe adjusted again. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing temporarily has the kit out of stock, you can still order it; we will keep you informed about delivery.
The BC Racing ER series has an external reservoir and adjusts compression and rebound independently of each other, each in 30 clicks.
Why choose this ER coilover kit MX-5 NA/NB?
Anyone who drives an NA or NB seriously on track wants to be able to tune compression and rebound independently of each other. This kit makes that possible: you control how the car reacts to bumps and kerbs separately from how it rebounds. Together with the stiffer 8/6 kg/mm springs, you get suspension that you can set up for each circuit.
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 (this kit) | 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 | N-04-ZX | 7/5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
Frequently asked questions
Does the BC Racing ER coilover kit fit every Mazda MX-5 NA and NB?
Yes, within model years 1989 to 2005. BC Racing UK lists this ER kit for the MX-5 NA/NB without exceptions; if in doubt, contact us and we will check your car.
What is the difference between the BC Racing ER and ZX for the Mazda MX-5 NA/NB?
The ER is 2-way adjustable, the ZX is 3-way adjustable. On the ZX you split the compression into low speed (20 clicks) and high speed (12 clicks), alongside 30 clicks of rebound. The ZX is intended for competition, long sessions and drifting; the ER coilover kit MX-5 NA/NB is made for serious track and competition use with a simpler setup.
What is the spring rate of the BC Racing ER coilover kit for the MX-5 NA/NB?
The spring rate is 8 kg/mm front and 6 kg/mm rear. That is stiffer than the BR and DS kits for the NA/NB, which are supplied with 7/5 kg/mm. If you want a different spring stiffness, contact us and we will look at the options.
What is the delivery time of the BC Racing ER coilover kit for the MX-5 NA/NB?
Expect 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out at BC Racing, you can still order and we will let you know the expected 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.
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