Description
Mazda NA/NB MX-5 Miata (89-05) BC Racing DS coilover kit 7/5 kg/mm
The BC Racing DS coilover kit MX-5 NA/NB (part number N-04-DS-DS) 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.
The DS series is the track-focused coilover kit from BC Racing, for anyone who regularly takes an MX-5 NA or NB on track but also keeps driving the car on the road. The difference from the BR lies in the piston: the DS uses a digressive piston that damps extra firmly at low piston speeds, between 0 and 50 mm/s.
In practice the roadster therefore rolls less on turn-in and dives less under braking. You adjust the damping in 30 clicks, you set the ride height independently of the spring preload, and the satin chrome damper bodies are the hallmark of the DS.
Key benefits
- Digressive piston: firmer damping between 0 and 50 mm/s for a calm body.
- 30-click damping adjustment: compression and rebound together, adjustable per damper.
- Ride height independent of spring preload: adjustable via the damper body.
- Spring rate 7/5 kg/mm: the same spring stiffness as the BR kit for the NA/NB.
- Concave lower lock ring: the set ride height stays locked.
- Satin chrome damper bodies: the recognisable finish of the DS series.
- Rubber top mounts at the front: rubber or the original mounting at the rear.
- 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)
- Regular track days and autocross
- Sporty road use with a track-focused setup
- More control than the BR, without an external reservoir
Technical specifications
- Manufacturer: BC Racing
- Part number: N-04-DS-DS
- Series: DS, digressive and track-focused
- Spring rate front/rear: 7/5 kg/mm
- Damper design: monotube with digressive piston, satin chrome damper body
- Damping: 30 clicks, compression and rebound simultaneously
- Ride height: adjustable via the damper body, independent of the spring preload
- Top mounts: rubber top mounts at the front, rubber or the original mounting at the rear
- 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-focused series, noise is not covered by the warranty
Fitting and delivery
The coilover kit is made specifically for the MX-5 NA/NB and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic and having the wheel alignment checked after setting the height. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing is temporarily out of stock, you can still order; we will let you know when the kit is shipped.
The BC Racing DS series uses a digressive piston that damps more firmly between 0 and 50 mm/s, with 30 clicks of adjustment for compression and rebound together.
Why choose this DS coilover kit MX-5 NA/NB?
An NA or NB is a rewarding car on track, as long as the suspension keeps the movements in check. The digressive damping of this kit keeps the body calm in fast sequences of corners, while with 30 clicks you decide yourself how firm the car is. You do not need reservoirs for this, and the kit remains comfortable for everyday driving.
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 (this kit) | 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 | N-04-ZX | 7/5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
Frequently asked questions
Is the BC Racing DS coilover kit suitable for both the Mazda MX-5 NA and the NB?
Yes. BC Racing UK lists this DS kit for the MX-5 NA and NB from 1989 to 2005, so for both generations. If in doubt, we are happy to check it using your chassis number.
What is the difference between the BC Racing DS and ER for the Mazda MX-5 NA/NB?
The DS adjusts compression and rebound together in 30 clicks and has no external reservoir; the ER has an external reservoir and adjusts compression and rebound each separately in 30 clicks. For the NA/NB, the ER also has stiffer springs: 8/6 kg/mm compared with 7/5 kg/mm on the DS. If you are looking for a track-focused kit that can also be driven on the road, the DS coilover kit MX-5 NA/NB is the better fit.
Can I drive the BC Racing DS coilover kit for the MX-5 NA/NB every day?
Yes, you can, but the setup is track-focused. If you mainly drive on the road and only go to the track now and then, the BR series is a better match.
How long is the delivery time of the BC Racing DS coilover kit for the Mazda MX-5 NA/NB?
Normally 1 to 2 weeks, as long as the manufacturer has stock. If BC Racing does not have the kit in stock straight away, you can still order it and we will keep you informed.
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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