Description
Nissan S13 Silvia 240SX (89-94) BC Racing ZX coilover kit 6/4 kg/mm
The BC Racing ZX coilover kit S13 (part number D-12-ZX) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Nissan Silvia, 180SX, 200SX and 240SX on the S13 platform, model years 1989 to 1994. The spring rate is 6 kg/mm front and 4 kg/mm rear.
The kit is built for S13 drivers who take part seriously in competition: long sessions on track or demanding drift events. In the ZX series, BC Racing combines the DS and the ER in an upright monotube with a dual piston and an external reservoir.
What sets the ZX apart is the 3-way adjustment. You adjust low-speed compression in 20 clicks, high-speed compression in 12 clicks and rebound in 30 clicks. This lets you fine-tune the weight transfer of your Silvia, 180SX, 200SX or 240SX in detail, separately from how the car has to move over kerbs and bumps.
The kit comes with a spring rate of 6/4 kg/mm and uses race oil with a very high viscosity index, so the damping remains stable even after a long session. According to BC Racing, the kit also fits the A31.
Key benefits
- 3-way adjustable: low-speed and high-speed compression and rebound each adjustable separately.
- External reservoir: extra oil volume for consistent damping during long sessions.
- Dual piston: more control over how the damper responds at different speeds.
- Digressive characteristic: tight in roll and dive, more supple with fast wheel movements.
- Race oil with a high viscosity index: less loss of damping when it gets hot.
- Replaceable upper mount: with camber plates, rubber top mounts optional.
- Combination of DS and ER: the properties of two series in one kit.
- Rebuildable: made to be rebuilt season after season.
Suitable for
Nissan Silvia, 180SX, 200SX and 240SX on the S13 platform, model years 1989 to 1994
- Competitive track work and long sessions
- Demanding drifting where you want to adapt the setup for each track
- Drivers who want to go further than what a 1-way or 2-way damper offers
Technical specifications
- Manufacturer: BC Racing
- Part number: D-12-ZX
- Series: ZX, competition track and drift
- Spring rate front/rear: 6/4 kg/mm
- Damper design: upright monotube with dual piston and external reservoir, digressive
- Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression, 30 clicks rebound
- Ride height: infinitely adjustable via the damper body
- Top mounts: replaceable upper mount, camber plates, 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. Noise is not covered by the warranty
Fitting and delivery
The ZX replaces the original struts and dampers all round. When fitting, also plan a good location for the reservoirs and, after setting the ride height, have the wheel alignment reset. Start with the base setting and change only one click setting at a time per session. The delivery time is 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 keep you informed.
With three separate adjustments, you decide how the S13 turns in, lands and extends again, instead of the damper.
Why choose this ZX coilover kit S13?
If you already drive with a 2-way damper and notice that you want the compression on kerbs to be different from that on turn-in, the ZX is the next step. The separate high-speed compression gives you that freedom, while the external reservoir ensures that the setup still works after twenty minutes just as it did on the first lap.
BC Racing coilover kits for the Nissan S13
Overview of the BC Racing series for the Nissan S13 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 | D-12-BR-RA | 6/4 | 30 clicks, linear | Road with the occasional track day |
| DS | D-12-DS-DA | 6/4 | 30 clicks, digressive | Track-focused, sporty road use |
| RM | D-12-RM-MA, inverted | 10/8 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER | D-12-ER, camber/caster top mounts | 8/6 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX (this kit) | D-12-ZX | 6/4 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
| ZR | D-12-ZR | 6/4 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
Frequently asked questions
What is the difference between the BC Racing ZX and ER for the Nissan S13?
The ZX is 3-way adjustable and the ER 2-way. The ER adjusts compression and rebound separately in 30 clicks; the ZX coilover kit S13 additionally splits the compression into low and high speed, so you can fine-tune even more precisely.
Is the BC Racing ZX coilover kit S13 suitable for the road?
Yes, it does work on the road, but the ZX was developed for competition. You get the most out of this kit on track or when drifting.
What is the delivery time of this BC Racing ZX coilover kit for the Nissan S13?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If it is out of stock, you can still order and we will let you know when the kit arrives.
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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