Description
Mazda FC3S RX-7 (85-91) BC Racing ER coilover kit 9/7 kg/mm
The BC Racing ER coilover kit RX-7 FC (part number N-06-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Mazda RX-7 FC3S, model years 1985 to 1991. The spring rate is 9 kg/mm front and 7 kg/mm rear.
The ER series is BC Racing’s 2-way adjustable coilover kit with an external reservoir, for an RX-7 FC that is driven seriously on track or in competition. Here you adjust compression and rebound separately, in 30 clicks each.
The monotube dampers have a dual piston, an external reservoir and fully synthetic oil with an ultra-high viscosity index. The damping is digressive. At 9 kg/mm front and 7 kg/mm rear, the springs are stiffer than on the other BC Racing kits for the FC.
Key benefits
- 2-way adjustable: compression and rebound in 30 clicks each, independently.
- External reservoir: extra oil volume outside the damper.
- Dual piston, digressive: control during slow body movements.
- Fully synthetic oil: with an ultra-high viscosity index.
- Spring rate 9/7 kg/mm: a firm setup for track work with the FC.
- Camber plates on suitable kits: rubber top mounts and a check valve optional.
- Concave lock ring: the ride height stays locked.
- Rebuildable: the dampers can be rebuilt.
Suitable for
Mazda RX-7 FC3S, model years 1985 to 1991. BC Racing lists no exclusions within this generation.
- Club racing and serious track days with the FC
- Tuning compression and rebound independently of each other
- An FC built mainly for the track
Technical specifications
- Manufacturer: BC Racing
- Part number: N-06-ER
- Series: ER, 2-way with external reservoir
- Spring rate front/rear: 9/7 kg/mm
- Damper design: monotube with dual piston and external reservoir, digressive
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, independent
- 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; noise from this track-focused series is not covered by the warranty
Fitting and delivery
The kit is vehicle-specific and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic, making sure the reservoirs sit clear, and having the wheel alignment redone after setting the ride height. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily not available from stock, you can still order and we will let you know when it arrives.
The ER kit for the RX-7 FC has 9/7 kg/mm springs and 2-way adjustment with 30 clicks compression and 30 clicks rebound.
Why choose this ER coilover kit RX-7 FC?
Because when doing track work with an FC you want to be able to adjust the balance between front and rear precisely. With separate compression and rebound you do that in a more targeted way than with a 1-way kit, and the 9/7 kg/mm springs are stiffer than those of the BR, DS, RM and ZX kits for the FC.
BC Racing coilover kits for the Mazda RX-7 FC3S
Overview of the BC Racing series for the Mazda RX-7 FC3S 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-06-BR-RA | 6/5 | 30 clicks, linear, pillowball top mounts front | Road with the occasional track day |
| DS | N-06-DS-DA | 8/6 | 30 clicks, digressive, pillowball top mounts front | Track-focused, sporty road use |
| RM | N-06-RM-MA | 8/6 | 30 clicks, digressive, synthetic oil, pillowball top mounts front | Track days, hill climbs, tarmac rally |
| ER (this kit) | N-06-ER | 9/7 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | N-06-ZX | 8/6 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
For the Mazda RX-7 FD3S, BC Racing has separate kits. Their part numbers start with N-02.
Frequently asked questions
What is the difference between the BC Racing ER and ZX for the Mazda RX-7 FC?
The ER is 2-way adjustable, the ZX 3-way. The ZX splits compression into low speed (20 clicks) and high speed (12 clicks), alongside 30 clicks rebound; the ER has 30 clicks compression and 30 clicks rebound. For the FC the ER has 9/7 kg/mm springs, the ZX 8/6 kg/mm.
Does the BC Racing ER coilover kit for the RX-7 FC also fit the Mazda RX-7 FD3S?
No. This kit is for the Mazda RX-7 FC from 1985 to 1991; BC Racing lists no exclusions within that generation. For the FD3S (1991 to 2002) there is a separate ER kit with part number N-02-ER.
Can I set compression and rebound separately on the BC Racing ER coilover kit RX-7 FC?
Yes. The ER coilover kit RX-7 FC is 2-way adjustable: 30 clicks compression and 30 clicks rebound, independently of each other. This lets you tune the damping for each circuit and each session.
What is the delivery time of the BC Racing ER coilover kit for the Mazda RX-7 FC?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out, you can still order it and we will keep you informed about 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.
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