Description
Subaru ZC6 BRZ (12-21) BC Racing HM coilover kit 6/4 kg/mm
The BC Racing HM coilover kit BRZ ZC6 (part number F-20-HM) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Subaru BRZ (ZC6) with rear-wheel drive, model years 2012 to 2021. The spring rate is 6 kg/mm front and 4 kg/mm rear.
The HM series combines the inverted design of the RM with the double piston and external reservoir of the ER. BC Racing supplies it for the Subaru BRZ (ZC6) with 6 kg/mm springs front and 4 kg/mm rear, for serious track use.
The second piston sits in the external reservoir; PTFE-coated, braided steel lines connect it to the damper. Compression and rebound are 2-way adjustable, each in 30 clicks, with a digressive characteristic and synthetic oil.
Key benefits
- RM and ER in one: inverted monotube with double piston and external reservoir.
- 2-way adjustable: compression and rebound independently of each other, 30 clicks each.
- PTFE-coated braided steel lines: between damper and reservoir.
- Digressive damping: firm at low piston speeds.
- Synthetic oil: in the dampers of the HM series.
- Camber plates: rubber top mounts optional.
- Spring rate 6/4 kg/mm: as BC Racing lists it for the BRZ ZC6.
Suitable for
Subaru BRZ (ZC6) with rear-wheel drive, model years 2012 to 2021. Not for the second generation BRZ (ZD8) from 2022.
- Serious track use with the BRZ
- Drivers looking for an inverted damper with 2-way adjustment
- Track days with long sessions
Technical specifications
- Manufacturer: BC Racing
- Part number: F-20-HM
- Series: HM, combination of RM and ER, for serious track use
- Spring rate front/rear: 6/4 kg/mm
- Damper design: inverted monotube with double piston, external reservoir with the second piston and PTFE-coated braided steel lines, digressive, synthetic oil
- Damping: 2-way, compression and rebound independently of each other, 30 clicks each
- Ride height: steplessly adjustable via the damper body
- Top mounts: 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; damper noise from track use is not covered by the warranty
Fitting and delivery
The HM kit is vehicle-specific and replaces the original dampers and springs front and rear of the BRZ ZC6. We recommend having it fitted by an experienced mechanic and having the wheel alignment checked after setting the ride height. According to BC Racing UK, the HM series also needs periodic greasing, and BC Racing recommends it less for road use than the BR, DS, ER or ZX. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing has no stock, you can still order; we will keep you informed of the delivery date.
The BC Racing HM series combines the inverted damper of the RM with the double piston and external reservoir of the ER.
Why choose this HM coilover kit BRZ ZC6?
The HM is for BRZ drivers who want the inverted design of the RM but also want to set compression and rebound separately. You get 2-way adjustment with an external reservoir, on a spring rate of 6/4 kg/mm that BC Racing lists for the BRZ. If you also use the car a lot on the road, look at the ER or ZX instead.
BC Racing coilover kits for the Subaru BRZ (ZC6)
Overview of the BC Racing series for the Subaru BRZ (ZC6) 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 |
|---|---|---|---|---|
| RM | F-20-RM-MA | 6/6 | 30 clicks, digressive, synthetic oil, pillowball top mounts front | Track days, hill climbs, tarmac rally |
| ER | F-20-ER | 6/4 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| HM (this kit) | F-20-HM | 6/4 | 2-way, 30 clicks per direction, external reservoir | Serious track use |
| ZX | F-20-ZX | 5/5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
| ZR | F-20-ZR | 6/4 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
For the Toyota GT86 (ZN6), BC Racing has separate kits. Their part numbers start with C-89.
Frequently asked questions
What is the difference between the BC Racing HM and ER for the Subaru BRZ ZC6?
The difference is the inverted design: the HM takes it over from the RM series. On the HM coilover kit BRZ ZC6, the second piston also sits in the external reservoir, connected via PTFE-coated lines. Both are 2-way adjustable with 30 clicks per direction and 6/4 kg/mm springs; for road use BC Racing recommends the ER over the HM.
Is the BC Racing HM coilover kit for the BRZ ZC6 suitable for road use?
Not as a first choice: BC Racing UK recommends the HM less for road use than the BR, DS, ER or ZX, and the series requires periodic greasing. It is intended for serious track use.
Does the BC Racing HM coilover kit for the BRZ ZC6 also fit a Toyota GT86?
Not according to BC Racing: BC Racing UK only lists the F-20-HM for the Subaru BRZ (ZC6) with rear-wheel drive, model years 2012 to 2021. For the Toyota GT86 (ZN6) we offer the C-89 kits; contact us if you are looking for an HM for the GT86.
What is the delivery time of the BC Racing HM for the Subaru BRZ ZC6?
The HM is delivered within 1 to 2 weeks as long as the manufacturer has stock. If BC Racing does not have the kit in stock, you can still order 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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