Is it time to replace your race suit? Let’s get you track-ready. BC Racing HM Series Coilovers Explained
The remote reservoir on an HM kit sits outside the damper body, connected by a short hose. That extra volume keeps the damper oil from heating up as quickly under sustained load. On a car being driven hard through a long lap, the dampers are working continuously through braking zones and fast corners, and heat has a real effect on how the oil flows through the valving. The HM addresses that by giving it more space to dissipate that heat before the feel starts to drift mid-session.
HM covers the same 8 makes and the same 42 fitments as ZR, which is the three-way adjustable series at the top of the BC range. If a car shows HM on our fitment list, it almost certainly shows ZR on the same page, and the question usually comes down to which problem the customer is solving: finer adjustment on ZR, or heat management on HM.
Which BC series fits HM?
| Make | HM listings |
|---|---|
| BMW | 13 |
| Subaru | 10 |
| Honda | 8 |
| Mitsubishi | 4 |
| Nissan | 3 |
| Toyota | 2 |
| Scion | 1 |
| Mazda | 1 |
HM listings by make (42 total, across 8 makes)
Who ends up on HM
Track customers who lap the same circuit regularly enough to notice the car changing feel through a long stint are the ones who usually ask about HM. A damper getting warm over several laps is gradual rather than dramatic. What worked at 10 clicks starts to feel like it should be 8, and the session ends before anyone pins down why. The reservoir pushes that threshold further out without changing the adjustment range or the number of dials on the kit.
Every make that carries HM is a dedicated performance platform. BMW’s M3 through the E36, E46, E90/E92 and F80/F82 generations, Subaru’s Impreza WRX and STI from the GC8 to the current VB plus both BRZ generations, Honda’s Civic Type R and a run of earlier Civic and Integra fitments, Mitsubishi’s full Evo lineage, Nissan’s S13 to S15 Silvia, Toyota’s 86 and GR86, and single fitments for the Scion FR-S and the Mazda RX-7 FC3S. All track-focused chassis. If a car is not on that list, BR or RM is the range to look at.
One thing BMW buyers need to check
Three BMW E90 and E92 listings carry a note buried in the product title: “Remove Strut Bar For Hm”. It means exactly that. The factory strut brace sits where the HM reservoir goes, and it has to come out before the kit fits. This is a physical clearance requirement, not a handling note. It applies to the E90/E92 M3, the E92 Coupe and the E90/E92 Saloon fitments. The E36 and E46 listings in the HM range do not carry that note and fit without modification.
Worth checking the specific listing title before booking the fitting appointment, since a fitter who does not know it is coming will have to pause the job to source a delete bracket or adapt the brace.
Where HM turns up across the range
BMW carries 13 HM listings, covering the 3 Series and M3 from the E36 through to the F80/F82. Subaru follows with 10, the full WRX and STI lineage plus both BRZ generations. Honda carries 8 fitments across the Civic, Civic Type R and Integra/RSX chassis codes. Mitsubishi’s Evo I through X at 4 listings, Nissan’s S13, S14 and S15 Silvia at 3, Toyota’s GT86 and GR86 at 2, and one listing each for the Scion FR-S and the Mazda RX-7 FC3S. The full breakdown is in the table below.
A cross-section of what's live
Eleven examples across all eight makes, checked live and in stock: BMW’s F80/F82 M3/M4 and the E46 M3, Subaru’s current VB WRX and ZD8 BRZ, Honda’s Civic Type R FD2 and the FC/FK Civic, Mitsubishi’s Evo X, the Nissan S15 Silvia 200SX, Toyota’s GR86, the Scion FR-S and the Mazda RX-7 FC3S.
HM across the range
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BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page -
BC Racing, BR Series Coilovers, ER Series Coilovers, HM Series Coilovers, RM Series Coilovers, Suspension, ZR Series Coilovers, ZX Series Coilovers
From £874.17 Excl. VATPayPal CreditKlarna ReadyNew for 2026Select options This product has multiple variants. The options may be chosen on the product page
Final thoughts
If your car shows HM on our fitment list, ZR almost certainly sits alongside it, and the choice usually comes down to what the car is being used for. HM is the one to ask about when sustained lapping and damper consistency are the priority. ZR is the one to look at when finer per-damper adjustment matters more. Our BMW guide covers the full 13-listing BMW HM range in detail, and our BC Racing series guide covers where HM sits against BR, RM, ER, ZX and ZR.
Cameron, GSM Performance
