Description
BMW E90/E92 3 Series Sedan/Coupe RWD (05-11) BC Racing HM coilover kit 7/10 kg/mm
The BC Racing HM coilover kit E90 E92 (part number I-03-HM) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E90 Sedan and E92 Coupe with rear-wheel drive, excluding the M3, model years 2005 to 2011. The spring rate is 7 kg/mm front and 10 kg/mm rear.
The HM series from BC Racing combines the inverted design of the RM with the external reservoir and the 2-way adjustment of the ER. It is intended for serious track use with the BMW E90 or E92.
Each damper has a twin piston; the second piston sits in the external reservoir, which is connected via PTFE-coated braided steel lines. You set compression and rebound independently of each other, each in 30 clicks, and the spring rate is 7 kg/mm front and 10 kg/mm rear.
Key benefits
- Inverted design: the basis of the RM series, supplemented with an external reservoir.
- 2-way adjustable: compression and rebound independently of each other, each in 30 clicks.
- Twin piston: the second piston sits in the external reservoir.
- PTFE-coated braided steel lines: connect damper and reservoir.
- Digressive damping: firm during slow body movements.
- Synthetic oil: for stable damping when things get hot.
- Spring rate 7/10 kg/mm: the same as the ER kit for the E90 and E92.
- Camber plates: rubber top mounts optional.
Suitable for
BMW 3 Series E90 Sedan (2005 to 2011) and E92 Coupe (2006 to 2011) with rear-wheel drive; not for the M3 and not for the xDrive (xi) with four-wheel drive. For the E91 Touring and E93 Convertible, BC Racing has separate kits (I-17).
- Serious track use
- Drivers who want to combine the inverted design of the RM with 2-way adjustment
- E90 and E92 that are mainly driven on track
Technical specifications
- Manufacturer: BC Racing
- Part number: I-03-HM
- Series: HM, combination of RM and ER, for serious track use
- Spring rate front/rear: 7/10 kg/mm
- Damper design: inverted monotube with twin piston, external reservoir with PTFE-coated braided steel lines, digressive, synthetic oil
- Damping: 2-way, compression and rebound independently of each other, 30 clicks each
- Ride height: infinitely 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; 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. We recommend having it fitted by an experienced mechanic. BC Racing UK states that the HM series needs periodic greasing and does not recommend the HM for road use. After setting the ride height, have the wheel alignment adjusted again. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing temporarily has the kit out of stock, you can still order and we will let you know when it arrives.
The BC Racing HM kit I-03-HM for the BMW E90 and E92 combines the inverted design of the RM with the external reservoir and the 2-way adjustment of the ER.
Why choose this HM coilover kit E90 E92?
The HM is intended for anyone who uses their E90 or E92 seriously on track and wants to combine the inverted damper design of the RM with the setup options of a 2-way kit with reservoir. You set compression and rebound separately, and the synthetic oil keeps the damping stable. For a car that is mainly driven on the road, the BR or DS is a more logical choice.
BC Racing coilover kits for the BMW E90 Sedan and E92 Coupe
Overview of the BC Racing series for the BMW E90 Sedan and E92 Coupe 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 | I-03-BR-RA | 5.5/8 | 30 clicks, linear, pillowball top mounts front | Road with the occasional track day |
| DS | I-03-DS-DA | 5.5/8 | 30 clicks, digressive, pillowball top mounts front | Track-focused, sporty road use |
| RM | I-03-RM-MA | 5.5/12 | 30 clicks, digressive, synthetic oil, pillowball top mounts front | Track days, hill climbs, tarmac rally |
| ER | I-03-ER | 7/10 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| HM (this kit) | I-03-HM | 7/10 | 2-way, 30 clicks per direction, external reservoir | Serious track use |
| ZX | I-03-ZX | 10/12 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
| ZX | I-03-ZX | 5.5/8 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
| ZR | I-03-ZR | 6.5/10 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
| ZR | I-03-ZR | 7/10 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
For the BMW E91 Touring and E93 Convertible, BC Racing has separate kits. Their part numbers start with I-17.
Frequently asked questions
What is the difference between the BC Racing HM and ER coilover kit for the BMW E90 and E92?
The difference is in the design: the HM uses the inverted construction of the RM, the ER a monotube with twin piston. Both are 2-way adjustable with an external reservoir and have 7/10 kg/mm for the E90 and E92. In this way the HM coilover kit E90 E92 combines the RM and the ER in one kit.
Is the BC Racing HM coilover kit for the E90 and E92 suitable for road use?
No, it is not intended for that. BC Racing UK does not recommend the HM for road use and states that the series needs periodic greasing. For an E90 or E92 that is mainly driven on the road, the BR or DS is more suitable.
Which BMW E90 and E92 does the BC Racing HM coilover kit fit?
The E90 Sedan and E92 Coupe with rear-wheel drive. The M3 and the xDrive (xi) with four-wheel drive are not covered by this kit. For the E91 Touring and E93 Convertible, BC Racing has separate kits (I-17).
What is the delivery time of the BC Racing HM coilover kit for the BMW E90 and E92?
The HM is available within 1 to 2 weeks as long as the manufacturer has stock. If there is no stock, you can still order and we will tell you 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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