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Description

BMW E46 3 Series Sedan/Coupe/Touring/Compact (98-06) BC Racing HM coilover kit 8/10 kg/mm

The BC Racing HM coilover kit E46 (part number I-02-HM) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E46 Sedan, Coupe, Touring and Compact with rear-wheel drive, model years 1998 to 2006. The spring rate is 8 kg/mm front and 10 kg/mm rear.

The kit brings together two BC Racing technologies: the inverted dampers of the RM series and the external reservoir with 2-way adjustment of the ER series. The result is a kit for serious track work that is both stiff and precisely adjustable.

On MacPherson struts, such as the front axle of the E46, the HM uses an inverted dual-piston monotube. The external reservoir is connected with PTFE-coated braided steel lines and contains the second piston. Compression and rebound each have their own adjuster with 30 clicks.

The spring rate is 8/10 kg/mm. The damping is digressive and the dampers are filled with synthetic oil, so they keep working the same way during long sessions.

Key benefits

• Inverted plus reservoir: the stiffness of the RM combined with the adjustability of the ER.
• 2-way adjustable: compression and rebound 30 clicks each, independent of each other.
• Braided steel lines: PTFE-coated, between damper and reservoir.
• Second piston in the reservoir: the dual piston is split between damper and reservoir.
• Digressive damping: tight during weight transfer, compliant on sharp impacts.
• Synthetic oil: consistent damping, even when things get hot.
• Camber plates: rubber top mounts are available as an option.
• Spring rate 8/10 kg/mm: tuned for track use with the E46.

Suitable for

BMW 3 Series E46 Sedan, Coupe, Touring and Compact, model years 1998 to 2006, with rear-wheel drive (not for the M3 and the Convertible)

• Serious track work and club racing
• Time attack and long sessions
• Drivers looking for a stiff front strut and 2-way adjustment in one kit

Technical specifications

• Manufacturer: BC Racing
• Part number: I-02-HM
• Series: HM, inverted with external reservoir
• Spring rate front/rear: 8/10 kg/mm
• Damper design: inverted monotube on MacPherson struts, dual piston, external reservoir with PTFE-coated braided steel lines, digressive
• Damping: 2-way, 30 clicks of compression and 30 clicks of rebound, independent
• 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 is not covered by the warranty

Fitting and delivery

The kit replaces the original dampers and springs front and rear. When fitting, take the time to position the reservoirs and lines neatly, so that they do not touch anything during compression and at full steering lock. Have the E46 aligned after setting up. BC Racing advises periodic greasing for the HM series and 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 the kit is not in stock, you can still order and we will keep you informed.

The HM gives an E46 a front strut that does not flex and dampers that you can tune per direction: exactly the combination you are looking for when every tenth counts.

Why choose this HM coilover kit E46?

Because then you do not have to choose between the stiffness of an inverted kit and the adjustability of a reservoir kit. For an E46 that is regularly on track and where you want to adjust the setup for each circuit, the HM gives you both in one package.

BC Racing coilover kits for the BMW E46 Sedan, Coupe, Touring and Compact

Overview of the BC Racing series for the BMW E46 Sedan, Coupe, Touring and Compact supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.

For a True Rear setup of the BMW E46 Sedan, Coupe and Touring, BC Racing has separate kits. Their part numbers start with I-31. For the E46 Convertible, BC Racing has its own kit under part number I-90.

Frequently asked questions

What is the difference between the BC Racing HM and RM for the E46?

The HM coilover kit E46 adds a reservoir with braided steel lines and lets you set compression and rebound separately from each other. The RM is also inverted, but has no external reservoir and one adjuster with 30 clicks.

What is the difference between the BC Racing HM and ER for the E46?

The HM has inverted dampers, the ER does not; both have a reservoir and 2-way adjustment. The HM combines the two.

Is the BC Racing HM coilover kit for the E46 suitable for the road?

No, not as a road kit: BC Racing recommends the HM series less for road use than the BR, DS, ER or ZX. The kit is made for serious track work and needs periodic greasing.

Does this BC Racing HM coilover kit fit an E46 Touring or Convertible?

Yes for the Touring, and also for the Compact. No for the Convertible: for that, BC Racing has its own kit under part number I-90. This I-02 kit is released for all rear-wheel drive E46 versions except the M3 and the Convertible.

What is the delivery time of this BC Racing HM coilover kit?

The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out there, you can still order and we will let you know when it is here.

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.