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Description

BMW E46 3 Series True Rear Sedan/Coupe/Touring (98-06) BC Racing HM coilover kit 6/5 kg/mm

The BC Racing HM coilover kit E46 True Rear (part number I-31-HM) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E46 Sedan, Coupe and Touring with rear-wheel drive, model years 1998 to 2006, in True Rear version. The spring rate is 6 kg/mm front and 5 kg/mm rear.

This inverted 2-way kit has external reservoirs, and the rear axle also gets a complete strut. The HM series combines the inverted dampers of the RM with the reservoir technology of the ER, for serious track use.

What True Rear means: from the factory, the E46 has a separate spring and a separate damper at the rear. This kit replaces that with a coilover with the spring around the damper, so you set the height in the same way at the front and rear. The standard HM without True Rear (I-02) leaves the original separate spring and damper in place at the rear.

On the MacPherson struts there is an inverted monotube with dual piston; the external reservoir is connected via PTFE-coated, steel-braided lines and contains the second piston. You adjust compression and rebound in 30 clicks each, independently of each other. The tuning is digressive, the oil synthetic and the spring rate is 6/5 kg/mm.

Key benefits

• True Rear: a complete strut at the rear with the spring around the damper.
• Inverted monotube on MacPherson: stiff strut in fast corners.
• 2-way: compression and rebound 30 clicks each, independent.
• Second piston in the reservoir: extra oil volume outside the damper.
• PTFE-coated steel-braided lines: robust connection to the reservoir.
• Digressive damping: tight under roll and dive.
• Camber plates on suitable kits: rubber top mounts optional.
• Spring rate 6/5 kg/mm: for the True Rear layout.

Suitable for

BMW 3 Series E46 Sedan, Coupe and Touring, model years 1998 to 2006, with rear-wheel drive, in True Rear version (BC Racing part number I-31; not for the M3 and the Convertible)

• Serious track use and club racing
• Cars with high cornering speeds and lots of grip
• Drivers who want stiffness and 2-way adjustment in one kit

Technical specifications

• Manufacturer: BC Racing
• Part number: I-31-HM
• Series: HM, inverted 2-way with external reservoir
• Version: True Rear, a complete strut at the rear with the spring around the damper
• Spring rate front/rear: 6/5 kg/mm
• Damper design: inverted monotube on MacPherson with dual piston and external reservoir, digressive
• Damping: 2-way, compression and rebound 30 clicks each, independent
• Ride height: continuously adjustable via the damper body
• Top mounts: camber plates on suitable kits, rubber top mounts optional
• Contents: 4 struts with dampers and springs, lower mounts, top mounts where applicable, adjustment spanners and warranty card with serial number
• Warranty: 1 year on manufacturing defects. With this track-focused series, noise is not covered by the warranty

Fitting and delivery

In addition to the struts at the front and the coilovers at the rear, the reservoirs must be firmly secured, with the lines routed so that they do not rub anywhere at full suspension travel and steering lock. Please note: BC Racing specifies that the body shell must be reinforced before fitting a True Rear kit. Have the kit fitted by a workshop with track experience and then have a wheel alignment done on the E46. BC Racing advises periodic greasing of 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 combines inverted front struts with 2-way reservoirs, and adds a complete strut at the rear of the E46.

Why choose this HM coilover kit E46 True Rear?

Anyone who uses an E46 hard and often on track wants a front strut that does not flex, damping that is adjustable per direction and a rear axle that can be adjusted just as freely as the front. This kit offers all three in one package.

BC Racing coilover kits for the BMW E46 Sedan, Coupe and Touring in True Rear version

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

For the standard version without True Rear, BC Racing has separate kits for the E46 Sedan, Coupe, Touring and Compact. Their part numbers start with I-02. 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 True Rear and the standard HM for the E46?

The HM coilover kit E46 True Rear (I-31) has a complete strut at the rear with the spring around the damper and 6/5 kg/mm. The standard HM (I-02) keeps the separate spring and damper at the rear and has 8/10 kg/mm.

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

On the MacPherson struts the HM has an inverted monotube, which is stiffer under high lateral load than the upright monotube of the ER. Both are 2-way with external reservoir.

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

Yes for the Touring: BC Racing releases this True Rear kit for the rear-wheel drive E46 Sedan, Coupe and Touring, except the M3. For the Convertible, BC Racing has no True Rear kit, but its own standard kit under part number I-90.

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

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

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.