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Description

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

The BC Racing ER coilover kit E46 (part number I-02-ER) 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 10 kg/mm front and 10 kg/mm rear.

It is BC Racing’s 2-way adjustable reservoir kit, intended for serious track and competition use, where you want to tune compression and rebound separately from each other instead of with one knob.

Each damper is a dual-piston monotube with an external reservoir. Compression and rebound each have their own adjuster with 30 clicks. This lets you control separately how quickly the E46 compresses under braking and turn-in, and how quickly it comes back after a bump or kerb.

At 10/10 kg/mm, this is a firmly tuned kit. The dampers have a digressive characteristic and are filled with fully synthetic oil with an ultra-high viscosity index.

Key benefits

• 2-way adjustable: compression and rebound 30 clicks each, completely separate from each other.
• External reservoir: more oil, so consistent damping during long sessions.
• Dual piston: monotube construction that goes with the reservoir.
• Digressive: firm control over body roll, compliant during fast wheel movements.
• Synthetic oil with ultra-high VI: little difference between cold and warm dampers.
• Concave lock ring: BC Racing’s lock ring design.
• Camber plates: rubber top mounts and a check valve are optional.
• Spring rate 10/10 kg/mm: firm for track and competition use.
• Rebuildable: can be rebuilt as new after a season.

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 use and club competitions
• Time attack and long track day sessions
• Drivers who want to set compression and rebound separately

Technical specifications

• Manufacturer: BC Racing
• Part number: I-02-ER
• Series: ER, 2-way with external reservoir
• Spring rate front/rear: 10/10 kg/mm
• Damper design: dual-piston monotube with external reservoir, 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 from track-focused series is not covered by the warranty

Fitting and delivery

The kit replaces the original dampers and springs front and rear. When fitting, decide where the reservoirs will go and make sure the lines stay clear during suspension compression and steering. Have the E46 aligned after setting the height. 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.

One knob for compression and another for rebound: that is how you solve dive under braking on an E46 without the car bouncing over the kerbs.

Why choose this ER coilover kit E46?

Because with a 2-way kit you can really tune instead of making compromises. You make the compression firmer for less weight transfer and set the rebound so that the tyres stay in contact. The reservoir ensures that this feel is still right on the last lap of a session.

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 ER and ZX for the E46?

The ER coilover kit E46 is 2-way adjustable with 30 clicks of compression and 30 clicks of rebound; the ZX is 3-way and splits compression into low and high speed. Both have an external reservoir and a dual piston.

What does 2-way adjustable mean for the BC Racing ER coilover kit for the E46?

2-way adjustable means that compression (bump) and rebound each have their own adjuster. With a 1-way kit such as the BR or DS, you adjust the two together with one knob.

Is the BC Racing ER coilover kit with 10/10 kg/mm not too stiff for the road in an E46?

No, the kit can be driven on the road, but you will clearly notice that the emphasis is on the track. The ER is made for serious track use.

Does this BC Racing ER 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 ER coilover kit?

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