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Description

BMW E90/E92 3 Series Sedan/Coupe RWD (05-11) BC Racing ER coilover kit 7/10 kg/mm

The BC Racing ER coilover kit E90 E92 (part number I-03-ER) 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 ER series is the BC Racing coilover kit for serious track and competition use. Each damper is a monotube with a twin piston and an external reservoir, and you set compression and rebound independently of each other, each in 30 clicks.

With 7 kg/mm front and 10 kg/mm rear, this kit for the E90 and E92 is sprung stiffer than the BR and DS. The digressive piston and fully synthetic oil with a very high viscosity index keep the damping stable, even when the dampers are properly warm after a few sessions.

Key benefits

• 2-way adjustable: compression and rebound independently of each other, each in 30 clicks.
• External reservoir: monotube with twin piston and a separate oil reservoir.
• Digressive piston: firm damping during slow body movements.
• Fully synthetic oil: very high viscosity index, so the damping stays stable when things get hot.
• Spring rate 7/10 kg/mm: stiffer than the BR and DS kits for the E90 and E92.
• Camber plates: on suitable kits, rubber top mounts optional.
• Concave lock ring: holds the set height.
• Rebuildable: the dampers can be rebuilt.

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 and club racing
• Drivers who want to tune compression and rebound separately
• E90 and E92 with a track-focused build

Technical specifications

• Manufacturer: BC Racing
• Part number: I-03-ER
• Series: ER, for serious track and competition use
• Spring rate front/rear: 7/10 kg/mm
• Damper design: monotube with twin piston and external reservoir, digressive, fully synthetic oil with a very high viscosity index
• 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 on suitable kits, 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 ER kit replaces the original dampers and springs and is made specifically for this BMW. We recommend having it fitted by an experienced mechanic. After setting the ride height, a wheel alignment is required, especially if you use camber plates. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing has no stock, you can still order and we will let you know when the kit arrives.

The BC Racing I-03-ER is a 2-way adjustable coilover kit with external reservoir for the BMW E90 and E92 with rear-wheel drive, with 7 kg/mm front and 10 kg/mm rear.

Why choose this ER coilover kit E90 E92?

With 2-way adjustment you tune compression and rebound independently of each other, which gives more setup range in serious track use than a kit with combined adjustment. The external reservoir, the digressive piston and the synthetic oil make the ER suitable for an E90 or E92 that is regularly driven hard on track. After intensive use, you simply have the dampers rebuilt.

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.

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 ER and ZX coilover kit for the BMW E90 and E92?

The ER is 2-way adjustable (compression and rebound, 30 clicks each), the ZX 3-way (20 clicks of low-speed compression, 12 clicks of high-speed compression and 30 clicks of rebound). Both have an external reservoir and a digressive piston. For the E90 and E92, the ER has 7/10 kg/mm, the ZX 10/12 or 5.5/8 kg/mm.

What does 2-way adjustable mean on the BC Racing ER coilover kit for the E90 and E92?

It means that you set compression and rebound independently of each other, each in 30 clicks. On the BR and DS you adjust both together with a single adjuster. That way you tune the ER coilover kit E90 E92 more precisely to the circuit and your driving style.

Does the BC Racing ER coilover kit fit every BMW E90 and E92?

No. The kit is released for the E90 Sedan and E92 Coupe with rear-wheel drive, excluding the M3 and the xDrive (xi) with four-wheel drive. If you have an E91 Touring or E93 Convertible, choose one of the separate BC Racing kits with an I-17 number.

What is the delivery time of the BC Racing ER coilover kit for the BMW E90 and E92?

The ER is available within 1 to 2 weeks as long as the manufacturer has stock. If it is temporarily out of stock, you can still order and we will tell you the expected 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.