Shop

Description

BMW E90/E92 3 Series Sedan/Coupe RWD (05-11) BC Racing ZX coilover kit 5.5/8 or 10/12 kg/mm

The BC Racing ZX coilover kit E90 E92 (part number I-03-ZX) 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. You choose the spring rate when ordering: 5.5/8 or 10/12 kg/mm front/rear.

The ZX series from BC Racing combines the DS with the external reservoir of the ER and is made for competitive track work, long sessions and demanding drifting. Each damper is an upright monotube with a twin piston and an external reservoir.

The 3-way adjustment gives you 20 clicks for low-speed compression, 12 clicks for high-speed compression and 30 clicks for rebound. For the E90 and E92, BC Racing supplies the ZX with two spring rates: 5.5 kg/mm front and 8 kg/mm rear, the same spring rate as the BR and DS kits for this car, or stiff springs of 10 kg/mm front and 12 kg/mm rear.

Key benefits

• 3-way adjustable: 20 clicks of low-speed compression, 12 clicks of high-speed compression and 30 clicks of rebound.
• External reservoir: upright monotube with twin piston.
• Digressive piston: firm damping during slow body movements.
• Racing oil with a very high viscosity index: consistent damping in long sessions.
• Spring rate of your choice: 5.5/8 kg/mm, the same as the BR and DS, or 10/12 kg/mm, stiffly sprung for track and drift.
• Replaceable upper mount: with camber plates on suitable kits, rubber top mounts optional.
• DS and ER in one: the damper basis of the DS with the reservoir of the ER.
• 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).

• Competitive track work and long sessions
• Demanding drifting with the E90 or E92
• Drivers who want to tune low-speed and high-speed compression separately, with the springs of the BR and DS (5.5/8) or with stiffer springs (10/12)

Technical specifications

• Manufacturer: BC Racing
• Part number: I-03-ZX
• Series: ZX, for competitive track work, long sessions and drifting
• Spring rate front/rear: 5.5/8 or 10/12 kg/mm (choose when ordering)
• Damper design: upright monotube with twin piston and external reservoir, digressive, racing oil with a very high viscosity index
• Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression, 30 clicks rebound
• Ride height: infinitely adjustable via the damper body
• Top mounts: replaceable upper mount, 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 kit is vehicle-specific and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic. After setting ride height and camber, 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 I-03-ZX for the BMW E90 and E92 is a 3-way adjustable coilover kit with external reservoir, available with springs of 5.5 kg/mm front and 8 kg/mm rear or of 10 kg/mm front and 12 kg/mm rear.

Why choose this ZX coilover kit E90 E92?

If you do long track sessions or drift seriously with your E90 or E92, you benefit from separate adjustment of low-speed and high-speed compression. The ZX gives you those three adjustment options, with an external reservoir and racing oil that keeps the damping consistent. Not every E90 or E92 running 3-way damping needs stiff competition springs: with 5.5/8 kg/mm you keep the spring rate of the BR and DS and fine-tune the damping without springing the car any stiffer. The stiff 10/12 kg/mm springs suit a car that is mainly driven on the circuit or the drift track.

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 ZX with 5.5/8 and with 10/12 kg/mm for the BMW E90 and E92?

The difference is in the spring rate: 5.5 kg/mm front and 8 kg/mm rear versus 10 kg/mm front and 12 kg/mm rear. Both versions have the same BC Racing part number (I-03-ZX), 3-way dampers with external reservoir and the same price. With the ZX coilover kit E90 E92, choose 5.5/8 kg/mm if you want a less stiffly sprung car with the springs of the BR and DS, and 10/12 kg/mm for a more stiffly set up car that is mainly driven on the circuit or drift track.

What is the difference between the BC Racing ZX and ER coilover kit for the E90 and E92?

The ZX is 3-way adjustable, the ER 2-way. On the ZX you set low-speed and high-speed compression separately (20 and 12 clicks) alongside 30 clicks of rebound; the ER has 30 clicks for compression and 30 for rebound. Both have an external reservoir and a digressive piston.

Does the BC Racing ZX coilover kit fit a BMW E92 M3 or E90 xDrive?

No. This ZX kit is released for the E90 Sedan and E92 Coupe with rear-wheel drive, without the M3 and without the xDrive (xi) with four-wheel drive. For the E91 Touring and E93 Convertible, BC Racing has its own kits with an I-17 number.

How long is the delivery time of the BC Racing ZX coilover kit for the BMW E90 and E92?

1 to 2 weeks, as long as the manufacturer has stock. If the kit is temporarily out of stock, you can still order and we will keep you informed of 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.