Shop

Description

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

The BC Racing ZX coilover kit E46 True Rear (part number I-31-ZX) 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 3-way adjustable kit has a complete strut on the rear axle. The ZX combines DS and ER technology and is made for competitive track work, long sessions and demanding drifting.

True Rear means that the original rear layout of the E46, with a separate spring and a separate damper, is replaced by a coilover with the spring around the damper. This way you also set the rear height on the damper body. The standard ZX without True Rear (I-02) keeps the separate spring and damper at the rear.

The dampers are upright monotubes with dual piston and an external reservoir. You adjust low-speed compression in 20 clicks, high-speed compression in 12 clicks and rebound in 30 clicks, each separately. The tuning is digressive, the oil is racing oil with an ultra-high viscosity index and the spring rate is 6/5 kg/mm.

Key benefits

• Complete strut at the rear: no more separate spring, but full adjustability.
• 3-way damping: 20 clicks slow compression, 12 clicks fast compression, 30 clicks rebound.
• External reservoirs: extra oil volume for long sessions.
• Dual piston: more control within the damper.
• Racing oil: ultra-high viscosity index for heavy loads.
• Replaceable upper mounting: with camber plates on suitable kits.
• Continuously adjustable ride height: via the damper body, front and rear.
• 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)

• Competitive track work
• Long sessions and endurance-style track days
• Demanding drifting

Technical specifications

• Manufacturer: BC Racing
• Part number: I-31-ZX
• Series: ZX, 3-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: upright monotube with dual piston and external reservoir, digressive
• Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression, 30 clicks rebound
• Ride height: continuously adjustable via the damper body
• Top mounts: replaceable upper mounting, 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

Fitting covers the struts at the front, the coilovers at the rear and secure mounting of the reservoirs, with lines that do not touch anything at full suspension travel. Please note: BC Racing specifies that the body shell must be reinforced before fitting a True Rear kit. A workshop with experience in track suspension is recommended, and after setting the ride height the E46 should have a wheel alignment. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If it is out of stock, you can still order and we will keep you informed.

Three adjustments per damper and a complete strut at the rear: with the ZX you set up an E46 like a race car.

Why choose this ZX coilover kit E46 True Rear?

For anyone who has already explored the limits of a 2-way kit, the ZX offers the next step: slow and fast compression separately, with reservoirs that can handle long sessions. Thanks to the True Rear layout, you do not have to make any compromises in the rear setup.

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 ZX True Rear and the standard ZX for the E46?

The ZX 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 ZX (I-02) keeps the separate spring and damper at the rear and has 5.5/8 kg/mm.

What is the difference between the BC Racing ZX and ZR for the E46 True Rear?

The ZX has upright dampers; the ZR uses an inverted monotube on MacPherson struts and lets you mount the reservoir on the chassis or on the damper body. Both are 3-way with the same click distribution.

Does this BC Racing ZX 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 ZX coilover kit?

The delivery time is normally 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.