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Description

BMW E91/E93 3 Series Touring/Convertible RWD (05-11) BC Racing DS coilover kit 5.5/10 kg/mm

The BC Racing DS coilover kit E91 E93 (part number I-17-DS-DA) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E91 Touring and E93 Convertible with rear-wheel drive, excluding the M3, model years 2005 to 2011. The spring rate is 5.5 kg/mm front and 10 kg/mm rear.

The DS series is BC Racing’s track-focused coilover kit. For the E91 Touring and E93 Convertible, that means the same springs as the BR, but a monotube damper with a digressive piston that damps more firmly at slow body movements (0 to 50 mm/s).

As a result, the car stays calmer when turning in, braking and rolling, which you notice on a track day and when driving sportily on the road. You set the ride height independently of the spring preload and adjust the damping in 30 clicks.

Key benefits

• Digressive piston: firmer damping at slow movements between 0 and 50 mm/s.
• 30-click adjustment: compression and rebound together, per damper.
• Height independent of spring preload: lowering without changing the preload of the springs.
• Spring rate 5.5/10 kg/mm: the same as the BR kit for the E91 and E93.
• Pillowball top mounts or camber plates at the front: with rubber or the original mounting at the rear.
• Satin chrome damper body: the recognisable finish of the DS series.
• Concave lower lock ring: locks the set height.
• Rebuildable: the dampers can be rebuilt.

Suitable for

BMW 3 Series E91 Touring and E93 Convertible with rear-wheel drive, model years 2005 to 2011; not for the M3, the four-wheel-drive xDrive versions, the E90 Sedan and the E92 Coupe

• Regular track days with an E91 or E93
• Sporty road use with track-focused damping
• A Touring or Convertible that needs to turn in more calmly

Technical specifications

• Manufacturer: BC Racing
• Part number: I-17-DS-DA
• Series: DS, track-focused
• Spring rate front/rear: 5.5/10 kg/mm
• Damper design: monotube with digressive piston, satin chrome damper body
• Damping: 30 clicks, compression and rebound simultaneously
• Ride height: adjustable via the damper body, independent of the spring preload
• Top mounts: pillowball top mounts or camber plates at the front, rubber or original mounting at the rear
• 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

This coilover kit is specific to the E91 and E93 and replaces the original dampers and springs. We recommend having it installed by an experienced mechanic. On some cars the pillowball top mount at the front requires a small modification to the upper mounting; if in doubt, contact us. After adjusting the height, a new wheel alignment is required. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out at the manufacturer, you can still order and we will let you know when it arrives.

The BC Racing I-17-DS-DA is the DS coilover kit for the rear-wheel-drive BMW E91 Touring and E93 Convertible, with a digressive monotube damper and 5.5/10 kg/mm springs.

Why choose this DS coilover kit E91 E93?

Choose the DS if your E91 or E93 sees more track days than an average road car. The digressive piston keeps the body calm during quick changes of direction, while the springs are the same as those of the BR. That way you get more control without a stiffer spring, and with 30 clicks you tune the damping for each drive or each circuit.

BC Racing coilover kits for the BMW E91 Touring and E93 Convertible

Overview of the BC Racing series for the BMW E91 Touring and E93 Convertible supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.

For the BMW E90 Sedan and E92 Coupe, BC Racing has separate kits. Their part numbers start with I-03.

Frequently asked questions

What is the difference between the BC Racing DS and BR coilover kits for the BMW E91 and E93?

The difference is in the piston: the DS has a digressive piston and damps more firmly at slow movements, the BR a linear one. The springs are 5.5/10 kg/mm on both. The DS coilover kit E91 E93 suits those who go on track more often, the BR mainly road use.

Is the BC Racing DS coilover kit I-17 suitable for every BMW E91 Touring and E93 Convertible?

No, only for the rear-wheel-drive E91 and E93 from 2005 to 2011, excluding the M3. Four-wheel-drive xDrive versions are not in BC Racing’s application list, and for the E90 Sedan and E92 Coupe there are separate I-03 kits.

Is noise from the BC Racing DS coilover kit on an E91 or E93 covered by the warranty?

No, noise from track use is not covered by the warranty. The DS has a 1 year warranty on manufacturing defects.

How quickly is the BC Racing DS coilover kit for the E91 and E93 delivered?

Within 1 to 2 weeks as long as the manufacturer has stock. If BC Racing does not have the kit in stock, you can still order and we will let you know 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.