HSD Dualtech Coilovers BMW 3 Series E93 Convertible 07-13

HSD Dualtech Coilovers for BMW 3 Series E93 Convertible (07-13) – 14-Way Twin-Tube Damping, Full Height Adjustment

The HSD Dualtech kit replaces the worn or soft factory dampers on your BMW 3 Series E93 Convertible with four fully adjustable twin-tube coilovers built specifically for this car. It is HSD's road-focused range: a big step up in body control and steering response over standard suspension, while keeping a ride you can live with every day and the option of the odd track day.

The 14-way damping adjuster lets you go from a softer road setting to a firmer track setting in a few clicks. Ride height is set by screwing the damper body up or down, separately from spring preload, so you can lower the car without losing suspension travel or changing how the spring behaves.

Specifications

• Damper type: low gas-pressure twin-tube
• Damping adjustment: 14-way, soft to hard
• Spring pack: Default
• Front spring: 8kg/mm (approx. 78 N/mm), 175mm long, 65mm ID
• Rear spring: 10kg/mm (approx. 98 N/mm), 200mm long, 65mm ID
• Adjustment: Height and Damping
• HSD part number: HSD8-DT-BM13

Key Features

• 14-way adjustable twin-tube dampers with low gas pressure for a compliant road ride
• Full-length height adjustment, separate from spring preload, so you keep full damper stroke when lowered
• 6061 aluminium top mounts and spring seat collars
• Zinc-plated damper bodies with e-coated lower mounts and full-length dust boots for corrosion protection
• Designed as a bolt-on kit for this car, with spares and rebuild support through the UK distributor

What's in the Kit?

• 4 x HSD Dualtech coilovers
• 2 x C-spanners for height and preload adjustment
• 1 x set of fitting instructions
• 2 x HSD stickers

Please note: the HSD feature graphics in the gallery are illustrations of the range; the coilovers supplied are specific to this car.

Fitment

• BMW 3 Series E93 Convertible (2007-2013)
• Engines/models: 316i, 318i, 318ci, 320i, 320si, 323i, 325i, 328i, 330i, 335i, 316d, 318d, 320d, 325d, 330d, 335d

Not suitable for: The BMW E93 M3 without EDC (2007-2013) - this needs a different HSD kit.

Installation

The kit is a direct replacement for the standard dampers and springs on the BMW 3 Series E93 Convertible, using the factory mounting points with no cutting or drilling. Set an even ride height side to side using the body adjustment rather than the preload collars, tighten every lock ring, then have a full four-wheel alignment done. Check the ride height and that all bolts and lock rings are tight again after the first few hundred miles. We recommend professional fitting by a garage with spring compressors and alignment equipment.

Can I get different spring rates?

This kit comes with 8kg front and 10kg rear springs. HSD springs are available in a wide range of rates, so contact us if you need a custom set-up for track use.

Does this kit fit my car?

HSD lists this kit for the BMW 3 Series E93 Convertible (2007-2013). Not suitable for: the BMW E93 M3 without EDC (2007-2013) - this needs a different HSD kit.

Can I adjust the alignment with these coilovers?

This kit does not include camber adjustment, so use adjustable arms if you need more camber change. A four-wheel alignment is needed after fitting.

What is the difference between HSD Dualtech and MonoPro?

Dualtech uses 14-way twin-tube dampers and is aimed at road cars with occasional track use. MonoPro uses 16-way high gas-pressure monotube dampers that stay consistent when driven hard, and suits regular track days.

Can I lower the car without changing the spring preload?

Yes. HSD coilovers adjust ride height by screwing the damper body in its lower mount, separately from the spring preload collar, so you keep the same spring behaviour and damper travel.

Do I need a wheel alignment after fitting?

Yes. Changing ride height alters toe and camber, so a full four-wheel alignment is needed after fitting and after any big height change.

Are these coilovers road legal?

Yes, they are designed for road use. Lowering is a modification, so tell your insurer, and keep enough ground clearance and suspension travel for UK roads.

What warranty do HSD coilovers have?

HSD coilovers are covered by a 12-month warranty against defects in materials and workmanship. Spare parts, springs and rebuild support are available through the UK distributor.