XYZ Racing Pro Rally Coilovers — Mazda COSMO 13B/20B ROTARY 1990-1996

The JC-series Eunos Cosmo is a strange brief for a rally-spec coilover. A 1,500kg luxury GT with a triple-rotor 20B or twin-rotor 13B up front, wrapped around a long wheelbase and softly-sprung double wishbones, is not what most owners are throwing at a gravel stage. But the same chassis traits that made the Cosmo a soggy boulevard cruiser – lazy damper valving, weight pressing on the nose-heavy rotary, body roll that loads the outside front wheel too quickly – are exactly what the XYZ Racing Pro Rally coilover is built to overhaul.

This is the loose-surface variant of XYZ’s range, sprung and valved for the kind of high-amplitude inputs a road car never sees: kerbs, ruts, compression dips, and the constant high-frequency chatter of broken tarmac and gravel. On a Cosmo that means controlling the rotary’s forward mass without locking the chassis solid the moment the surface deteriorates.

What this coilover does for your 1990-1996 Mazda COSMO 13B/20B ROTARY

The Pro Rally damping settles the front end faster after a compression, which on a long, nose-heavy car is the single biggest gain a driver feels. Body roll is reined in without going to a road-circuit spring rate, so the Cosmo still soaks up sharp-edged bumps rather than skipping over them. Ride height is adjustable independently of spring preload, which matters on this chassis because the rear suspension travel needs protecting – drop too far and you’ll run out of bump stroke before the rotary even spools. Damping adjustment lets you trim front-end bite for the surface in front of you, and the inverted-strut layout where fitted improves the lateral stiffness the standard JC dampers were never asked to provide.

About the Pro Rally coilover

The Pro Rally is XYZ’s gravel and loose-surface specification, sat alongside the Tarmac Rally and Circuit Master in the range. Construction follows XYZ’s house pattern: a monotube damper body, separate spring and ride-height adjustment so corner-weighting doesn’t fight preload, pillow-ball upper mounts where the chassis allows, and damping adjustment on a single click-detented knob per corner. Spring rates and valving on the Pro Rally are deliberately softer than the circuit programmes – the goal is wheel control over rough ground rather than absolute roll stiffness. Materials are corrosion-treated for the British climate, and the kit is rebuildable rather than disposable, which matters on a car this age where you’re committing to a long ownership horizon.

Fitment for the Mazda COSMO 13B/20B ROTARY (1990-1996)

This kit is built specifically for the JC-series Eunos Cosmo, chassis code MA20, covering the 1990 to 1996 production run with the 13B-REW twin-rotor and 20B-REW triple-rotor engines. It is a four-corner kit covering both front struts and rear dampers. Confirm your chassis plate before ordering – the Cosmo was JDM-only and import histories vary.

What buyers also search for

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Configure your spring rates, damping preference and ride height below.