XYZ Racing Racing Spec Coilovers — Opel KADETT C 1973-1979

The OP04 Kadett C’s live rear axle is the first problem any serious suspension builder faces. Get the damping wrong at the back and the car will push wide in slow corners and come unstuck mid-fast, regardless of what the front end is doing. In period, the Kadett C GT/E demonstrated what the platform was capable of with factory-spec suspension engineering behind it; fifty years on, that same bodyshell continues as a competitive tool in historic and club circuit events precisely because it responds so directly to damper calibration.

The XYZ Racing Racing Spec coilover for the 1973-1979 Opel Kadett C delivers that calibration from a competition starting point rather than a road-derived one. Every setting has been developed through active involvement in track racing, including WTCC events, which puts the baseline valving maps in a different category from anything built by road-car approximation.

What this coilover does for your 1973-1979 Opel Kadett C

On a live-axle platform like the OP04, the rear damper controls how the axle loads and unloads through direction changes – it is, in effect, managing geometry that shifts dynamically in a way a modern independent rear suspension does not. The Racing Spec’s competition-derived calibration holds the rear axle in a consistent relationship with the chassis under braking and rotation, which on a car with the Kadett C’s low mass makes the difference between a predictable trail-brake entry and one that demands a correction. At the front, the adjustable ride height allows the MacPherson geometry to be set for the reduced spring length and lowered centre of gravity a circuit build demands, rather than left at road-car compromises that blunt turn-in response and create mid-corner understeer the standard hardware was never intended to handle.

About the Racing Spec coilover

XYZ Racing’s Racing Spec is the company’s full-competition damper, designed from the outset for track racing rather than adapted from a road-biased platform. The calibration across the range has been developed through direct participation in circuit racing events, including WTCC competition – the settings are the product of race-weekend data rather than simulation or road-test estimates. For Kadett C builds carrying significant mechanical upgrades beyond standard specification – engine work, braking packages, or chassis modifications associated with A-class competition or historically modified classes – XYZ Racing offers a custom shock absorber build path. Provide a complete specification of the upgraded components and the circuits intended, and the engineering team will produce a damper mapped specifically to that package. This matters on a platform as varied in its current competition form as the OP04: a mildly prepared historic-class car and a full-spec hillclimb Kadett C require fundamentally different damper characteristics to work properly.

Fitment for the Opel Kadett C (1973-1979)

This kit covers the Opel Kadett C, chassis designation OP04, across the full production run from 1973 through 1979. For cars carrying modifications beyond standard specification, confirm the full hardware list before ordering – the custom build path described above exists specifically for builds where a standard-fitment damper would be the wrong starting point.

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For custom-mapped specifications, include your full upgraded hardware list and intended circuits when you configure yours below.