XYZ Racing Street Advanced Coilovers — Nissan 240/260/280 Z φ51 welding 1970-1978

The 240/260/280 Z’s long bonnet hides a cast-iron straight-six sitting well ahead of the front axle, and the factory struts from the 1970s were never built to control that mass through a hard corner. XYZ Racing’s Street Advanced coilover kit for this S30-generation Z replaces that ageing geometry with a fully adjustable strut insert designed for road use with the odd trackday thrown in.

Because the original 240/260/280 Z strut housing has no built-in coilover perch, this kit uses a φ51 weld-in sleeve – a threaded collar welded directly to the strut body rather than relying on a factory ledge that was never meant to be height-adjustable. It’s the correct route for a car this old, and it gives the Street Advanced kit a solid mounting point for the 720-way damping adjustment underneath.

What this coilover does for your 1970-1978 Nissan 240/260/280 Z

Drop the ride height and firm up the front end, and the Z’s nose-heavy balance stops working against you under trail braking – the front tyres load progressively instead of diving and washing wide mid-corner. The 720-way damping adjustment lets you soften the rear for a bumpy B-road one weekend and firm both ends for a track day the next, without swapping parts. Because the strut inserts adjust height independently of spring preload, you can correct the slight nose-down stance many early Zs develop after five decades of tired factory springs and bushes, and get the semi-trailing-arm rear sitting where XYZ designed it to work.

About the Street Advanced coilover

Street Advanced is XYZ Racing’s volume model, built from years of development by the brand’s in-house engineering team and refined through use in racing programmes worldwide. It sits below the fully motorsport-focused ranges but isn’t a stripped-down entry kit – it carries 720 damping adjustment positions, giving a far finer window between comfort and control than a basic two-way or single-adjust set-up. The intent is a coilover that works as daily suspension on a rough road and still holds its composure on-track, without needing a full re-tune between the two. For a car like the S30 Z, run mostly on the road with the occasional circuit outing, that range of adjustment is the reason to choose this kit over a fixed-rate spring conversion.

Fitment for the Nissan 240/260/280 Z φ51 WELDING (1970-1978)

This kit is built for the S30-generation 240Z, 260Z and 280Z sold between 1970 and 1978, using the φ51 weld-in strut sleeve rather than a bolt-on perch. Confirm your car retains its original strut housing before ordering, since prior repairs or replacement struts can change the weld surface.

What buyers also search for

• Nissan 240Z coilover conversion for road and track
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• S30 Z ride height and camber correction for a straight-six front end
• Weld-in φ51 coilover sleeve fitment for early 240/260/280 Z struts
• Street Advanced coilover options for a classic Z built for commuting and trackdays alike

Configure your φ51 weld-in Street Advanced kit for the 240/260/280 Z below and match the damping and spring rate to how you actually use the car.