XYZ Racing Drag Racing Coilovers — Maserati BITURBO SI φ52 welding (PCD: 4X98) 1986-1991

Launch a rear-driven Biturbo SI off the line and the factory dampers let the nose lift and the back end squat unevenly before the twin-turbo V6’s boost ever loads the tyres. XYZ Racing’s Drag Racing coilover for the Maserati Biturbo SI φ52 Welding (PCD: 4X98) is built to control that weight transfer on the 1986-1991 chassis, not soften it away.

This is a straight-line setup, not a road or track compromise: it is tuned to plant power through a quarter-mile pass, holding the rear axle down long enough for the compressor to spool and the tyres to bite. For a low-volume Italian turbo coupe most people have written off as a garage project, that is the difference between a car that wheelspins its way to a slow 60-foot and one that hooks up.

What this coilover does for your 1986-1991 Maserati Biturbo SI φ52 Welding (PCD: 4X98)

On the 1986-1991 Biturbo SI, this kit lets you shift static weight bias toward the driven rear axle to suit how the transmission puts power down, rather than leaving the car on a compromise front/rear setting meant for road use. That extra loading forces the rear tyres into greater contact-patch compression the instant the clutch drops, cutting the idle spin that otherwise burns off boost and 60-foot time. Because the geometry keeps the rear planted through the full pull, the twin-turbo V6 stays hooked up as it comes on boost instead of breaking traction mid-pass. The result is a Biturbo that launches flatter and tracks straighter at speed, which matters on a chassis with this little modern suspension development behind it.

About the Drag Racing coilover

XYZ Racing built the Drag Racing range specifically around the 0-400 metre pass rather than lap times or ride comfort. The coilover’s setup lets you bias front and rear ride height and preload to match how a given drivetrain – front-wheel, rear-wheel or four-wheel drive – actually puts power to the road, which is why the same platform underpins everything from front-drive hatchbacks to a rear-driven Biturbo. Shifting more load onto the driven axle forces the tyre into a harder compression at the moment of launch, shortening the window where the wheel is spinning rather than gripping. That translates directly into a cleaner 60-foot and less boost wasted through wheelspin before the turbos are fully lit. Higher up the run, the same geometry keeps the car settled rather than floaty, which is what the vendor spec calls improved stability at speed. It is a single-purpose kit built for launch and straight-line control, not for cornering compliance.

Fitment for the Maserati BITURBO SI φ52 WELDING (PCD: 4X98) (1986-1991)

This kit is built to the Biturbo SI’s φ52 Welding front strut mount and 4×98 PCD, covering the 1986 to 1991 production run under chassis code MS03. Confirm your car matches this exact welding and PCD specification before ordering, as Biturbo variants changed hardware across the model’s run.

What buyers also search for

• Maserati Biturbo SI drag racing coilovers for 0-400 metre launches.
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• Biturbo SI φ52 Welding PCD 4X98 coilover kit for quarter-mile passes.
• Maserati Biturbo rear-wheel-drive weight transfer tuning for drag events.

Every Drag Racing coilover for the Biturbo SI is built to this exact chassis spec – pick your setup below to configure yours.