XYZ Racing Top Sport Coilovers — Infiniti Q45 (G50) Front top mount: 116mm / Front lower mount: φ20 1989-1997

The Q45’s factory suspension was tuned for boulevard comfort, not the load transfer that comes with a spirited backroad or an occasional track day – a byproduct of Infiniti chasing quiet, isolated ride quality around the VH45DE V8 up front and rear-wheel drive underneath. The XYZ Racing Top Sport coilover kit for the G50, specified here to the 116mm front top mount and φ20 front lower mount, resets that geometry with adjustable ride height and a damping curve built for cars that see both the school run and a track day.

This is a Top Sport spec, meaning the tune sits between a fast-road setup and a dedicated circuit kit: firm enough to control the Q45’s kerb weight through direction changes, but not so aggressive it turns the daily commute into a chore. For a car built around effortless V8 torque and a long wheelbase, that balance matters more than outright stiffness.

What this coilover kit does for your 1989-1997 Infiniti Q45

Fitted to the G50, the kit raises spring rate by roughly 2kg/mm over the standard street setting and increases damping by 30 to 50 percent, which is the difference between a Q45 that wallows under load and one that holds a line through a fast sweeper. The extra control shows up first under braking, where the nose-heavy V8 layout normally dives and unsettles the front axle; stiffer damping keeps the contact patch loaded instead of letting weight pitch forward unchecked. Through direction changes the same damping increase suppresses the body roll the factory tune allowed, which puts more of each front tyre’s contact patch to work and improves traction out of a corner. Ride height is adjustable independently of that damping change, so you can drop the car for a lower centre of gravity without giving up the compliance a road-going Q45 still needs over broken tarmac.

About the Top Sport coilover

XYZ Racing built the Top Sport line around lessons taken from its own track programme, translating race-day damping and spring-rate data into a kit that still works on the road. Compared with the standard street tune, Top Sport specs run around 30 to 50 percent more damping force, or roughly a 2kg/mm increase in spring rate, calibrated to absorb sharp inputs like potholes and expansion joints without transmitting the full hit into the chassis. That extra control is what keeps the shock body settled and the tyre loaded through a big compression, rather than letting the wheel skip. XYZ position the result for track days and hard road driving rather than as a full race-only tune, which is why the valving stops short of a harshness that would make a Q45 unpleasant to live with day to day. On this platform specifically, that means a kit built to control a heavier RWD saloon rather than a lightweight hot hatch, a different engineering problem the Top Sport valving is set up to handle.

Fitment for the Infiniti Q45 (1989-1997)

This kit is specified for the G50-chassis Q45 built between 1989 and 1997, matched to a front top mount of 116mm and a front lower mount of φ20. Confirm those two mounting dimensions against your car before ordering, as Q45 production spanned more than one suspension revision across the model run.

What buyers also search for

• Infiniti Q45 coilover upgrade for a heavy RWD V8 saloon
• Q45 G50 suspension setup for road and occasional track use
• Infiniti Q45 Top Sport damping for reduced front-end dive under braking
• G50 adjustable ride height coilover kit UK

Get the G50 built to the exact top mount and lower mount spec above – configure yours below.