XYZ Racing Top Sport Coilovers — Infiniti Q45 (F50) CIMA welding 2001-2008

The Q45 F50 – badged Cima on its home market – carries its V8 up front over a chassis Nissan tuned for boulevard comfort rather than lateral grip, and that shows up as body roll and a soft, wallowy transition the moment you ask it to change direction with any real pace. XYZ Racing’s Top Sport coilover kit exists to correct exactly that, without turning a heavy luxury saloon into something unliveable on a UK B-road.

This is the spec for owners who want to run an occasional track day but still commute in the Q45 the rest of the week. Damping and spring rates sit meaningfully firmer than the factory setup without tipping into the harshness of a full race kit, so the car stays composed under load without beating you up on the motorway home.

What this coilover does for your 2001-2008 Infiniti Q45 (F50)

Winding the damping up by roughly 30-50% over the standard Cima setting, plus around 2kg/mm more spring rate than a street-biased kit, pulls the nose down under braking and keeps the outside contact patch loaded through a fast corner instead of letting the tyre unload over mid-corner bumps. You feel the difference most on direction changes – the Q45’s mass stops rolling into a corner and starts settling, so the front tyres bite earlier and the rear stays where you pointed it. Ride height is adjustable, so you can drop the car for a lower centre of gravity on track days and wind it back up for daily ground clearance. Broken tarmac and speed humps still get absorbed rather than transmitted straight into the cabin, so the extra control doesn’t cost you comfort on the commute.

About the Top Sport coilover

The Top Sport kit is built around a damping and spring-rate uplift XYZ Racing developed out of its own Top Sport racing programme – roughly 30 to 50% more damping force, or an additional 2kg/mm of spring rate, over a comfort-biased street kit. That extra control is aimed at absorbing the impact of poor road surfaces and hard compressions without the shock body kicking back or the tyre skipping off line, so contact patch and traction hold up when the going gets rough. That’s the balance XYZ Racing calls its Top Sport tune: firm enough to keep a heavy saloon settled and predictable through a fast corner, but still resolved enough to shrug off the mid-corner bumps that unsettle a softer setup. It’s built for owners doing occasional track days and hard driving on demanding roads, rather than a full-time circuit car.

Fitment for the Infiniti Q45 (F50) CIMA WELDING (2001-2008)

This kit is specced to the F50-chassis Q45, sold in Japan as the Cima, covering the 2001 to 2008 model years. Confirm your car matches the F50 chassis code before ordering, since export and JDM-market variants ran across that span.

What buyers also search for

• Infiniti Q45 F50 suspension upgrade for road and track use
• Infiniti Q45 Cima coilover kit for a heavy V8 saloon that still needs to handle
• Q45 F50 Top Sport damping that holds composure over UK road surfaces
• Infiniti Q45 (F50) adjustable ride height coilovers for daily driving and occasional track days
• Infiniti Q45 Cima 2001-2008 coilover options for owners wanting more than factory comfort tuning

Pick your damping and spring-rate spec for the Q45 F50 below and configure the kit to match how much track time you’re actually planning to do.