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Q45, M and Q70

Infiniti Q45, M and Q70 Coilovers

Our Infiniti Q45, M and Q70 coilovers are for Infiniti's big flagship sedans, from the first Q45 to the last. On the older cars, BC makes different kits depending on the spindle (the part the wheel hub mounts on). On the later sedans, the kit depends on rear or all-wheel drive. Each model section starts with its BC kit where there is one.

Not sure about the spindle? Call 1-800-460-9106.

Black Infiniti M45 sedan lowered on coilovers at an art gallery entrance in the evening

Animated illustration. It shows where coilovers sit on a car, not your exact kit. Depending on the car and the kit, coilovers can lean forward or back or stand straight up, and some cars use a separate spring and shock in the rear. Your ride height depends on the kit and how it is set up.

What to check first: spindle, drive and welding

We list twenty-four kits across seven model sections. Check these points before you choose a kit.

Spindle

BC's kits for the Q45 and early M are named "With Spindle" or "Without Spindle." Ask us which one your car takes.

RWD or AWD

The M35, M37 and Q70 have their own AWD kits. Ksport also has kits for the M35X and M45X (AWD).

Welding

BC's with-spindle Y33 kit and Ksport's Y33 and F50 kits must be welded in.

BC Racing coilovers for Infiniti sedans

Twelve BC kits, second-generation Q45 and newer

BC Racing makes four series for the Infiniti Q45, M and Q70: BR, DS, ER and ZX. All twelve BC kits here come in BR and DS. Only the rear-drive Y50 M kit also comes in ER and ZX. Free shipping on BC Racing kits in the continental US.

See all BC Racing coilovers The M35 and M45 kits

Every kit comes in BR and DS, one in ER and ZX

Either BR or DS gives you a full coilover suspension. Here is how all four series differ.

BR has one knob that sets compression and rebound together, across 30 clicks.

DS works like BR but uses a digressive (firmer low-speed) piston.

ER and ZX, for the M35/M45 RWD

ER is an upright (not inverted) shock with a separate reservoir. It sets compression and rebound on their own, over 30 clicks. BC calls ZX its "most track-tested."

Two BC kit names here say "Swift Front Only." Ask us before you add springs with the Custom Build for BC Coilovers option.

Ksport, TEIN and Feal for these sedans

Three more brands make kits for these sedans. Call 1-800-460-9106 for help.

Ksport

Ksport has ten kits, covering six of the seven model sections. The M and Q70 kits use true rear coilovers, not a separate rear spring.

TEIN

TEIN has its Flex Z kit for the Y50 M sedans.

Feal

Feal has one kit, for the second-generation Q45.

Where to start with a highway car, an M45 sport sedan or a Q45 project

Q70 or M37 daily

Match the kit to AWD or RWD.

Kits to look at: BC AWD or RWD for your model, Ksport RWD with true rear coilovers

Y50 M45 sport sedan (RWD)

ER's two separate adjusters suit a sport sedan, and ZX is the series BC calls "most track-tested."

Kits to look at: BC M35/M45 RWD in ER or ZX, TEIN Flex Z, Ksport M45. For an M45x (AWD): Ksport M45X.

Y33 Q45 project

Check your spindle type, and decide if you will weld.

Kits to look at: BC with spindle (weld-in, not for Touring) or without spindle, Feal, Ksport (welding)

Every big Infiniti coilover kit we carry

Kits are listed newest first. Kit names below are shortened from the full product names.

Notes in BC kit names: "Swift Front Only" means the optional Swift spring upgrade is offered for the front springs only on that kit.

Q70 and Q70L

Codes: Y51 (Ksport)

BC Racing coilover kit for the 2014 to 2019 Infiniti Q70 — **BC Racing kit**The BC Racing coilover kit listed for the 2014 to 2019 Infiniti Q70. Photo: BC Racing.

Good to know: BC makes AWD and RWD kits; the RWD kit also fits the Q70L. Ksport's RWD kit has true rear coilovers.

M37, M56 and the M35h hybrid

Codes: Y51 (Ksport)

BC Racing coilover kit for the 2011 to 2013 Infiniti M37 — **BC Racing kit**The BC Racing coilover kit listed for the 2011 to 2013 Infiniti M37. Photo: BC Racing.

Good to know: BC makes an M37 AWD kit, an M37/M56 RWD kit and an M35h hybrid RWD kit. Ksport has separate M37 and M56 rear-drive kits that stop at 2012.

M35 and M45, rear drive or AWD (the x models)

Codes: Y50

BC Racing coilover kit for the 2006 to 2010 Infiniti M35 — **BC Racing kit**The BC Racing coilover kit listed for the 2006 to 2010 Infiniti M35. Photo: BC Racing.

Good to know: BC's rear-drive kit fits both models and comes in BR, DS, ER and ZX; its AWD kit is for the M35 only. Ksport has four kits, one for each model and drive. TEIN has its Flex Z kit.

The early M sedans

Codes: Not in the kit names

BC Racing coilover kit for the 2002 to 2004 Infiniti M35 and M45 — **BC Racing kit**The BC Racing coilover kit listed for the 2002 to 2004 Infiniti M35 and M45. Photo: BC Racing.

Good to know: There is one kit: BC's M35/M45 RWD kit, "With Spindle - Swift Front Only."

BC Racing2002-2004 M35/M45 RWD (With Spindle, Swift Front Only)Series: BR, DSSee price and details

The last Q45

Codes: F50 (Ksport)

BC Racing coilover kit for the 2002 to 2006 Infiniti Q45 — **BC Racing kit**The BC Racing coilover kit listed for the 2002 to 2006 Infiniti Q45. Photo: BC Racing.

Good to know: BC's RWD kit is "With Front Spindle - Swift Front Only." Ksport's F50 kit says "Welding Required."

Q45, second generation

Codes: Y33 (Ksport)

BC Racing coilover kit for the 1997 to 2001 Infiniti Q45 — **BC Racing kit**The BC Racing coilover kit listed for the 1997 to 2001 Infiniti Q45. Photo: BC Racing.

Good to know: BC kits depend on the spindle: one kit is "With Spindle - Weld-In - Excl. Touring," and two are without spindle. Ksport's kit says "Welding Required." Feal has one kit.

The original Q45, from 1990

Codes: G50

Good to know: There is one kit, from Ksport, named "With 116mm Top Mount & 20mm ID Front Lower Mount." We have no BC kit for this car.

Ksport1990-1993 Q45 (G50), With 116mm Top Mount & 20mm ID Front Lower MountSee price and details

Seven Infiniti model sections at a glance

Model	Years	What decides the kit	BC Racing series
Q70	2013 to 2019	AWD or RWD (BC)	BR, DS
M37, M56, M35h	2011 to 2013	AWD, RWD or hybrid (BC); model (Ksport)	BR, DS
M35 and M45	2006 to 2010	RWD or AWD (BC, Ksport)	BR, DS, ER, ZX
Early M35/M45	2002 to 2004	BC only	BR, DS
Q45 F50	2002 to 2006	Your choice of brand	BR, DS
Q45 Y33	1997 to 2001	Spindle or not (BC); welding (BC with spindle, Ksport)	BR, DS
Q45 G50	1990 to 1996	Ksport only	No BC kit

Before you buy: what Q45 and M owners run into

What Q45 and M owners report most often, from owner forums, recalls and service bulletins, and what each point means for your coilover suspension.

Q45a hydraulic active suspension

First gen Q45 with active suspension (Q45a), 1991 to 1995

The Q45a's hydraulic active suspension is known for leaks, worn pumps and actuators, and sagging. Many surviving cars have been converted to springs and struts. On NICOclub, owners say the hardest parts are looping the pump and bleeding the pressure. A Q45a needs that conversion before Q45 coilovers go in.

Before you install: Confirm whether your car is a Q45a or a Q45 with conventional suspension before ordering, and call us if it still has the active system.

Front camber and rear toe after lowering

Y51 M37, M56 and Q70, 2011 to 2019

On NICOclub, one M owner who went more than two inches lower on coilovers found everything in spec except front camber, at close to minus two degrees. Another added an adjustable rear toe arm and front camber arm, and says the front arm gained less than a degree. A big drop can push front camber past what the factory adjustment can correct.

Before you install: Keep the drop moderate to avoid extra arms. If you go low, plan an alignment with adjustable rear toe arms on hand.

Infiniti history

Infiniti started out with the Q45

Infiniti writes that in 1989, "INFINITI launches with 51 dealers in the United States."

1989

Two models"The convention-defying Q45 sedan and the performance-oriented M30 coupe."
Logo

On the Q45"The INFINITI logo debuted on Q45."

That first Q45 is the G50 in our kit list above. The M sedans and the Q70 came later.

Spindles, Touring models and AWD

What does "With Spindle" mean on the BC Q45 kits?

It is BC's own wording. On the second-generation Q45, BC sells a "With Spindle - Weld-In" kit and kits without a spindle. Call us and we will tell you which one your car needs.

Is there a Q45 Touring kit?

BC's with-spindle Y33 kit says "Excl. Touring." Ask us about the without-spindle kits for a Touring.

How many BC series does each kit come in?

Most come in two, BR and DS. The rear-drive Y50 M kit comes in four, adding ER and ZX.

Do the AWD M and Q70 cars have their own kits?

Most do. BC has M35 AWD, M37 AWD and Q70 AWD kits, and Ksport has the M35X and M45X. None of the kits here is listed for an M56 AWD, so call us.

Can I fit coilovers to an M35h hybrid?

Yes. BC lists a rear-drive M35h kit for 2012 and 2013, in BR and DS.

What is the warranty on BC Infiniti kits?

BC Racing North America currently lists a two-year limited warranty on full kit orders, subject to its warranty terms. TEIN, Feal and Ksport publish their own.

Infiniti sport sedans and guides

Coilover Kits by CarEvery car page we have. AWD, RWD or FWD: Why Drivetrain Changes the Coilover Kit You OrderWhy the drivetrain changes which kit fits your Q45. Comfort and Stance on a Daily Driver: Setting Up Coilovers for BothA comfortable drop on a Q45 you drive every day. How to Set Ride Height on CoiloversMeasure and set the drop on your Q45. After You Lower It: Alignment Timing, Driver-Assist Calibration and Headlight AimAlignment, driver-assist and headlight checks once the Q45 is lower. Infiniti G35Infiniti's sport sedan and coupe. Infiniti Q50The newer sport sedan. Adjustable vs. non-adjustable coiloversHow to choose the adjustment you need. How to install coiloversThe install, step by step. BC Racing for InfinitiAll of BC's Infiniti kits.

Give us the model, drive and spindle, and we will pick the kit with you

Phones are open weekdays, 9 AM to 5 PM Eastern.

Call 1-800-460-9106