2009 Infiniti FX50 Road Test Specs | Edmunds

2009 Infiniti FX50 - Road Test Specs

2009 Infiniti FX50 SUV

(5.0L V8 AWD 7-speed Automatic)


Model year2009
Style4dr SUV (5.0L 8cyl 7A)
Base MSRP$54,000 est.
Options on test vehicleTechnology Package (includes lane departure warning [LDW] system, lane departure prevention [LDP] system, intelligent cruise control [full-speed range], front pre-crash seatbelts, distance control assist [DCA], intelligent brake assist [IBA] and rain-sensing front wipers)
As-tested MSRP$56,000 est.


Drive typeAll-wheel drive
Engine type90-degree V8
Displacement (cc/cu-in)5,026 (306.7)
Block/head materialAluminum/aluminum
ValvetrainDOHC 4 valves per cylinder, variable valve timing
Compression ratio (x:1)10.9:1
Redline (rpm)6,800
Horsepower (hp @ rpm)390 @ 6,500
Torque (lb-ft @ rpm)369 @ 4,400
Transmission type7-speed automatic
Transmission and axle ratios (x:1)I = 4.887, II = 3.170, III = 2.027, IV = 1.412, V = 1.000, VI = 0.862, VII = 0.775, R = 4.041, FD = 3.538


Suspension, frontIndependent, double wishbones, coil springs and stabilizer bar
Suspension, rearIndependent, multilink, coil springs and stabilizer bar
Steering typeSpeed-sensitive, hydraulic-assist rack-and-pinion power steering
Steering ratio (x:1)16.1:1
Tire brandBridgestone
Tire modelDueler H/L
Tire typeAll-season
Tire size, front265/45R21 104V
Tire size, rear265/45R21 104V
Wheel size21 by 9.5 front -- 21 by 9.5 rear
Wheel materialCast aluminum
Brakes, front14.0-inch vented disc, 4-piston sliding caliper
Brakes, rear13.8-inch vented disc, 2-piston sliding caliper

Track Test Results

0-45 mph (sec.)3.6
0-60 mph (sec.)5.6
0-75 mph (sec.)7.9
1/4-mile (sec. @ mph)13.7 @ 102.9
0-60 with 1 foot of rollout (sec.)5.3
Braking, 30-0 mph (ft.)30
60-0 mph (ft.)117
Slalom, 6 x 100 ft. (mph)63.3
Skid pad, 200-ft. diameter (lateral g)0.85
Sound level @ idle (dB)49.4
@ Full throttle (dB)74.4
@ 70 mph cruise (dB)69.9

Test Driver Ratings & Comments

Acceleration commentsThe FX50 doesn't like brake and gas at the same time, so brake torquing didn't work well. The tachometer is a little slow, so manual shifting didn't work. After matting the gas pedal and firewall in Drive, I could really feel the cams change phase at about 4,000 rpm. Gearshifts are really quick and with seven to choose from, it never falls out of the power.
Braking ratingVery Good
Braking commentsPretty firm pedal and moderate dive, but belts cinch up with each ABS stop. Remarkably short distance considering the monstrous rolling stock and 4,500-plus-pound mass. Side note: Pretty noticeable brake fade by the third quarter-mile run.
Handling ratingExcellent
Handling commentsOn the skid pad, the fore/aft/left/right power shuffle is evident. There's a lot going on under the floor, and modulating the throttle starts to get the FX50 out of shape. Still, there's a bunch of grip and the steering loads up nicely. Because VDC shuts all the way off, the slalom was also a bit of a mystery ride with unintuitive (slightly delayed) behavior from the AWD system. It feels great up to about 8/10ths, but physics take over from there. On/off throttle does provide some ability to rotate the FX50 and the steering remains quick and talkative. Eventually, the rear steps out and oversteer becomes the limiting factor -- which is highly unusual for an AWD vehicle.

Testing Conditions

Elevation (ft.)1121
Temperature (°F)86.1
Wind (mph, direction)1.5

Fuel Consumption

EPA fuel economy (mpg)14 city/20 highway
Edmunds observed (mpg)14.3 average (best = 16, worst = 13)
Fuel tank capacity (U.S. gal.)23.8

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)4,575
Curb weight, as tested (lbs.)4,575
Weight distribution, as tested, f/r (%)54/46
Length (in.)191.3
Width (in.)75.9
Height (in.)66.1
Wheelbase (in.)113.6
Track, front (in.)64.4
Track, rear (in.)64.6
Turning circle (ft.)36.7
Legroom, front (in.)44.7
Legroom, rear (in.)34.6
Headroom, front (in.)39.3
Headroom, rear (in.)38.5
Shoulder room, front (in.)57.3
Shoulder room, rear (in.)57.4
Seating capacity5
Cargo volume (cu-ft)24.8
Max. cargo volume, seats folded (cu-ft)62.0


Bumper-to-bumper4 years/60,000 miles
Powertrain6 years/70,000 miles
Corrosion7 years/Unlimited miles
Roadside assistance4 years/60,000 miles
Free scheduled maintenanceNot Available


Front airbagsStandard dual front
Side airbagsStandard front
Head airbagsStandard front and rear
Knee airbagsNot Available
Antilock brakesStandard
Electronic brake enhancementsBrake assist, electronic brakeforce distribution, automatic collision-avoidance brake application, lane-departure-prevention
Traction controlStandard
Stability controlStandard
Rollover protectionNot Available
Tire-pressure monitoring systemStandard direct 4-position monitoring
Emergency assistance systemNot Available
NHTSA crash test, driverNot Available
NHTSA crash test, passengerNot Available
NHTSA crash test, side frontNot Available
NHTSA crash test, side rearNot Available
NHTSA rollover resistanceNot Available

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