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Full Test: 2009 Infiniti FX50

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Road Test

Full Test: 2009 Infiniti FX50

Atomic Catfish

    4 Ratings
    It would be easy to dismiss the 2009 Infiniti FX50 as completely irrelevant, a mutant crossover vehicle.

    Going on past sales figures alone, you'd be right, because total 2007 sales of the Infiniti FX45 numbered just 1,598 units, about a tenth of the 2007 Infiniti FX35s that found their way to the street during the same period last year.

    But this wouldn't be entirely fair. The all-wheel-drive FX came to market in 2003 as one of the first crossovers that had morphed into a high-performance vehicle — a kind of personalized coupe, only with cargo capacity. The FX looked like a Bionic Cheetah, showcased some segment-leading technology and delivered road-going performance on par with European-brand sport-utilities the BMW X5 and Porsche Cayenne. Unfortunately, no one seemed to care.

    Yet now people are talking about personal-style crossovers. Have times finally caught up with the 2009 Infiniti FX50?

    Cryptozoology
    For a long time, the crossover coupe seemed like some kind of cryptid, a type of legendary beast that seemed likely to exist but for which no conclusive evidence had been offered. The BMW X5 took us in that direction, as did the Porsche Cayenne, Jeep Cherokee SRT8 and Range Rover Sport, but a genuine coupe-style crossover package didn't seem to yet exist.

    Fortunately now we have the 2008 BMW X6 xDrive 50i. Whatever the merits of the X6 might (or might not) be, its BMW badge has given the concept of a crossover coupe some credibility in the marketplace, and we all have suddenly understood what Infiniti was hoping to accomplish with the first-generation 2003 Infiniti FX. And with the introduction of the 2009 Infiniti FX50 at the 2008 Geneva Auto Show, we all awoke at last to the FX's possibilities.

    We're talking gene-splicing here, a chimera with a 390-horsepower V8. The FX has been trying to be a crossover coupe all along, and now the 2009 Infiniti FX50 makes the breakthrough.

    Speciality FX
    As before, the revised FX rides on Nissan's corporate FM (front midship) platform shared with the G35/G37, M35/M45 and, most recently, EX35 crossover. Think of the FX as kind of like the big M-class coupe (although we'd bet Infiniti would sell more than 1,600 versions of a real, car-based M50 coupe in a year).

    Just as you'd expect from a high-profile coupe, the 2009 FX50 is powered by a sophisticated 390-hp 5.0-liter V8 that primarily powers the rear wheels and all four corners when needed. The 303-hp FX35 can still be ordered in either a rear- or all-wheel-drive configuration.

    This time around, a generous amount of previously optional equipment becomes standard on the range-topping FX, which helps explain our estimated base price of $54,000, about $4K over that of the outgoing FX45. Now included as standard equipment are the Navigation package (now based on a hard drive and offering 9.3GB of digital music file storage), Premium package and iPod connection, roof rails and moonroof.

    As before, standard equipment on the FX50 includes all the usual acronyms: TPMS (tire pressure monitoring system with four-corner readout), ABS with EBD (electronic brakeforce distribution) and TCS (traction control system) with VDC (vehicle dynamic control).

    TLAs for Days
    As a matter of fact, the 2009 FX50 flaunts more TLAs (three-letter acronyms) than an IT convention. Warning: more alphabet soup ahead.

    Our test FX features the optional Technology package that includes: LDW (lane departure warning that beeps); LDP (lane departure prevention through selective brake application); and ICC (intelligent cruise control) with DCA (distance control assist) that maintains following distances at speed, plus IBA (intelligent brake assist) that will bring the FX to a complete stop and then resume a selected speed automatically.

    Although we would never condone such a hands-off test (caution, trained professionals on closed course only), the presence of LDP, ICC and IBA in active mode theoretically makes it possible to drive HOME (hundreds of miles easily) without touching a pedal — or the steering wheel. Theoretically, of course.

    The Crucible
    Riding on standard 265/45R21 Bridgestone Dueler H/L all-season tires, the 4,575-pound FX50 snakes through the slalom course like a true AWD sport wagon at 63.3 mph, almost 4 mph faster than the last FX45 we tested.

    Nimble though this is, such an unnatural test of multiple lane changes makes the FX50 feel a little out of sorts, and eventually it runs out of grip at the rear. Basically it defies the limits of physics at about eight-tenths speed, but things go a little pear-shaped at the limit when the rotating mass of each monster wheel-tire combination gives the electronically controlled all-wheel-drive system a workout.

    On the skid pad, the FX50 proves more predictable and shows amazing grip at 0.85g before it begins to oversteer again, which is highly unusual for an AWD vehicle (although we like that). Despite rollin' on 21s, the FX50's ride is quite good, although the interior resounds with a low-frequency boom over sharp seams in the pavement.

    Big Engine and Its Consequences
    Speed is the 2008 Infiniti FX50's prime directive. The 60-mph mark flashes by in just 5.6 seconds, as compared to the 6.8 seconds required by the FX45's 60-mph sprint. Plus, when the tach needle sweeps past 4,000 rpm, there is a conspicuous extra surge of power from the FX50 V8 courtesy of its sophisticated system for variable valve timing and lift. From behind the wheel, we could hear an unmistakable rumble, but it wasn't so loud as to be annoying.

    The FX50's quarter-mile performance of 13.7 seconds at 102.9 mph would be good enough to challenge this year's performance surprise, the twin-turbo BMW 135i. With its new seven-speed automatic clicking off admirably quick upshifts to keep the engine in its power band, there's hardly a moment when the FX50 doesn't feel geared up for action.

    But we have a great big caveat here. By the third quarter-mile pass at over 100 mph, we noted dramatic brake fade coming to a halt, and there wasn't even enough brake pressure to activate the ABS. The ventilated brake discs would appear to be big enough in diameter to dissipate heat (14 inches up front and 13.8 inches in the rear), but perhaps not repeatedly, and apparently not from super-legal speeds.

    This fading wasn't apparent, however, during the usual five to six stops from 60 mph that comprise our brake test, where the FX50's first stop took 124 feet and its best stop of 117 feet occurred on the fifth attempt.

    Head-Turning Styling
    That's what Infiniti says the FX has, but what it neglected to predict was in which direction the heads would turn. Try as we did to find a flattering camera angle to best portray the color-shifting paint of the FX and its restyled, double-arch, black chrome grille, the Infiniti always filled the frame with its toothy maw. And what new vehicle would be complete without obligatory chrome-plated mandolins adorning the front quarter panels? At least these are functional here and help vent the air that typically builds up underhood in any car, improving high-speed stability.

    Inside the cabin, the FX50 gets the deluxe treatment. We love it. Diamond-quilted leather-upholstered seats are comfortable and sporty; the fronts are both heated and cooled and the driver seat is eight-way adjustable. Standard shift paddles click off matched-rev downshifts through the all-new seven-speed automatic.

    We don't normally review HVAC systems, but the FX's product information devotes several detailed paragraphs to the Plasmacluster ionizer air purifier and allergen-neutralizing grape-seed polyphenol filter. Cool stuff.

    The cargo area has been "reshaped to enhance comfort and utility," but our stats show that its volume has actually shrunk by 2.6 cubic feet with the rear seats occupied and 3 cubic feet when they are stowed. What's more, only the front legroom has grown, while front and rear headroom are both diminished due to the now-standard moonroof.

    In a Class of Two?
    True, there are extant examples of selectively bred truck-based SUVs like the 425-hp 2008 Jeep Grand Cherokee SRT8 at $41,500, but in terms of refinement, sophistication and equipment levels, the FX50 really does stand closer to the Euro super-utes than it does with the domestic muscle trucks, something that helps validate the 2009 Infiniti FX50's premium price.

    You could say that the Porsche Cayenne S belongs in this hyper-ute gene pool as well. But the Cayenne, with its wider range of talents, really is a more specialized beast because of its optional trick off-road gear — and you'll pay handsomely for that extra, mostly untapped, capability. Have a look at the $112,000 2006 Cayenne Turbo S. We'd also have to disregard the $88,000 Bel Air driveway accessory, Mercedes-Benz ML63 AMG, because its hand-built 503-hp V8 functions as a similar extra-cost feature.

    So this leaves the 390-hp 2009 Infiniti FX50 with its estimated sticker price of $54,000 alongside the 300-hp 2008 X6 xDrive 35i with its base price of $53,275 in a class of their own. (The twin-turbo 400-hp 2008 BMW X6 xDrive50i will set you back $63,775.) Crossover coupes to be sure, but so far only a half step away from cryptids.

    So for all its specialized gizmos, admirable muscle, undeniably unique skin and what appears to be a relatively fair price, it looks like Infiniti's Atomic Catfish will be a big, weird-looking fish in a little pond yet again.

    The manufacturer provided Edmunds this vehicle for the purposes of evaluation.

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    glupu1 says:

    07:18 AM, 09/14/2010

    Do you think the FX50s is better to get then the FX 50-inotherwards is it worth the money. Also is the FX50 far superior then the FX35. Also in you ropinion is the BMWx6 drive 35i  better then the FX 50.

    What would be your first second and third choice. Thanks

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    Speed Read

    Featured Specs

    • 390-hp V8
    • 7-speed semiauto transmission
    • All-wheel drive
    • Gizmos galore

    What Works

    Potent horsepower upgrade; new double-wishbone front suspension; up-to-the-minute infotainment and safety systems; nimble and did we mention, fast.

    What Needs Work

    A face only a catfish's mother could love; spooky brake fade; thirst for premium fuel.

    Tags

    Specs & Performance

    Vehicle
    Model year2009
    MakeInfiniti
    ModelFX50
    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.
    Drivetrain
    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
    Chassis
    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
    Turning circle (ft.)36.7
    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
    0-60 with 1 foot of rollout (sec.)5.3
    0-75 mph (sec.)7.9
    1/4-mile (sec. @ mph)13.7 @ 102.9
    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
    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
    Warranty
    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
    Safety
    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
    CollapseSpecs and Performance Expand Collapse

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