Wood trim and leather upholstery are two of the primary perceptual marks of a luxury vehicle interior. They dominate the first view inside the QX4. Tastefully applied, they are complimentary elements of a well-designed space. Dashboard and door panels are attractively shaped from top-grade materials and are elegantly trimmed. As intended, the QX4 interior would look right at home in a Q45 luxury sedan.
Getting in or out requires a long step up or down, but once inside you'll find all the right pieces in all the right places. The speedometer, tachometer, water temperature and fuel level gauges are large. Big buttons are used for the necessary functions. Sensible rotary dials operate the climate control system. The radio buttons are a little fussy, and the electric mirror switches are hidden from view by the wheel. Overall, Infiniti's designers have done their work well.
A quiet, comfortable cabin is one of the QX4's greatest assets. The seats are as accommodating as they appear to be. Plush pile carpeting is underfoot and the QX4 seems even quieter than the Pathfinder. An excellent heating/ventilation/air conditioning system keeps interior temperatures at the desired level. This pleasant environment is complemented with generous cargo space.
On the debit side, taller occupants may find a little less headroom than they'd like, and adults sitting in the rear seats will wish for more head- and legroom. Also, the side step rail is too narrow for big feet, and tall drivers will find it in the way when getting in or out.
On the highway, the QX4 delivers a remarkably smooth ride. The stiff body structure allowed engineers to retune the springs and shock absorbers for better ride quality. Changes in road surface, freeway expansion strips and other irregularities are hardly noticed. In this regard, the QX4 meets standards set by more expensive SUVs. Road noise and vibrations are well suppressed. At cruising speed, a hum from the all-season tires is the most obtrusive sound.
In the case of the QX4, the soft ride does not come with mushy handling. In hard cornering, the body leans a fair amount, but overall the QX4 handles well. Speed-sensitive power steering strikes a nice balance between precision and low effort.
The QX4 performs well even when packed with a full load of passengers and cargo. The engine is responsive and quiet. Subjectively, it performs better than the power-to-weight ratio suggests. Fuel economy is about normal by class standards; our test average was 17 mpg. All QX4s are rated to pull a 5000-pound trailer. Braking was good in all driving conditions; ABS is standard.
As a break from everyday city and highway driving, we drove into the California desert where a pleasant surprise awaited. Unlike the Pathfinder on which it is based, the QX4 has a full-time four-wheel drive system. Called All-Mode 4WD by Infiniti, the system is designed around an electronically controlled mechanical clutch for the center differential. It apportions torque to front and rear wheels automatically based on inputs from driveshaft speed, throttle position and engine speed sensors. Up to 50 percent of the power can be directed to the front wheels if the rear wheels are slipping.
The QX4's all-wheel-drive system works extremely well. Traction was plentiful even in deep sand, and the constant changes in power apportionment as one wheel or another began to spin were completely unobtrusive. As a last resort, a shift to the low range of the QX4's transfer case provides low-speed urge to crawl out of extra-tough spots.
While not quite as capable as the Land Rover Discovery or Mercedes-Benz M-Class for intense off-road use, the Infiniti QX4 is capable of doing much more than most owners will ever ask of it. Infiniti's All-Mode 4WD system is a better choice for mixed conditions than the Pathfinder's more traditional four-wheel-drive system. That makes the QX4 the more sure-footed vehicle when snow, ice or rain are on the menu.