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.[...]
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