When Honda pulled the wraps off its luxury division in 1986, Acura’s promise—“Precision Crafted Performance”—was as much a guiding principle as it was a marketing ploy. The flagship Legend was a paragon of engineering virtue: finely crafted and unwaveringly reliable. It set a tone that has carried through to this day—to the 2014 RLX sedan, Acura’s latest image leader.In person, the RLX is substantial and handsome. Acura will have no trouble maintaining its long-held reputation for meticulous quality; paint and…