Pricier STS models arrive with a 4.6-liter Northstar V8, producing 320 horses and 315 lb.-ft. of twist. In addition to VVT, both powerplants operate according to electronic throttle control. A 5-speed automatic is the only transmission offered at the present. Both RWD and AWD are available in V8-powered Caddys, while V6 sedans initially make do with rear-drive only. Eventually, however, AWD will become available across the lineup. Under most circumstances this AWD system distributes torque in a 40/60 split favoring the rear. But when traction fades, all four wheels adjust to maximize grip. The AWD hardware works in harmony with StabiliTrak, GM’s electronic stability system that includes traction control. We drove all three models of this upgraded performance sedan recently, following a presentation in GM’s on-site NVH testing facilities, where a vehicle’s quietness is measured in every way imaginable. Whether it was at all by suggestion, or entirely objective, we found the first item of note was the STS’s quietness. Getting into the STS was easy with wide-opening doors, along with seats and a steering wheel that accommodate almost all body sizes and driving positions. After engaging the push-button start, we gave the upscale cabin high marks; however, despite the age of STS buyers having descended, we still feel its look and feel is for “mature buyers”.
|
