Cadillac has done a marvelous job of eliminating noise, vibration and harshness from the operation of the powerful Northstar
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| The Northstar powerplants have always been smooth, quiet performers; however, cutting edge engineering has further refined the operation of this strong runner. (Photo: Rob Rothwell, Canadian Auto Press) |
engine. These powerplants have always been smooth, quiet performers; however, cutting edge engineering has further refined the operation of this strong runner. From idle to its 6,600 rpm redline nothing but honey is extruded, along with an invigorating wallop of power. Cadillac claims the STS V8 will thrust itself from 0 to 100 km/h in just 6 seconds. That's darned impressive for a luxury cruiser weighing in at 1,779 kg (3,921 lbs). The extra oomph of the V8 over that of the V6 results in a Caddy that never has to work to keep up with traffic, if not well ahead of it. The Northstar's flat torque curve is very versatile. Power comes on immediately and stays in place until the right foot lightens or GM's ultra-smooth shifting Hydra-Matic 5L50-E, five-speed automatic transmission says it's time for a higher gear.
Cadillac has augmented the Hydra-Matic gearbox with a manual-shift mode, which enhances the performance-car feel of the STS. Downshifts for passing are completed without delay or fuzziness. Snapping the throttle will rapidly engage the most effective gear, without
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| I would prefer to hear just a little more burble from its twin pipes, but that's my preference. (Photo: Rob Rothwell, Canadian Auto Press) |
delivering a neck-snapping jolt. As speed quickly increases, the passenger environs remain serene and calm, with only a hushed growl emanating from somewhere fore of the cabin. Whether under full acceleration or loafing about town, the STS is very quiet. In fact, I would prefer to hear just a little more burble from its twin pipes, but that's my preference and it may not be representative of the target group Cadillac has tuned the STS for. However, a degree of quiet that I really appreciate in a vehicle pertains to its ability to quell the intrusion of road and wind noise; in this aspect the STS is a standout. Regardless of speed, occupants in the STS are treated to exceptionally low levels of tire drone and wind rush, not to mention an agreeable ride.
