Test-Driving Porsche 911 Turbo Cabriolet: 480 Horsepower

STUTTGART, Germany -- Dawn is breaking as I turn onto the autobahn south of Stuttgart behind the wheel of Porsche's new 911 Turbo Cabriolet, which has just gone on sale in the United States.

I hit the gas, and in less than four seconds, I've blasted from standstill to more than 62 mph -- something you'd normally need a sports motorcycle to do.

In about 13 seconds, I'm racing at over 125 mph -- and then I realize I'm only in fourth gear. A few seconds later, I'm briefly cruising at about 170 mph in fifth gear, with plenty of room to go before reaching the max speed of 192 mph. However, one emotion prevents me from taking the car up to the sixth and highest gear: fear.

I'm too scared to put the Porsche into top gear, even though I'm on a half-mile stretch of straight autobahn and in complete control of the car. But then again, I'm going as fast as a jet taking off from a runway.

As I grip the steering wheel, passing more cars than I'd expected to meet at daybreak, I'm concentrating too hard to think about the automated gadgetry that makes this high-thrill driving possible.

The new Cabriolet Turbo is not merely a convertible version of the 911 coupe, some hardtop with the roof sawed off. Added are electronic sensors and an aerodynamic design that couple better handling with power.

This reddish color might not be everybody's favorite, but the TomTom GPS (an after-market extra) would come in handy for most drivers.

Photo: Patrick Schmid

As I steam along, the electronics are hard at work. The car feels as if it were gripped to the pavement by train tracks, giving me the freedom to choose the trajectory I want, when I want.

At 8:30 a.m., when traffic becomes too thick for (reasonably) safe high-speed driving, I slow down to 125 mph.

Its time to listen to some music. I wonder, though, how this will be possible at such a high speed. Already, its very loud, and with a passenger in tow, it's difficult to talk without shouting.

Somehow, though, I can hear the words of Rush’s Red Barchettaover the sound of the motor, as the wind blows my hair back like a horizontal buzz cut.

The Bose sound system makes this possible by piping the music through 12 loudspeakers and a seven-channel digital amplifier. Unlike the coupe version of the 911 in which the sounds come from the back, the speakers are positioned closer to the front, along the foot well.

To better gauge the 911’s electronic controls, I leave the autobahn for a smaller highway that winds through a forest. It has just rained, and the pavement is wet.

Accelerating out of a curve at 60 mph in second gear, I accidentally pop the clutch. A massive jolt blasts me forward. The acceleration is way faster than I expect.

Instantly, the Porsche's electronic stability-control system transparently takes over. But it's almost too fast. I instinctively start to countersteer to adjust for the sliding back end of the car, but the car has already righted the front-wheel traction to compensate for the lateral motion.

The 3.6-liter engine relies on a variable-geometry, turbocharged engine to crank up to 480 horsepower and a top speed of 192 mph, with an average Porsche-specified gas consumption of about 22 mpg.

Photo: Bruce Gain

To get you out of trouble, the Porsche's computer and sensor systems perform thousands of computing tasks in milliseconds.

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