Test the tech: Detour guide
While the 2008 Cayenne Turbo's Porsche Communications Management (PCM) navigation system generally failed to impress us (see the In the cabin section below), one of its features did manage to pique our interest. To the right of the in-dash LCD screen, a button with a squiggly line indicates the navigation system's Diversion function, which enables drivers to quickly reroute in the event of unexpected traffic or road closures on the suggested route. A push of the button brings up a screen that requests the distance of the current route that is blocked.
To test the system, we resolved to program in a destination, then, while under route guidance, to continually reroute, noting how quickly and how accurately the system managed to get us out of the current spot, while still keeping us on track to our destination. In practice, the system works well: it gets you off the current road as quickly as possible--often at the next available turning. When diverting, we found the system often put us on a parallel road one block over from our original route to minimize the additional distance for our overall journey.
However, we did find one significant flaw in the system: without a very timely radio report or real-time traffic information, which is unavailable on the PCM navigation system, it is often impossible for drivers to tell how much of the road ahead is blocked. Accordingly, the Diversion function is only going to be as good as your information on the traffic situation ahead of time, and if you have such information, you might be more inclined to route around the trouble spot before setting out.
In the cabin
The interior of the 2008 Porsche Cayenne Turbo is generally well laid-out with simple, classy appointments and materials, including the leather-covered cowl and door panels, and the silvery matte trim on the steering wheel and dash. We're not sure why Porsche opted for the cheaper-looking white plastic on the central console, though. The as-standard black leather seats in our tester were firm and supportive, suggesting that they were designed with lateral forces in mind: the presence of grab-rails on both the driver- and passenger side of the central console confirm the suspicion. For those who want "smooth" rather than "natural" looking leather, an optional $395 upgrade is available, and for an extra $270, you can get the Porsche emblem embossed on the headrest. Buyers of the Cayenne Turbo are given the "option" of one of two pricey alternatives for upward visibility: a $1,190 outlay gets you a moonroof, while $3,900 gets you a panoramic roof system.
As with other high-end SUVs, such as the 2007 Range Rover Supercharged and the 2007 Audi Q7 4.2 Quattro, the Porsche Cayenne Turbo includes GPS navigation as standard. Unfortunately, that's about the most attractive thing about the nav system, which we found to be disappointingly reminiscent of the clunky and outdated COMAND interface found on lower-end Mercedes-Benz models. Like the COMAND system, the Porsche navigation interface comprises a bunch of black-plastic hard buttons surrounding a small, non-touch-screen display set low in the dash.
Destinations must be entered using a spindly, push-in/rotary knob to the right of the screen, which can be used to input place names just one letter at a time. We found programming the system to be time-consuming and unintuitive, especially the way in which the knob must be rotated counter-clockwise to move down through a vertical list of options, in contrast to nearly every other electronic system in the western world. On the positive side, the DVD-based navigation was quick to calculate routes.
Once under way, the maps on the Cayenne's small LCD screen are colorful, but hardly state-of-the art in terms of crispness or clarity: in comparison with the navigation system in the 2008 Toyota Highlander, for example, the maps look at least one generation old. Turn-by-turn voice guidance is adequate (if a little shrill in its commands), although, in keeping with its outdated feel, the Porsche system does not feature text-to-voice technology for calling out the names of individual roads en route. The most advanced feature of the Cayenne's navigation system is its handy reroute button (the squiggly line to the right of the display), which acts as a one-touch shortcut to programming a detour around traffic congestion or other road incidents.
For entertainment, the 2008 Cayenne Turbo fares slightly better with an as-standard Bose-branded surround-sound audio system hooked up to a single-disc in-dash changer that can play CDs as well as MP3- and WMA-encoded discs. For the latter, audio tag information on folder, artist, and album is displayed on the main LCD display, while folder and track number show up in the full-color display in the instrument cluster. For those who want to play more than 15 tracks at a time while driving the Cayenne Turbo, options are limited. There is no dedicated, "intelligent" iPod interface, nor is there any sign of a generic auxiliary input jack for low-fi connection to a portable audio player.