Road Test: 2004 BMW X5 4.8is vs. 2005 Volkswagen Touareg V10 TDI vs. 2005 Mercedes-Benz G55 AMG vs. 2005 Porsche Cayenne Turbo
Defying Newton
Excellent as our performance all-arounders are, here are three reasons why they'll never outhandle a cornering specialist. Porsche Cayenne versus 911 Carrera.
1. Height of the center of gravity
A number that car companies are reluctant to disclose. The Cayenne's CG is probably about 40 percent taller than that of its Porsche stablemate, the 911 Carrera. This height (along with track narrowness) predicts lateral weight transfer during cornering. And the greater the weight transfer, the less grip you'll have.
2. Roll inertia
Like the spinning ice skater who twirls more easily with her arms tucked in, the tightly packaged 911 has less roll inertia than the comparatively ponderous Cayenne. This is a vital ingredient for fast reflexes on a snaking road.
3. Unsprung weight
The Cayenne's off-road-suitable wheels, tires, and suspension components mean greater unsprung weight, making it difficult for its tires to follow the road's irregularities. Bottom line: A 911's lighter-duty componentry helps it stick better to the road.
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