The Sport models are tuned for those who like to feel in closer touch to the pavement, as it's fitted with shorter springs for a slightly lower ride height, stiffer shocks and low-profile performance tires on 18-inch wheels.
The available Airmatic Dual Control suspension replaces the standard steel coil springs with air springs. This computer-managed system adjusts the air pressure to the spring at each wheel, based on road conditions or driving style, to slightly soften or firm the ride and to add or decrease body roll (lean) in corners. In combination with electronically adjusted shock absorbers, the air suspension can automatically improve ride quality or handling or optimize the balance of the two, depending on where the car is traveling and whether the driver is cruising or driving quickly. The system works automatically, without switching suspension settings between sport and comfort.
The variable-power steering system was improved for 2007 with a 10-percent quicker ratio for more precise control of front wheel direction. The system provides more boost for easy turning at low speeds and less for more progressive steering response and feedback at higher speeds. With 2.6 turns lock-to-lock compared to the previous system's 3.3 turns, we found the new steering makes maneuvering through crowded parking lots easier and more pleasant, and far more responsive in the corners.
One of our gripes with the 2006 models was the braking system. All of the E-Class cars came with Sensotronic Brake Control, commonly called brake-by-wire, because the connection between the brake pedal and reservoir of brake fluid is electronic, not mechanical. Although we found them to be excellent in terms of performance, with stops straight, true and short, repeatedly, with virtually no brake fade, we didn't care for the way they engaged, which we felt was too abrupt, especially in commuter crawl mode. They do, however, have their advantages. The electronic system can apply brake force to each wheel independently, helping to keep the car traveling straight and true during panic stops, even on bumpy, uneven roads. It will also keep the brakes on full in an emergency situation, as measured by sensors, even if a driver inadvertently eases off the brake pedal. And if it's raining, the system periodically, lightly, applies the brakes to sweep them dry. Still, the brake-by-wire had its quirks. Several testers found them difficult to modulate in everyday driving, making smooth braking around town a challenge. In short, we didn't really like them.
For 2007, the Sensotronic control has been removed from the brake system, which is essentially unchanged except for the now ultra-smooth grasp of the binders, even at slow speeds. Each E-Class model has progressively larger brake rotors and more complex piston designs to complement the engine's power and corresponding speed potential.
The E-Class wagons give up almost nothing to the sedans in performance, fuel economy or handling dynamics.
The E350 comes with a 3.5-liter engine introduced for 2006, which was the first Mercedes V6 with dual overhead cams and four valves per cylinder. The 3.5-liter V6 generates 268 hp and it matches well with the high-tech seven-speed automatic transmission that comes standard. The E350 is as responsive as any V6-powered car we've driven. The 3.5-liter V6 has fully variable valve timing, delivering an impressive amount of torque from idle all the way to redline. The E350 responds immediately, no matter how fast it's already traveling when the driver dips the gas pedal. The 3.5-liter engine is also appreciably smooth, particularly at high rpm. And thanks to the seven-speed automatic, it delivers decent fuel mileage.
The new E320 Bluetec diesel gets vastly superior fuel economy, however. It's expected to deliver 27 city/37 highway mpg. With predominantly highway travel, this gives it a range of 600-700 miles per tank. The Bluetec replaces the diesel-powered E320 CDI, which was an impressive car, but the new diesel is better and cleaner. It's designed to run on the ultra-low-sulfur diesel fuel introduced into the U.S. starting October 2006. Mercedes' first V6 diesel, the Bluetec features all the latest high-tech goodies, including turbocharging, a variable nozzle turbine, four valves per cylinder, exhaust gas recirculation and a third generation of CDI, the common-rail direct-injection system that delivers fuel to the engine at an incredible 23,000 psi (compared to 100-250 psi in a typical gasoline engine).
Yet the technology matters less than the results. The diesel V6 puts out a modest 208 hp, but is backed up by a resounding 400 pound-feet of torque that begins as early as 1600 rpm. In other words, this baby hauls. There's no smoke to be seen or smelled. Four after-treatment units in the exhaust stream help make the Bluetec V6 the cleanest diesel powerplant in the world. (Initially, it will be sold in 45 states only, but Mercedes-Benz expects that a further evolution of Bluetec will allow diesel Mercedes to be sold throughout the United States in 2008.)
We drove the E320 Bluetec sedan through the deserts and mountains surrounding Las Vegas, and it exhibited all the attractive traits of the gasoline-powered Benzes, and more. As well as being as smooth and quiet as any of the world's luxury sedans, Bluetec comes with a powerful character all its own, owing to the massive yank of torque that pulls the car from 0 to 60 mph in just 6.6 seconds, only a tenth of a second behind the gas-powered E350 sedan. In other words, forget everything you know about diesel-powered cars built in the 1970s, '80s or '90s. Slow starting? Not anymore. Like all diesels, the E-Class version still needs electric glow plugs to heat the combustion chambers before starting, but we never noticed.
Unpleasant odors? You'll still experience that oily diesel smell at the truck stop when you fill the E320 Bluetec's tank, but once the filler cap is back on and the car is running, there will be no unpleasant fumes inside or out of this E-Class. Excessive engine noise? At idle, during warm-up, we heard the rapid tick-tick of diesel noise more loudly than anything coming from the gasoline-powered E350's engine, but once underway, there was zero difference in the amount of engine noise reaching the cabin compared to other E-Class models. That extra bit of noise is more than offset by the Bluetec sedan's excellent benefits.
With 400 pound-feet of torque, more even than the E550 boasts with its V8, the turbodiesel V6 makes a winner of the E320 Bluetec in almost any stoplight derby. The 3,860-pound sedan, though no lightweight, jumps forward quickly enough to spin the back tires just by jabbing the right pedal, if you've switched the traction control off. Itsturbocharger also provides a level of immunity from the power-robbing effects of high elevation, as we discovered in our climb up Mount Charleston northwest of Las Vegas. And on one quiet desert road, we reached the electronically limited top speed of 130 mph without breaking a sweat.
That said, there's nothing like the E550's V8 power for smooth, exhilarating acceleration. This V8 is sweet from idle to the 6000-rpm redline, and with 382 hp and 391 pound-feet of torque (up from 302 horsepower and 339 pound-feet in the E500), the E550 flies. From a stoplight or from 70 mph, there's a deep well of torque underfoot and plenty of acceleration, good enough to take it from 0 to 60 mph in 5.2 seconds. Throughout our first drive of the E550, on the high-speed autobahns of Germany and over the twisting roads of the Bavarian Alps, it provided a stellar combination of performance and luxury, sharp handling and passenger comfort. In short, the Mercedes E550 is as nearly perfect a sports sedan as has been developed by anyone.
The seven-speed automatic transmission improves acceleration, performance and response, but it also enhances fuel efficiency when compared to a more common five-speed automatic. Gear changes are barely noticeable, especially in the higher gears. This transmission allows significantly quicker acceleration for highway passing situations. And it doesn't have to go through every gear: Step on the gas and the transmission will skip down to the appropriate gear, switching from seventh to fifth, for example, and from there directly to third, meaning two downshifts instead of four. Both of the transmissions also offer three individual driver-selectable shift programs to alter the shifting characteristics from comfort to sport to full manual gear selection.
The 2007 E63 AMG sedan and wagon operate on another plane entirely. Their race-bred naturally aspired 6.2-liter V8, which is being offered in a variety of Mercedes models, delivers 507 hp and 465 pound-feet of torque, compared to 469 hp and 516 pound-feet of torque in the outgoing E55 AMG. The previous models got their power courtesy of an intercooled Lysholm screw-type supercharger, which helped rocket them from 0 to 60 mph in 4.5 seconds, but the new, big V8 makes the cars even faster: 4.3 seconds from 0 to 60 mph. Plus, the new V8 emits less harmful emissions than the supercharged engine and weighs 55 pounds less.
The 6.2-liter V8 is the first Mercedes engine to be totally engineered and built at the AMG facility, and the firm put every bit of its long motorsports experience into it. The all-aluminum engine features four valves per cylinder, a variable intake manifold made of magnesium, variable camshafts and a special low-friction cylinder wall treatment, but the most important part is it performs and growls like a big V8.
The five-speed automatic in the E55 AMG has been replaced by a more efficient seven-speed automatic with AMG-tuned Speedshift programming. Like the five-speed, it shifts quickly up or down (though without the throttle blip of some manu-matics), doesn't hunt back and forth for the right gear, even in hilly terrain, and it rarely shifts unless the driver changes the angle of the gas pedal, which is good. When the driver prefers, an auto-manual shift mechanism allows a high level of control over gear selection. Either by toggling the shifter left or right or using the paddles on the steering wheel, the transmission shifts quickly up and down at the driver's discretion. The system will hold the selected gear indefinitely just below the 6000-rpm redline, but it won't let you bump the engine off its rev-limiter without shifting up a gear. Should the mood strike, a driver can run through the gears or challenge a curving stretch of road almost as if it was a fully manual transmission. Drivers who like that sort of thing might gripe about the lack of a blipped throttle during downshifts like some other transmissions of this type deliver, but that's a minor point that will be moot to almost everyone else. Most of the time, we simply put it in Drive. Even the high-performance E63 AMG is so quiet that the driver forgets just how powerful and fast it is until the throttle is opened up. Next Page