pai daca trebuie atunci depun aici diferentele. In plus tu ai citit in linkul ta numai inceputul. Sunt dezamagit.
Tot in linkul tau zice asa:
All-wheel drive (AWD) is often used to describe a "full time" 4WD that may be used on dry pavement without destroying the drivetrain, although the term may be abused when marketing a vehicle.[3] AWD can be used on dry pavement because it employs a center differential, which allows each tire to rotate at a different speed. ("Full-Time" 4WD can be disengaged and the center differential can be locked, essentially turning it into regular 4WD. On the other hand, AWD cannot be disengaged and the center differential cannot be locked.[4][5]) This eliminates driveline binding, wheel hop, and other driveline issues associated with the use of 4WD on dry pavement. With vehicles with more than four wheels, AWD means all wheels drive the vehicle, to varying degrees of engagement, while 4WD means only four of the wheels drive the vehicle continuously.Deci exact ce spuneam eu mai inainte!
________________________________________________________________________________
Si acum o sumara descriere a fiecarui sistem4-Wheel-Drive and All-Wheel-Drive Systems -- Know Your OptionsMore and more often, 4-wheel drive and all-wheel drive are becoming popular options not only for SUVs, but cars as well. All SUVs and pickup trucks offer 4WD systems, and even some minivans like the Toyota Sienna and Pontiac Montana, offer available AWD systems. Oftentimes, more than one system is available for any given vehicle, leaving consumers puzzled.
With so many options to choose from, it's easy for drivers to get confused by a barrage of acronyms, each more meaningless than the last. For most consumers, there are three basic options: Full-time 4WD, part-time 4WD, or all-wheel drive. Although each system has its own merits, one thing is certain--any 4WD system will make your vehicle less fuel efficient and more complicated to repair and maintain.
On the other hand, with 4WD you are less likely to get stuck in snow or mud. Most consumers want 4WD because it adds a measure of security to a vehicle, but finding out and deciding which system is right for you is both an important and complex job. Choose wisely.
Part-time 4WDThis most basic system provides a choice of settings that can be changed depending on your driving situation, but cannot be left engaged on dry pavement. If it is, the transfer case will wear, resulting in mechanical damage. The settings range from 2WD, 4WD High, and 4WD Low. In vehicles that have part-time 4WD, each of the four wheels constantly gets 25% of the torque to prevent wheelspin when in the High or Low setting. In newer models, the driver can shift from 2WD to 4WD High while driving, but must come to a complete stop to shift into the 4WD Low setting. 4WD Low should only be engaged in extreme off-road situations. One drawback of part-time 4WD is that it must be continually engaged and then disengaged in conditions of light rain or snow. This type of system is best for people who really don't need 4WD, but occasionally go off-roading and want a little extra security when it snows.
Full-time 4WDUnlike part-time 4WD, full-time 4WD, is just that--a system that can continually remain operating. This more advanced, convenient form of 4WD allows you to choose between all of the same settings, but can remain engaged while on dry pavement. Added to the High and Low settings is an automatic or full-time 4WD setting. As with part-time 4WD, the shift from High to Low must be made during a complete stop on most vehicles. Full-time 4WD is best for people who regularly drive in slippery conditions where constant shifting between 2WD and 4WD can become tedious.
All-Wheel DriveAll-wheel drive is similar to full-time 4WD in that the system is always sending power to the wheels with the most traction, but AWD has no 2WD switch. It is always operating in 4WD mode. When the road gets slippery, the AWD system locks the axles and automatically distributes power to all four of the tires. In many cases, AWD vehicles have no on/off switch. Some AWD systems are more rugged than others, though most can't be taken into extreme off-road situations. If the AWD system allows the driver to switch to a "low" range gearing setting, like in the Dodge Durango and Toyota 4Runner, then it is probably intended for severe off-road use. AWD systems work well in cars and crossover vehicles because they don't add much weight and make them true all-weather vehicles.
Safety MisconceptionsWhile 4WD and AWD may maximize traction better than 2WD, that doesn't necessarily translate into making it a safer vehicle. Oftentimes, drivers believe that because they can accelerate in snow just as quickly as on dry roads, they can do the same in terms of cornering and braking. On the contrary, 4WD and AWD do little to aid in cornering and nothing for braking ability on wet, snowy roads. Once moving, the physics of 2WD, 4WD, and AWD systems are pretty much the same. Rather than rely on AWD or 4WD, it's a better idea to think of them as an insurance policy that's there when you need it.
For most consumers, a set of quality all-season tires is a much better and less-expensive alternative to pricey and complex all-wheel-drive systems. Even the most advanced 4WD vehicle will be left spinning its wheels in the snow if they are shod with performance or touring tires.
Take a look at what kind of driving you normally do. Once you determine what type of vehicle best suits your needs, you can assess what type of system you need to get the job done. In some cases it may simply be 2WD with snow tires. In others, you may want to consider a more "robust" 4WD system with a low-range option. To help get a clear view off all your options, take a look at the following chart, sorted by vehicle class, that lists all the 2005 vehicles that offer AWD or 4WD systems.
Compact Car Drive Type
Mitsubishi Lancer all-wheel drive
Pontiac Vibe all-wheel drive
Subaru Impreza all-wheel drive
Suzuki Aerio all-wheel drive
Toyota Matrix all-wheel drive
Compact pickup truck Drive Type
Chevrolet Colorado 4-wheel drive
Dodge Dakota 4-wheel drive, all-wheel drive
Ford Ranger 4-wheel drive
GMC Canyon 4-wheel drive
Mazda B-Series 4-wheel drive
Nissan Frontier 4-wheel drive, all-wheel drive
Toyota Tacoma 4-wheel drive
Compact sport-utility vehicle Drive Type
BMW X3 all-wheel drive
Ford Escape all-wheel drive
Honda CR-V all-wheel drive
Honda Element all-wheel drive
Hyundai Santa Fe all-wheel drive
Hyundai Tucson all-wheel drive
Jeep Liberty 4-wheel drive
Jeep Wrangler 4-wheel drive
Kia Sportage all-wheel drive
Land Rover Freelander all-wheel drive
Mazda Tribute all-wheel drive
Mercury Mariner all-wheel drive
Mitsubishi Outlander all-wheel drive
Saturn Vue all-wheel drive
Subaru Baja all-wheel drive
Subaru Forester all-wheel drive
Suzuki Grand Vitara 4-wheel drive
Toyota RAV4 all-wheel drive
Full-size van Drive Type
Chevrolet Express all-wheel drive
GMC Savana 4-wheel drive
Large car Drive Type
Chrysler 300 all-wheel drive
Dodge Magnum all-wheel drive
Ford Five Hundred all-wheel drive
Mercury Montego all-wheel drive
Large pickup truck Drive Type
Chevrolet Avalanche 4-wheel drive
Chevrolet Silverado 1500 4-wheel drive, all-wheel drive
Chevrolet Silverado HD 4-wheel drive
Dodge Ram 1500 4-wheel drive, all-wheel drive
Dodge Ram 2500/3500 4-wheel drive
Ford F-150 4-wheel drive
Ford F-250/350 Super Duty 4-wheel drive
GMC Sierra 1500 4-wheel drive, all-wheel drive
GMC Sierra HD 4-wheel drive
Lincoln Mark LT all-wheel drive
Nissan Titan 4-wheel drive
Toyota Tundra 4-wheel drive
Large sport-utility vehicle Drive Type
Chevrolet Tahoe and Suburban 4-wheel drive
Ford Excursion 4-wheel drive
Ford Expedition 4-wheel drive
GMC Yukon/Denali 4-wheel drive, all-wheel drive
Nissan Armada 4-wheel drive
Toyota Sequoia 4-wheel drive
Midsize car Drive Type
Subaru Outback and Legacy all-wheel drive
Volkswagen Passat all-wheel drive
Midsize sport-utility vehicle Drive Type
Buick Rendezvous all-wheel drive
Chevrolet Blazer 4-wheel drive
Chevrolet Equinox all-wheel drive
Chevrolet TrailBlazer 4-wheel drive
Chrysler Pacifica all-wheel drive
Dodge Durango all-wheel drive
Ford Explorer 4-wheel drive, all-wheel drive
Ford Explorer Sport Trac 4-wheel drive
Ford Freestyle all-wheel drive
GMC Envoy 4-wheel drive
Honda Pilot all-wheel drive
Isuzu Ascender 4-wheel drive
Isuzu Axiom 4-wheel drive
Isuzu Rodeo 4-wheel drive
Jeep Grand Cherokee all-wheel drive
Kia Sorento 4-wheel drive
Mercury Mountaineer all-wheel drive
Mitsubishi Endeavor all-wheel drive
Mitsubishi Montero 4-wheel drive
Nissan Murano all-wheel drive
Nissan Pathfinder 4-wheel drive
Nissan Xterra 4-wheel drive
Pontiac Aztek all-wheel drive
Suzuki XL-7 4-wheel drive
Toyota 4Runner 4-wheel drive, all-wheel drive
Toyota Highlander all-wheel drive
Minivan Drive Type
Buick Terraza all-wheel drive
Chevrolet Astro all-wheel drive
Chevrolet Uplander all-wheel drive
Chevrolet Venture all-wheel drive
Chrysler Town & Country all-wheel drive
Dodge Caravan all-wheel drive
GMC Safari all-wheel drive
Pontiac Montana all-wheel drive
Pontiac Montana SV6 all-wheel drive
Saturn Relay all-wheel drive
Toyota Sienna all-wheel drive
Premium compact car Drive Type
Audi A4 all-wheel drive
BMW 3-Series all-wheel drive
Jaguar X-Type all-wheel drive
Mercedes-Benz C-Class all-wheel drive
Saab 9-2X all-wheel drive
Volvo S40 and V50 all-wheel drive
Premium large car Drive Type
Audi A8 all-wheel drive
Mercedes-Benz S-Class/CL-Class all-wheel drive
Volkswagen Phaeton all-wheel drive
Volvo S80 all-wheel drive
Premium large sport-utility vehicle Drive Type
Cadillac Escalade all-wheel drive
Hummer H1 4-wheel drive
Hummer H2 all-wheel drive
Infiniti QX56 all-wheel drive
Land Rover Range Rover all-wheel drive
Lexus LX 470 all-wheel drive
Lincoln Navigator 4-wheel drive
Mercedes-Benz G-Class all-wheel drive
Toyota Land Cruiser all-wheel drive
Premium midsize car Drive Type
Acura RL all-wheel drive
Audi A6/allroad quattro all-wheel drive
Cadillac STS all-wheel drive
Infiniti G35 all-wheel drive
Lexus GS all-wheel drive
Mercedes-Benz E-Class all-wheel drive
Volvo S60 all-wheel drive
Volvo V70/XC70 all-wheel drive
Premium midsize sport-utility vehicle Drive Type
Acura MDX all-wheel drive
BMW X5 all-wheel drive
Buick Rainier all-wheel drive
Cadillac SRX all-wheel drive
Infiniti FX all-wheel drive
Land Rover Discovery all-wheel drive
Land Rover LR3 all-wheel drive
Lexus GX 470 all-wheel drive
Lexus RX all-wheel drive
Lincoln Aviator all-wheel drive
Mercedes-Benz M-Class all-wheel drive
Porsche Cayenne all-wheel drive
Saab 9-7X all-wheel drive
Volkswagen Touareg all-wheel drive
Volvo XC90 all-wheel drive
Premium sporty/performance car Drive Type
Audi TT all-wheel drive
Porsche 911 all-wheel drive