Small overlap crash test
Small overlap crash test
2:06

Small overlap crash test

Auto Tech
In the beginning, there was four-wheel drive in 4x4s. Tough off-roaders like early jeeps or Dodge Power Wagons. In their gut was a second gear box called the transfer case that split the power coming out of the transmission, sending it for an app and it was controlled by a second gear lever inside, and then there were geared hubs. You have to get out and lock by hand for max off-road traction. Driving all wheels then was not for the faint of heart. But today, it's a highly sought after feature in cars as different from a jeep as this Jag. Why? Well, two main reasons. Neither of which will necessarily ever take you off the road. Weather. In the snow, all-wheel drive is much better than rear-wheel drive or even front-wheel drive to get power through the snow to the road. Performance. All-wheel drive is much better taking all the engine's power and getting it to the road through the maximum number of wheels to get around the corner fastest or just off the line. This Jaguar XJ is a good example of both modes. Its all-wheel drive system biases the power mostly to the rear wheels by default, but when wheel slip is detected, up to 50% of the car's power is sent to the front wheels. Usually, before you even know it's needed there. Rear wheel drive is the classic layout for great handling, except in snow where it tends to spin and slip and leaves you stranded. Most cars today are front-wheel drive. Mostly for efficiency reasons but that also does tend to land better snow traction but both the two-wheel drive systems leave half the wheels largely unused and both suffer from cornering issues. Either over steer when the rear of the car wants to come around in the corner or under steer, when the front-end sort of plows to the outside of a corner. Enter all-wheel drive. But you know Subaru for their obsession with all-wheel drive today, but you may not know they started all this. 1971, the Leone, the first regular car that had all-wheel drive stuck under it. For the first time, you could drive something that wasn't a truck and get out of all those things kind of trouble on the road. Then at 1980, all-wheel drive got cool with the arrival of the Audi Quattro and its eponymous all-wheel drive system. It's rally car DNA completely repositioned all-wheel drive as something you didn't just use a few days in the winter. It opened the consumer's eyes that all-wheel drive is a performance thing. Then in 2004, Honda brings out super handling all-wheel drive. The first that could bias power not just between the front and rear wheel sets but also differently across the left and right rear wheels, using power for cornering in a completely new way that is still cutting edge. -Simultaneous and continuous control ensures that the optimum amount of torque is always distributed to each of the 4 wheels. -Now, this 13 pathfinder is a good example of how cars have technology that allows all-wheel drive to become much more gentrified, to be honest. You don't need to understand anything about low range or locking hubs to get the most out of the system. Check it out. Here's what it's come to. You got a knob now that handles all-wheel drive. No more big old levers and transfer case handles. This thing defaults to auto, which is very telling. You can also roll it to two-wheel drive or put it in lock if you even know what that's for. Typically, you leave it in auto, it'll figure out the rest. I first saw this on Land Rovers. They have-- what they call terrain response control. You rotate this knob to rock or mud or snow. Jeeps do something similar but eventually, I think this highly simplified control is the real harbinger of the future and after this, the computer will figure out what you're stuck in. And it will do that that knob's job for you. Okay. Now, reality check. All wheel-drive is not just milk and honey, and traction and cornering. It's got some downsides. First cost, all-wheel drive, adds a fair amount of serious hardware over front or real wheel drive and that can add a couple thousand bucks or more to the MSRP. Complexity. All-wheel drive does create more to go wrong and more than has to be shoe-horned underneath the belly of a car. Efficiency. All wheel-drive cars may give an MPG or 3 on the highway or on city fuel economy due to both added weight as well as more hardware to be turning all the time, depending how the system is designed. Look, rear wheel drive will still have its place in particularly performance automobiles, front wheel drive will remain the main stream drive system for most car. But all wheel drive is getting closer to being there. Partly because the cost is now fairly modest to add it on, and party because it becomes so much easier to use. The seamless, digitized transparent sort of think for your systems. Have made all-wheel drive a lot more approachable for a lot more drivers. If it weren't for the cost penalty and some MPG penalty, it would be the [unk]. -I'm getting power to the road.

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