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Why is there a huge bulge in 2021 Lexus IS 300 AWD's driver footwell? We explain

After an initial turn a few weeks ago for the 2021 Lexus IS first drive review, the revised luxury sedan has returned to the Autoblog garage for a second look. This middle-of-the-road IS 300 AWD pairs a 260-horsepower V6 with a six-speed automatic transmission and four driven wheels, and frankly it's the least interesting way to spec out the redesigned sedan. While there are cars in this segment designed to get a performance boost from their all-wheel-drive systems even in dry conditions, the IS isn't one of them. Adding insult to injury, you get stuck with a cramped driver-side footwell care of the engineering shenanigans that went into making this system possible.  While we've mentioned this particular compromise before, we rarely touch on the reasons why it exists in the first place. The fundamentals are fairly obvious; the standard IS utilizes a longitudinal, rear-wheel-drive powertrain. As is typical with this configuration, the transmission sits in a tunnel beneath the center console. This arrangement works just fine, provided you don't need to power the front wheels.  To do so in a traditional car like the IS requires a literal end-around maneuver involving the engine and transmission, which we've diagrammed for you below care of MSPaint. This is a bit simplified for the sake of this write-up, and it should be noted that this is not the only way to implement AWD in an inherently RWD platform, but it illustrates how the power for the front axle (red) and rear axle (blue) flows from the transmission to the drive wheels. To get juice flowing to the front axle, Lexus had to add a parallel output shaft, exiting the transmission from the front with enough clearance for the bell housing and engine, which sits between the transmission and the front differential. This requires quite a bit of lateral reach, meaning the housing has to extend much farther out than usual to accommodate it (yellow arrow). As a result, the all-wheel-drive transmission looks a lot like a sci-fi gun with a chunky drum magazine hanging off the side of it. The hump (above right) in the footwell is there to clear this protrusion. This basic configuration isn't unique to Lexus. In fact, if you look at a BMW xDrive cutaway, it's similar. So, why no "hump" in other cars? There are multiple factors, but to boil it down to what is most relevant, it's a combination of the resulting shape of the Lexus transmission housing and the size of the IS chassis.

Lexus LM is a first-class minivan that's not for America

Although they might get a bad rep for not being "cool," minivans can be some of the most unique and interesting vehicles on the market. Their spacious size and clever packaging allows for design and functionality that cannot be found in any other type of family hauler. Lexus proves as such with the debut of its flagship luxury MPV, the LM, a wild-style van that can be ordered as a sort of personal private limousine with a 26-inch screen. Sadly, it's only for China and other Asian markets. Based on the Toyota Alphard, the LM caters to a Chinese market that places major importance on luxury and comfort for the on-the-go business professional. That means privacy and space, so in addition to a seven-seater configuration, the LM can be ordered in a four-seat chauffeur setup. It includes two gigantic reclining captain chairs (separated by an armrest with built-in touch control panel), a partition with power glass and a built-in 26-inch screen, a 14-liter fridge, umbrella storage, and a 19-speaker sound system. To ensure optimal tranquility, the van has double-layer noise-reducing glass. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. No matter the intended use of minivans, whether for an executive or a sleepy four-year-old, one of their strengths is ride comfort. Lexus says the LM uses swing valve shock absorbers, a technology that was introduced on the cushy Lexus ES, to maintain an undisturbed and balanced ride. In addition to the choice of seat layout, buyers will have the choice between two drive setups and two powertrains. The LM 350 will have a 3.5-liter engine, while the LM 300h will use hybrid power with a 2.5-liter Atkinson four-cylinder engine. The LM will be available in front- or all-wheel drive. As for the styling, well, it builds on the already extreme exterior of the Alphard, with slightly more chrome. The spindle grille has never been a passive feature, and this is one of the biggest applications Lexus has ever approved for production. The body, however, features muscular curves and sharp lines for an overall sleek effect. It is available in black and pearl white paint schemes. Just not for the U.S. market.

2014 Lexus IS350 F-Sport

Is A New Kind Of Lexus Hiding Under That Radical Skin?
When the now-outgoing Lexus IS generation was launched back in 2006, the company would not have been wise to bring the compact luxury sedan to be driven by journalists to a track like Driveway Austin Motorsports. Taking along a BMW 335i for comparison loops would have proved an ill choice as well.
Our own Jonathon Ramsey found the current-generation Lexus IS250 to be fairly nimble over a tightly wound autocross course, when he drove it back-to-back with the prototype version of this 2014 IS a few months ago. Our track for testing the fully realized version of the IS350 F-Sport meanwhile - again with the 2013 version along for competitive driving - was on a circuit designed to string together recreations of some of the best tracks in the world. Laguna Seca, bits of the Nürburgring and sections inspired by Imola and Ferrari's Fiorano test track all make for a far more enticing road course than you'd expect to find plunked down in a nondescript area a few miles east of downtown Austin. Critically, this environment highlighted what strides Lexus has made in the sport sedan race with its new IS.