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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 LS sedan will be quieter, more comfortable and smarter

Lexus made numerous updates to the LS in a bid to turn it into an even more comfortable cruiser. Unveiled online, the redesigned model gains a quieter cabin, new driving aids, and a handful of minor styling tweaks. Engineers turned their attention to parts of the fifth-generation LS that a majority of owners never think about in order to achieve a ride that's markedly quieter and smoother. They notably fitted a new solenoid to the adaptive suspension that reduces damping force, redesigned the motor mounts to prevent mechanical vibrations from entering the cabin, and changed the stiffness of the run-flat tires as well as the rigidity of the stabilizer bars. These changes come together to cement the sedan's positioning as the cushiest model in its category. Deeper stitch points and seat pads made with low-resilience urethane further enhance comfort, according to Lexus, but the biggest upgrades found inside are technology-related. The LS receives a digital rear-view mirror as well as a 12.3-inch touchscreen compatible with Android Auto and Apple CarPlay. Users can also control the display screen and audio functions using their phone once they've paired it to the infotainment system. LS buyers in select markets will be able to order the company's Teammate technology. It's a semi-automated suite of driving aids that bundles lane-keeping assist and adaptive cruise control while allowing the car to change lanes and pass slower vehicles. It does not turn the LS into an autonomous car; it merely helps motorists when driving becomes tedious. The system can only be used when the right conditions are met, and Lexus hasn't announced plans to offer it in the United States. The latest generation of park assist technology is available, too. The visual changes are relatively subtle. Up front, stylists redesigned the lights and gave the bumper a new look. Out back, eagle-eyed car spotters will notice the lights and the lower bumper have been slightly revised. It's the same story inside, where the most noteworthy change is the addition of the aforementioned touchscreen. Lexus expanded the color palette with a shade of silver named Gin-ei Luster that stands out with a smooth, mirror-like finish.

Lexus LS 500 Inspiration Series is a limited extra-luxe edition of the flagship sedan

Lexus is continuing its trend of making its “Inspiration Series” of cars, and the latest model to get the treatment is the LS 500. Just like all the others before it, this one is mainly an appearance package meant to set it apart from other LS 500s on the road.  The first unique touch is its Deep Garnet paint that isnÂ’t available on the normal LS 500. Then you get 20-inch black chrome wheels that go quite nicely with the paint color. Lexus didnÂ’t forget the Inspiration Series interior, either. Standard is the ultra-luxe Kiriko glass trim you can get as an option on the regular LS 500. It looked stunning on that car, and itÂ’s going to look great combined with the white leather seats on this one, too. Lexus is also giving the Inspiration Series blue LED dash lighting and “Lexus” puddle lamps below the doors. There are only going to be 300 LS 500 Inspiration Series cars sold in America, and theyÂ’re going to be available to buy this fall. Mechanically, itÂ’s exactly the same as a regular LS 500 with the 3.5-liter twin-turbo V6 making 416 horsepower and 442 pound-feet of torque. As for pricing on this limited-edition model, Lexus isnÂ’t saying quite yet. A regular LS 500 similarly equipped is around the $100,000 mark, so look out for something in that range when we do get a price. Related Video: