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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 flagship spotted testing in the desert

Most of the Lexus line-up has been updated with the company's unique design language. Whether you love it or hate it, most of the company's cars are impossible to confuse for something else. But during this time of transformation, the flagship LS sedan has lingered with a very mild, sedate shape. These spy photos show the LS has gone under the knife. That being said, we can't really say how different the LS is going to look for sure because Lexus has employed some impressive camouflage. If we didn't know better we'd say it looks like the LS is going retro with round reflector headlights and some rear tailfins. But we do know better, so don't look for those features to make it to the production model. What we can make out is the lower half of the Lexus "spindle" grille. The camouflage wrapping is pressed up against a trapezoidal shape at the front reminiscent of what we've seen on other Lexus models. It looks like a large version of it as well. This Lexus seems to still be quite long, and based on where the rear passenger is in the photos, it still seems to have loads of space for rear passengers. It's difficult to tell if this is a long wheelbase model or a standard one, but if it is long wheelbase, it's proportioned quite nicely. It looks like there will be quite a large C-pillar on this LS too. Our spy photographer expects this car to be revealed next year as a 2018 model available with a V8 and possibly a hydrogen powertrain. So if you want one of the last low-key LS models, you'll want to get the current version because its days are numbered. Related Video:

Toyota announces two recalls affecting 1M Corolla, Matrix and Lexus IS models

The recall bug strikes Toyota again. The automaker has issued a voluntary recall of three models that, in total, represent more than one million units. Around 752,000 2003-2004 Toyota Corolla and Matrix models are being recalled for airbag concerns, while a windshield wiper issue is causing the recall for close to 270,000 Lexus IS sedans from the 2006-2012 model years.
Completely unrelated to the small airbag-related recall issued earlier in the week, the Corolla and Matrix recall is caused by a faulty airbag control module that could potentially short circuit, which could lead to the front airbags or seat belt pretensioners deploying. The Lexus recall is due to a wiper arm nut that wasn't tightened properly, which can cause the wipers to not work when trying to clear heavy buildup such as snow.
Scroll down for a press release that includes more information, as well as details about how owners can contact the manufacturer directly.