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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.

Growing demand could bring more body-on-frame off-roaders to the Lexus range

Car-based crossovers are outselling truck-derived SUVs by a wide margin, but Lexus still sees a strong demand for models that offer true off-road capability. It hinted that it could soon increase its presence in this segment. Toyota's luxury division entered 2021 with two body-on-frame SUVs in its range: the Land Cruiser-based LX (pictured) and the smaller, more affordable GX. Neither is a high-volume model, but both fared shockingly well in 2020. LX sales in the United States fell by 4.4% to 4,512 units, which is a great result in a year when double-digit declines were common, and GX sales increased by 9.9% to 28,519 units. Clearly, off-roaders are in demand. "What we have seen at Toyota is that there's so much of an appetite for [off-roading] that I see that [moving into] the Lexus brand as well. There is an appetite, a customer desire, a customer push to see all brands giving them more options. I think it would be silly for Lexus not to travel down that path," explained Jack Hollis, the head of automotive operations for Toyota's North American division, in an interview with Automotive News. He added that his team has identified a "white space" in the Lexus range that could be filled with an additional body-on-frame off-roader. He didn't reveal precisely what he has in mind, but there are a few possibilities we can rule out. We know Toyota is wrapping up the development of the next-generation Land Cruiser, even if the SUV might not be sold in America, and seeing a next-generation LX seems like a given, but we don't think that's what Hollis was referring to. Moving into the space above the LX with an even bigger truck is highly unlikely. Similarly, the idea of a Lexus-badged SUV aimed at the Jeep Wrangler and the Ford Bronco is neat but unrealistic. Ford's hotly-anticipated born-again off-roader has captured the attention of executives, however. "Holy cow! They sold out that thing, and I think there's a strong market out there for authentic off-road chops and credibility. We're seeing that with [the Toyota] 4Runner as well. I don't think it's any secret that [the 4Runner] is not all that new, but it continues to set records, and it continues to grow volume," pointed out Lexus brand head Andrew Gilleland in a separate interview with Automotive News. Could we see a Lexus-specific version of the 4Runner? We certainly wouldn't rule it out, especially because making an upmarket variant of the SUV would help Toyota leverage the benefits of economies of scale.

Lexus LC convertible confirmed for production

The rumors were true, the Lexus LC convertible is going into production, and we got our first look at the production model at the Goodwood Festival of Speed. Unfortunately, our first look at the production car is of a camouflaged example. The good news is that it looks pretty much just like the concept that was shown in full at this year's Detroit Auto Show. And that car looks just like the coupe minus a roof, and the coupe is a stunner. Lexus didn't reveal any other details about the production LC convertible. It didn't even give a specific date, only saying it will "go into production in the near future." We're assuming the only major mechanical changes will have to do with the roof and chassis, meaning it will have the same powertrains as the coupe. Those include a sumptuous naturally aspirated 5.0-liter V8 making 471 horsepower and 398 pound-feet of torque and a hybrid V6 making 354 horsepower. The V8 and its 10-speed automatic sounds amazing, as you can see in the video below, and the hybrid is paired with a fascinating transmission that earned it our 2018 Tech of the Year award.