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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 jumps head first into turbocharging with its 2015 NX 200t

If Lexus is going to stay competitive, it needs to turbocharge sooner rather than later.
If there's anything that Lexus is experienced with, thanks in large part to its corporate parents at Toyota, it's hybrid powertrains. The automaker has hybridized tiny little four-cylinder engines, massive honkin' V8s and everything in between. So synonymous are hybrids and Lexus that it would be a shock to see a brand-new model released without an accompanying version with blue badging and a little "h" appendage to its name.

Lexus still weighing convertible prospects [w/poll]

Lexus dealers may be clamoring more for a three-row crossover than a two-door convertible, but as far as the automaker itself is concerned, the prospect of a droptop is not out of the question. In fact, according to the latest report from Automotive News, Lexus is currently considering two alternative proposals for adding a new convertible to its lineup. One would be based on the LF-C2 concept showcased at the LA Auto Show last month and take the form of an RC convertible, essentially taking the place of the outgoing IS Convertible at a relatively accessible market position. The other would essentially be a roadster version of the LF-LC sports car and take a much higher position in the company's lineup. Lexus is reportedly evaluating whether it can justify having both convertibles in its lineup – something it hasn't done since the IS and SC convertibles briefly overlapped in 2009-10. But considering the downwards slide in sales of IS Convertibles, it would be hard to make the business case for two new ones. So if sales of the IS Convertible have been so low, why make a new droptop altogether, you ask? A fair question, and the answer very well might come down to projecting a more youthful image and attracting younger buyers into Lexus showrooms – even if they don't ultimately buy a convertible at all. Lexus is well aware that its core customer base is aging, and is in no rush to alienate its more mature clientele, but if it's going to succeed in the long run, it's going to have to bring in younger customers. Have an opinion one way or the other? Voice it in the informal poll below.