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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 teases Detroit-bound F Performance Coupe... again

A few weeks ago, Lexus released a teaser image of its upcoming Detroit Auto Show reveal, simply calling it the "next Lexus F." Now, a new shot of the Detroit-bound car has been sent out, and while we still don't know what the new model will be called, we can tell you this: it's a coupe.
Originally, we assumed the new Lexus F model would be the successor to the IS F sedan. But now that we know it'll be a two-door, it stands to reason that this could be the performance oriented version of the 2015 RC coupe that made its debut at the Tokyo Motor Show earlier this year. Of course, Lexus is still keeping quiet on any specifics, simply stating that the company "will unleash its upcoming F model as a coupe, conceived with grit, an entirely new expression of design and uncompromising performance."
The official name of the new F model is set to be revealed in early January, likely just before its official debut in Detroit. Stay tuned for more, and scroll down to read Lexus' very brief press blast.

Lexus postpones 2021 IS debut indefinitely

The new 2021 Lexus IS sports sedan was scheduled to make its debut today, but Lexus has made the decision to postpone the digital unveiling indefinitely. Lexus cites respect for "the recent global situation" as the reasoning for the postponement.  This week, Lexus released a simple statement on the digital debut of the 2021 IS. "Considering the recent global situation, Lexus has respectfully postponed the premier of the new IS, which was originally scheduled for 8:00 a.m. Japan Standard Time, June 10," it said. "Revised timing will be announced soon." With worldwide outpouring of civil protests in regards to the death of George Floyd, police brutality and the movement for police reform — all in the midst of a pandemic — it seems like a malapropos time to unveil a new car. Autoblog reached out to Lexus for further clarification on when the car would debut, and the company said it hopes to have more news at a later date. When it does debut, the next-generation sports sedan will utilize rear-wheel drive, and we expect all-wheel drive to be an option. According to a report from Motor Trend, the new IS will ride on an evolutionary modified version of its current "New N" platform, as opposed to an all-new setup, but that is unconfirmed. Like the current IS, the upcoming IS will likely offer both four-cylinder and six-cylinder powertrains options, though it is unclear what the power will look like. Related Video: