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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.

Next Lexus RX previewed with JDM Toyota Harrier?

Japanese site CarWatch has revealed images of the next-generation Toyota Harrier, known to US and European buyers as the Lexus RX. The new model features a considerably more aggressive fascia in keeping with some of the latest Lexus design trends, while the back features a pair of wide, wraparound taillights.
The profile features a revised greenhouse, with a rather complex rear window treatment, while a subtle character line connects the front and rear taillights. According to the badging, the model shown features a hybrid powertrain, although there's little information on which engine is being used. We'd wager it's an evolution of the same 3.5-liter V6 hybrid found in the current RX450h.
This early look doesn't have a great deal of other info, and there are no images of the interior. We're not yet clear on how closely the North American RX will adhere to the Harrier seen here, but historically the two models have been quite close. That said, we'd expect a more prominent 'spindle' grille on the Lexus version than the baleen strainer on the vehicle shown here.

Lexus RC F Coupe puts on a brave face for Detroit

With less than a week to go until the 2015 Lexus RC F makes its debut at the Detroit Auto Show, Lexus has given us a sneak peek at its upcoming performance coupe. Earlier this week, Autoblog was granted were the opportunity for an intimate studio photo shoot with the RC F outside of the bright lights and big crowds sure to surround the coupe at Cobo Hall next week.
Compared to the hybrid version of the all-new RC we saw at the Tokyo Motor Show last year, the RC F has noticeably more aggressive styling. The cartoonishly oversized Lexus spindle grille gets a mesh insert pattern and is flanked by massive intakes in the lower fascia. To make room for what is expected to be a bigger V8 engine, the hood sits higher and is vented, but like many details about the RC F, Lexus is keeping the engine's size and output under wraps (although we have a sneaking suspicion it'll have 460 horsepower).
A trio of 19-inch wheel options will be available (including a set that is hand-polished), and the side sills and rear fascia have been modified for F duty. The biggest styling change on the RC F, however, is the LFA-inspired active rear wing that rises at speeds above 50 miles per hour for improved traction and stability. Carrying over cues from the current IS F, the RC F features air outlets behind the front wheel openings and angle-stacked exhaust outlets at the rear of the car.