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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 LF-LC approved for production

On the sidelines of a press drive for the 2014 Lexus IS, the company's vice president of marketing in the US told Ward's Auto that the honchos in Japan have approved the Lexus LF-LC concept for production. He wouldn't offer any other details on how the luxury coupe might be transformed into a vehicle for the buying masses, and that has led to a bag full of speculation.
The show car was hybrid-powered and rear-wheel drive, a beautifully executed stab by Toyota designers in Newport Beach at redefining Lexus, but even with the concept, the point was to keep it "within reach for premium buyers." The report says the odds are on limited production and higher pricing than Lexus' "mainstream products," and other sites have speculated on what kind of powertrain it might end up in showrooms with.
GT Channel posits that the LF-LC will be the inspiration for a coupe in the Lexus LS price bracket with a choice of either the 4.2-liter V8 or the hybrid powertrain from the LS 600h, further speculating it will be called LC 550 and cost more than $100,000. It then says that there would be another coupe created beneath that one to replace the SC 430. Lexus Enthusiast, however, calls those "warmed-over rumors" and says that the marque probably won't deviate from its engine-capacity-naming scheme - labeling a car with a 4.2-liter V8 an LC 550. Nor does it think Lexus will use the letters LC after the company has trademarked "RC" in the US and Australia.

Toyota, Lexus will offer low-cost automated braking system

First, a technology gets better, then it gets a lot better, then it gets less expensive, then it gets a lot less expensive. Advanced driver safety and convenience systems are about to make that last step thanks to Toyota. Centered around a pre-collision braking system, there will be three suites of driver aids known as Toyota Safety Sense C (TSS C) for compact cars, Toyota Safety Sense P (TSS P) for midsized and premium cars, and Lexus Safety System+ (LSS+) for the luxury brand. TSS C pairs a camera with laser radar to provide a pre-collision system that prompts the driver to brake if it detects an impending accident, and can supply additional braking force and automatically brake between seven and fifty miles per hour. There are also Lane Departure Alert and Automatic High Beam. TSS P pairs a camera with more precise millimeter-wave radar. Starting with the three functions in TSS C, it adds pedestrian pre-collision capability and adaptive cruise control. This one will be available first, coming on the new RAV4 Hybrid and Avalon. TSS - either C or P - will expand to three more vehicles by the end of the year. The wallop is in the price: TSS C will be a $300 option, TSS P will cost $500. Compare the Ford Fusion SE, for instance - it's Driver Assistance Package comes with Lane Departure Warning, Automatic High Beams, it has Lane Keep Assist, Blind Spot and Cross Traffic Detection that neither TSS has, but doesn't have any autonomous braking feature. It costs $1,200, but requires you to add the Technology and Luxury Packages for a total price of $3,165. If you want Autonomous Cruise Control, that's another $995, for $4,160 in total. Instead of $300 or $500 on the Toyota. Lexus' LSS+ will come first on the new RX then spread to four more models by the end of this year, and cost between $500 and $635 to add as an option. It also uses a camera and millimeter-wave radar for its vehicle and pedestrian pre-collision system, lane departure warning and lane keep assist, automatic high beam, and auto cruise control. The similar package on a BMW X5, with no pedestrian component, is $1,200. Toyota says both safety suites will eventually be on "nearly all" of it products and all trim levels by the end of 2017.