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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.

Autoblog Podcast #318

Toyota back on top, Barrett Jackson, Crowdsourcing your Dodge Dart payments, Nissan and Toyota double down on pickups
Episode #318 of the Autoblog Podcast is here, and this week, Dan Roth, Zach Bowman and Michael Harley talk about Toyota regaining the No. 1 sales crown, getting your friends and family to buy you a Dodge Dart, Barrett-Jackson, and Toyota and Nissan remaining committed to their pickup trucs. We wrap with your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Keep reading for our Q&A module for you to scroll through and follow along, too. Thanks for listening!
Autoblog Podcast #318:

Lexus takes to Pikes Peak in RC F GT Concept

Lexus is gearing up to take on Pikes Peak with the RC F GT Concept you see here, developing the new racing prototype for the venerable hillclimb event. Different from the more extreme GT3 and GT500 racing concepts we've seen to date, the new GT concept is more closely based the road-going RC F. Only it's leaner and meaner and ready to take on the grueling 12.4-mile race to the clouds and all its 156 turns. The RC F GT packs the same 5.0-liter V8 and eight-speed automatic transmission as the production model. The major difference is that it weighs some 800 pounds less, thanks largely to the widespread use of carbon fiber body panels and polycarbonate windows. It also incorporates a more aggressive aero kit and rolling stock, and allows the technicians to tune the engine for competition applications. To tackle the Peak, Lexus is handing the keys over to none other than Justin Bell, the former GT2 class winner of the 24 Hours of Le Mans and the FIA GT Championship. He'll be fielding the RC F GT in the Time Attack class for production-based vehicles, while providing Lexus engineers with valuable performance data and the chance to develop components for future applications. Two years ago, the IS F CCS-R prototype competed in the same event, and served as a test bed to develop the powertrain that went into the RC F that followed. Related Video: LEXUS TO COMPETE IN 2015 PIKES PEAK INTERNATIONAL HILL CLIMB WITH ALL-NEW RC F GT CONCEPT - V8 Powered, Production Car-based Coupe to be Driven by Justin Bell - RC F GT Program to Serve as Key Developmental Tool for F brand Engineering June 22, 2015 TORRANCE, Calif. (June 22, 2015) – On June 28th, Lexus will compete in the Time Attack class of the Pikes Peak International Hill Climb. The luxury automaker will be campaigning the all-new RC F GT Concept, a vehicle that builds upon the legacy of the IS F CCS-R vehicles that last competed at Pikes Peak in 2013. This historic event, now in its 93rd running, is a race against the clock that tests man and machine with the changing elements, altitude, and a treacherous 12.42 mile, 156 turn course that winds up the peak from 9,390 feet up to the 14,115 foot summit. The new Lexus will be piloted up the mountain by British driving ace, 24 Hours of Le Mans winner, and automotive media personality Justin Bell. "With very little time behind the wheel, the RC F GT Concept has already proven fast and easy to drive, very much like the production models, actually.