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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 #339

Farewell, Zach Bowman; Pikes Peak 2013; Datsun; 2014 Ram lineup
Episode #339 of the Autoblog Podcast is here, and it's the last rodeo for Zach Bowman before he departs for other pastures. The crew this week consists of Dan Roth, Zach Bowman and Jeff Ross, who talk about the astounding records set at this year's Pike's Peak hill climb, the return of the Datsun brand name and the recently-announced 2014 Ram truck lineup. Of course, we start with the garage and end with your questions and comments. For those of you who hung with us live on our UStream channel, thanks for taking the time. You can follow along after the jump with our Q&A. Thanks for listening!
Autoblog Podcast #339:

Lexus GX and LX future may be in doubt

With the debut of an all-new RX, Lexus is in a position for continued strong sales in the luxury SUV arena. The fourth-generation RX has grown, making room for the new NX model beneath it. But further up the ladder, things could change for the GX and LX. In an interview with Autoblog at the 2015 New York Auto Show, Lexus executive vice president Mark Templin gave some hints at the future of his brand's SUV lineup. "With NX and RX, we have a really good one-two punch in the crossover segments, and we think we can cover most of the markets with that," he said. As for the larger, three-row GX and LX models, which are built on a traditional ladder-frame chassis, things aren't so clear. Templin noted the the success of both models all over the world – the LX is the best-selling Lexus in Saudi Arabia. The same is true for sales here, he said: "We do very well with those products in the United States – GX has been a great product for us in the US for the last couple of years since its initial introduction. But the future of those vehicles longer term is in doubt because of regulations that are being driven by governments all over the world." Don't start stockpiling LX 570s in anticipation of shortages just yet. Templin didn't give any specifics; he just notes that tightening fuel economy and emissions regulations could affect product planning. In our analysis, if and when GX rides off into the sunset, Lexus still needs a midsize, three-row SUV to fill that gap. The most likely candidate for that is some variation on the RX. Whether or not that's the case, don't expect a BMW-like proliferation of body styles from Toyota's luxury division. "It creates problems. It creates complexity, that's hard for every step of the process," Templin said, nothing that too many models stresses the design department, manufacturing, and even dealers inventory selection. As for the bottom end of the lineup, Templin wouldn't comment on a compact SUV below the NX, saying "I think there are more potential options for us in the future, but we're not trying to grow the number of models we have in our lineup. It's not really what our core business is about." For now, Lexus and Templin are focused on launching the RX, which accounts for three of every 10 Lexus models ever sold. The 2016 model, available in RX 350 and RX 450h hybrid versions, goes on sale by the end of the year. Related Video: