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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 finally announces all-new twin-turbo V8, will race the Nurburgring 24H

In March 2013, Motor Trend wrote about rumors of Lexus bolting two turbos onto the high-revving, atmospheric 5.0-liter V8 in the RC F, the new engine for eventual use in an LC F super coupe. We heard the rumor again from multiple directions in 2017, and again in 2018. At last, the rumor gets official confirmation as an aside in a Lexus press release about taking the Gazoo Racing LC race car to the Nurburgring 24-hour for a third time next year. After two years of "unavoidable hours in the pit to resolve issues" with the LC in 2018 and 2019, the luxury carmaker said that next year it "[aims] to complete the race without any trouble by adopting a variety of new technologies, including a newly-developed V8 twin-turbo engine destined for use on future road cars such as sports cars." That's all we know for certain about what's coming. Predictions supposed Lexus has paired two of its 2.0-liter, four-cylinder engines with a 90-degree angle to create the 4.0-liter twin-turbo V8. Estimates over the years guessed output as anywhere from 600 metric horsepower, 592 of our U.S. customary horses, to 620 hp, to 660 hp. The guesstimate torque figure comes in at "up to 506 pound-feet," arrived at by a Japanese magazine that figured Lexus was trying to outdo the Nissan GT-R. What's safe to say is that the engine – created with an emphasis on performance – will outdo the 471 hp and 398 lb-ft of torque from the Yamaha-developed, naturally-aspirated V8 currently powering the LC 500 flagship. The new engine might not outdo the 7,300-rpm redline. Since the press release mentioned "sports cars," plural, there's every right to expect the hi-po power plant to migrate to other offerings. In the press, the engine's been mooted for everything from the RC F and new GS F to an LS F and a super-potent SUV inspired by the LF-1 Limitless concept that would take on the Lamborghini Urus. Further changes to the LC F accompanying the new motor could include a great deal more carbon fiber, about 200 pounds trimmed from the curb weight, a stiffer structure, a "low-weight and high-rigidity suspension," and more refined software systems for tech like driver aids, traction control, and anti-lock braking.  Lexus will take the start line at next yearÂ’s Nurburgring 24-Hour weekend from May 21-24 in the SP-Pro class. Related Video:

Pontiac Aztek enjoys rebirth thanks to Millennials

Apparently, Millennials – those between 18 and 34 – aren't afraid to look different on the road, and they like performance, too. A new study by Edmunds is discovering some surprising vehicle choices by this group. Among them, the long-derided Pontiac Aztek is getting a new day in the sun with 25.5 percent its buyers coming from this generation in the first half of 2015. For comparison, Millennials represent an average of 16.8 percent of used car purchases. The Aztek is slowly shaking its reputation as a styling abomination, which seems tied to its appearance on Breaking Bad. The show premiered in 2008, and the Pontiac has been on this list for four of the past five years, according to Edmunds. It even led the pack in 2010. A recent Retro Review from MotorWeek also showed that the crossover wasn't always so hated. While it's still a shock to see the Aztek on any popularity list, the awkward-looking crossover only ranks sixth among Millennials. The vehicle with the biggest portion of buyers from the generation is the Dodge Magnum with 27.6 percent. According to Edmunds, the bluntly styled wagon is especially popular in Detroit and Chicago. The Chrysler Pacifica comes in a close second at 27.3 percent. When it comes to used cars, value and utility appear to trump just about anything else for many Millennial buyers," Edmunds analyst Jeremy Acevedo said in the report. Young buyers aren't afraid of sporty rides, either. The Subaru WRX has 26.4 percent Millennial buyers to rank third place on the list, and the Volkswagen R32 takes fifth at 25.7 percent. Just a few points lower in seventh place is the Nissan GT-R at 25.4 percent, and the final performance machine in 10th place is the Lexus IS-F with 24.7 percent. Related Video: