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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-1 Limitless looks like a curvy crossover concept

Lexus released a teaser for a new concept that will make its debut at the 2018 Detroit Auto Show, and it has quite the name. The company calls it the LF-1 Limitless, a name that wouldn't sound out of place on a battleship. According to Lexus, the name was chosen because this concept "is a flagship crossover that redefines the boundaries of luxury." Frankly, the boundaries that make up the high-dollar crossover segment are definitely well-tread by now. What we can tell is that the concept's heavily raked D-pillar suggests it will have a coupe-inspired look similar to the BMW X6 and Mercedes-Benz GLC Coupe. The bodywork features many curvy lines and exaggerated wheel arches. It will be interesting if this LF-1 has flagship size to go with its flagship description, which would put it in competition with the upcoming Audi Q8. This concept is well-worth keeping an eye on, since Lexus has a history of previewing future production models with the LF moniker. Examples include 2009's LF-Ch that became the CT 200h, 2012's LF-LC coupe that became the LC 500, 2013's LF-NX that became the Lexus NX crossover, and 2015's LF-FC that became the new LS sedan. Not everything makes it to production, such as the LF-SA mini car, and the LF-C2 that suggested an RC convertible. But there's a strong enough history of production cars coming from LF concepts that this LF-1 could be the preview of a new production model. Related Video:

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: