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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 crafts working IS sedan out of cardboard [w/video]

People make model cars out of all sorts of material: wood, plastic, metal... and sure, even cardboard. What sets this one apart is that it's built to scale – as in, full scale – and what's more is that it can actually be driven. Then again, we couldn't vouch for its crashworthiness, so that might not be advisable. The replica Lexus IS sedan was commissioned by the Japanese automaker's UK office and made by two British workshops: Scales & Models and LaserCut Works. It's inspired by the Japanese art of origami and made out of cardboard, except for the working parts and the frame made of steel and aluminum. It's got a fully functional interior, opening doors, working headlights, rolling wheels, and an electric motor. The form is made up of cardboard 10 millimeters (0.4 inches) thick, provided by packaging company DS Smith. The material was laser-cut into 1,700 components, according to a 3D digital model provided by Lexus, and assembled by hand and painstakingly fixed into place by water-based wood glue that has to set for 10 minutes between each step. Little wonder that the whole project took three months to complete. The finished product will be on display at the NEC in Birmingham later this week during the Grand Designs Live Show. But if you're not planning on heading there yourself, you can check it out in the image gallery above and making-of video below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. 05 Oct 2015 LEXUS UK UNVEILS FULL-SIZE ORIGAMI INSPIRED CAR REPLICA IS MODEL CELEBRATES LEXUS CRAFTSMANSHIP • Created as a celebration of the skills of Lexus's takumi craftsmen and women, capturing the spirit of Creating Amazing in design and engineering • Life-size replica of the Lexus IS, crafted from 1,700 fully recyclable laser-cut cardboard sheets • Created by a five-strong team of professional designers and modellers from UK specialist companies LaserCut Works and Scales and Models, supported by DS Smith (cardboard manufacturers) • Powered by an electric motor, the Origami Car can be driven Brussels, Belgium - There has never been a Lexus like it: sheet metal, glass and plastics have been set aside for the creation of a one-off life-size model crafted in precision-cut cardboard. The remarkable Lexus Origami Car is a faithful replica of the new IS saloon, produced as a celebration of the human craftsmanship skills that go into every car Lexus makes.

The Lexus LC 500h has a four-speed auto and that's a good thing

Lexus is sharing some powertrain details on the LC 500h ahead of the big hybrid coupe's debut in Geneva. Its new gas-electric setup strays from Toyota's tried-and-true system found in everything from the Prius to the Lexus GS. It's called the Multi Stage Hybrid System that's designed for performance vehicles, and it has an antiquated-sounding piece of equipment buried deep inside that's supposed to make it more enjoyable to drive. The basics: In the LC 500h, its first application, the Multi Stage Hybrid System will consist of a 3.5-liter V6, a hybrid transmission, and a lithium-ion battery pack. The hybrid transmission has an electric motor for motivation (and we're guessing a second for charging) and a four-speed automatic mounted to its rear, which either means inside or aft and in series. Why add ancient tech to a new hybrid system? Lexus says it preserves the connection between throttle input and engine speed that gets lost in a CVT. And while four seems like an insignificant sum in the face of nine- and 10-speed autos, remember that it is an infinite increase in gear count compared to CVT-packing hybrids. Toyota has been using versions of the Hybrid Synergy Drive system since the first Prius debuted in 1997, and the same system is sold under the Lexus Hybrid Drive banner in most of the luxury brand's offerings. These systems use what Toyota calls an e-CVT – two electric motors paired with a planetary gearset. This lets the engine and electric motors share the job of propelling the car – one motor handles charging of the battery and the other is primarily used to drive the wheels but can also recoup energy through regen. Like a conventional CVT, the planetary gearset arrangement allows the gas engine to run at its optimal engine speed when called upon for motivation and/or charging. But that doesn't make for the most exciting or familiar driving experience, as it affects both power delivery and the sound of the power being delivered. This is where the four-speed auto comes in. Based on the limited details Lexus has shared, our hunch is that the hybrid transmission will meld some form of the existing Lexus Hybrid Drive system with two more planetary gearsets, or the basic guts of a four-speed auto. This will provide the four fixed ratios and the feeling of actual shifting gears – because there will be actual gears shifting.