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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.

Toyota Land Cruiser vs Lexus LX 570 Suspension Flex Test

There’s no need to explain the Toyota Land Cruiser, one of ToyotaÂ’s earliest successful products. The 2020 Toyota Land Cruiser Heritage Edition celebrates some 60 years of popularity of a vehicle that has survived the segmentÂ’s “mall wagon” phase and the rise of crossovers. Its already-sterling reputation has received an additional recent push from the rise of overlanding — an outdoor pastime that has always existed but only recently got a press agent. By comparison, the Lexus LX is a more recent development. Debuting in 1996, the LX 450 was little more than an 80-series Land Cruiser with cladding, a Lexus badge and a higher price. The amount of styling differentiation and luxury specialization has increased over the years to the point that the newest LX 570 actually seems like a completely different vehicle. In truth, the 2020 Lexus LX 570 and the 2020 Toyota Land Cruiser are both 200-series Land Cruisers under the skin. They share the same thirsty 5.7-liter V8 engine and the same frame that features a double-wishbone suspension at the front, a five-link coil spring suspension at the rear and a 112.2-inch wheelbase in the middle. The styling is strikingly different, of course, but so are the hidden details of their suspensions. The Land Cruiser employs a simple set of coil springs and shock absorbers, but with an interconnected pair of automatically disconnecting stabilizer bars called KDSS (Kinetic Dynamic Suspension System). The Lexus, on the other hand, has fixed stabilizer bars and coil springs, but its “shocks” are really hydraulic cylinders that perform height adjustments and transmit suspension movements via piping to remote electronically-adjustable damper valves mounted along the frame rails. All of the above begs a question: Which of them will go farther up my RTI ramp and, by extension, offer better suspension articulation in an authentic off-road situation? Right away, the very approach to the ramp demonstrates a huge difference and a serious issue for the LX. Its normal cruising height (there is a lower height, but this isnÂ’t that) doesnÂ’t provide enough approach clearance to attempt the ramp. The front spoiler contacts the nasty grating before the tire does. ItÂ’s a close-run thing, but from this point on, clearance gets SMALLER as the left front suspension compresses on the way up. If it's touching now, itÂ’s only going to get worse if I go forward.

Lexus J201 Concept | Overlanding into uncharted brand terrain

Taking a left turn off of I-10 outside of Palm Springs, California, we drove down a rutted, sand-blown track for a couple miles before ending up at a tall, rocky pile, an outcrop scaled somewhere between a hillock and a massif. After shifting the transmission into neutral, engaging the four-wheel-drive low range, and closing the ARB Air Locking differentials, we got even and steady on the throttle and pointed our truck—a seven-figure, one-off, overlanding concept known as the Lexus J201—up the steep, rocky face until all that showed through the windshield was dust and searing sky. The truck handled the challenge with marked aplomb, cresting the ridge without a huff, and eventually leveling off and displaying the glories of what was on the other side: a meth lab. So capable was this vehicle that it was easy to forget that the platform that underpinned all of this ruggedness was LexusÂ’ posh, flagship SUV, the $88,000 LX 570. This jacked and tracked truck begs the question: Has Lexus gone rogue? “Going rogue is actually part of who we are,” says Vinay Shahani, the brandÂ’s vice president of marketing for America. “And we love to experiment. J201 is a rolling example of our belief in Always On, the idea of continual improvement no matter the time in a vehicleÂ’s lifecycle.” The reference to time-in-lifecycle is kind of an understatement for a vehicle that has existed in its current form, with only minor cosmetic updates, since 2008 — two lifetimes in the product span of most automobiles. But the J201 Concept does add significant upgrades to the production vehicle, which, based as it is on the venerable and caprine Toyota Land Cruiser, is hardly a slouch in the off-road-capability department. In addition to the performance differentials mentioned above, the J201 benefits from a myriad of additional add-ons. These include rugged accessories such as an Icon Vehicle Dynamics suspension good for a few extra inches of ride height, and even more when the suspension is put in extreme high mode; smaller 17-inch Evo Corse Dakar Zero wheels mounted with 33-inch General Grabber X3 tires; a TJM Airtec snorkel for breathing underwater (something we did not get to experience in the parched Coachella Valley); and StopTech drilled brake rotors. It also includes bolt-ons such as CBI skid plates, rock sliders, and front and rear bumpers; a Warn winch; a Prinsu Design roof rack system; an onboard ARB twin compressor; and luminescence of Rigid Industries light bars.