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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 amalgamates motorsports divisions under Gazoo Racing

Toyota has more racing divisions than we could wave a checkered flag at, with the company's various motorsport activities all coordinated by different operations. But the Japanese industrial giant is now bringing most (if not all) of them under one roof. From here on in, any racing that was done under the Toyota Racing, Lexus Racing or Gazoo Racing banners will now be united under the latter. That includes the LFAs it races around the Nurburgring, the TS040 Hybrid it fields at Le Mans and in the World Endurance Championship, the Yaris it will soon throw at the World Rally Championship, the Lexus racers that compete in the Super GT championship back in Japan... the works. The move does not appear to affect Toyota Racing Development, the automaker's American arm that handles its NASCAR racing activities, but from here on out, any Toyota or Lexus you see racing on most anything but a speedway will be competing under Gazoo Racing. The move appears to be more than symbolic and semantic, putting its racing vehicle development, technical support and marketing activities in the hands of the new Motor Sports Group. In announcing the consolidation, Toyota highlights in particular the benefit its various racing programs bring to its talent pool, if not the direct effect they have on the company's vehicles themselves. Toyota Racing, Lexus Racing and GAZOO Racing Unite Under GAZOO Racing Toyota City, Japan, April 9, 2015-Starting April 11, Toyota will unite all motorsports activities under GAZOO Racing. The move will clarify the role of Toyota's motorsports in its efforts to make ever-better cars and foster new generations of car enthusiasts. Until now, Toyota has participated in competitions around the world-including the World Endurance Championship (WEC), the Super GT in Japan, and the Nurburgring 24 Hours endurance race-through the separate Toyota Racing, Lexus Racing and GAZOO Racing teams. Of those, GAZOO Racing in particular was created to expand the role of promoting motorsports beyond that of traditional automakers, and carry out grassroots activities aimed at creating new and ever-growing generations of car enthusiasts. Concerning today's announcement, Toyota President Akio Toyoda said: "Our founder Kiichiro Toyoda once said that motorsports are vital to the evolution of car making and the entire auto industry.

Toyota shows a smoother autonomous Lexus for CES

Toyota is bringing a new research vehicle to CES. The TRI-P4 autonomous driving test vehicle, based on the Lexus LS500h, is a major step ahead, according to Toyota, as it has improved computing power and additional cameras for better reaction times. Earlier test mules have also used the LS as a basis, and the shift to the new, fifth generation LS brings chassis and steering-control benefits, so the vehicle's movements are smoother in automated mode. The camera tech has also been better integrated into the vehicle design, courtesy of CALTY in Ann Arbor, Michigan. Development has been swift, as the TRI's P2.1 car was unveiled in 2017. The P4 car will be used for Toyota Research Institute's Guardian and Chauffeur mode development. The two tiers differ somewhat, as TRI's Ryan Eustice explains: "Our Chauffeur development is focused on full autonomy, where the human is essentially removed from the driving equation, either completely in all environments, or within a restricted driving domain. Guardian, on the other hand, is being designed to amplify human performance behind the wheel, not replace it. The introduction of the new P4 platform will help us accelerate the development of both tracks when it joins our fleet this spring." The vehicle's situational awareness is boosted by two extra cameras facing on the sides, and a new imaging sensor both forward and rearward. Toyota says the P4's lidar setup is a carryover from the previous platform, but that its machine learning is much improved by its more powerful computer setup. The electricity required by the P4's computing power also comes from the hybrid battery, and as the computer "brain" is now housed vertically against the rear seat's backing, actual trunk space has been freed. More LS500hs will begin to be modified into TRI-P4 vehicles during spring 2019. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.