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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.

The new 2018 Lexus LS 500h hybrid V6 makes V8 power

With hybrids en vogue in Geneva, Lexus has taken the opportunity to debut the all-new 2018 Lexus LS 500h. The V6 is paired to two electric motors for a healthy total of 354 horsepower, just not far off the a V8-powered LS 460. It is down quite a bit from the outgoing 438-horsepower LS 600h but still enough to send the LS 500h to 60 miles per hour in 5.4 seconds. The hybrid system is similar to the one in the new LC 500h coupe, which combines the traditional Toyota hybrid two-motor CVT with a 4-speed automatic for better responsiveness, less of the "rubber band" CVT sensation, and (of course) greater efficiency. It should also help keep the LS 500h relatively quiet at full bore, keeping it in line with the "whisper quiet" mantra of the new LS. The new lithium-ion battery pack is 20 percent smaller than the outgoing nickel-metal battery, though Lexus claims power density has been improved. Styling changes to the hybrid are minor. It still features the love-it-or-hate-it spindle grille that's permeated throughout the Lexus lineup, but other than a handful of hybrid badges and the typical blue ring around the badge, it's hard to spot the difference between the models. The interior appears to have a few minor trim changes, including some new reptile scale-like door panels. While fuel economy hasn't been announced, expect improvements over the outgoing model's 19 city/23 highway rating. Look for more news on fuel economy and pricing in the next few months. Related Video: