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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 may put Mirai hydrogen fuel cell powertrain into a Lexus

Toyota is hoping to define the world of hydrogen fuel cell vehicles with its uniquely styled Mirai sedan in a fashion similar to the way the Prius pops into people's minds when they think of a hybrid. The Japanese automaker believes it can sell about 700 FCEVs worldwide in the first year alone and build rapidly from there to an estimated 3,000 sales in the US by 2017. Of course, not everyone is completely enamored with the Mirai's design. Toyota is rumored to have an alternative in the works to quell some of those naysayers, possibly taking flagship form with a new Lexus LS powered by fuel-cell tech. The LS FCEV could be unveiled by 2017 to sit at the very top of brand's lineup. According to an inside source speaking to the Australian website Motoring, the front end would feature larger air intakes to cool the electrical components. The fuel cell would reportedly be positioned under the front seat, and the hydrogen tanks would be located under and behind the rear seat. Somehow, Motoring claims that all of this might be lighter than the current LS600hL hybrid, to the tune about 440 pounds. The model is also claimed to offer a range of about 239 miles, just a bit shy of the Mirai's roughly 300 miles. Assuming this vehicle actually exists, the cost for buyers of this flagship would almost certainly ring up at more than the LS600hL's $120,440 base price. Autoblog has reached out to Toyota for any further info about this rumor, one way or the other. If we hear back, we'll update this story with the details. Featured Gallery 2016 Toyota Mirai View 15 Photos News Source: MotoringImage Credit: Toyota Green Rumormill Lexus Toyota Alternative Fuels Hybrid Luxury Sedan lexus ls toyota mirai rumor fcev Lexus LS600h

Driving the 2021 Chevy Tahoe and Suburban and Lexus GX 460 | Podcast #656

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by News Editor Joel Stocksdale. They kick things off discussing the old-school body-on-frame SUVs they've been driving recently including the 2021 Chevy Tahoe and Suburban and the 2021 Lexus GX 460. After that, they talk about the continuation Bentley Blower and help a listener spend some money. Autoblog Podcast #656 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown What we're driving2021 Chevy Tahoe/Suburban 2021 Lexus GX 460 News: Bentley completes its first continuation Blower Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: