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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 and Scott Pruett go racing with RC F GT3

Lexus will show what its RC F GT3 can do next year in the US when the racer will be hit the track with a newly formed team called F Performance Racing. Unfortunately, no one will say what series the coupe will compete in, but veteran racer Scott Pruett will be behind the wheel. As Lexus already teased, the RC F GT3 will feature a body with big flares and a huge wing. Under the heat extractors in the hood, there will be a production-derived 5.0-liter V8 with over 500 horsepower that will route through a six-speed sequential gearbox. Based on its current livery in eye-popping metallic blue, the coupe will also be one of the easiest cars to spot on the track. The sharply styled RC F might take too many checkered flags in its first season, though, because the team will keep the coupe to a limited schedule next year. Rather than scoring wins, the focus will be on developing the platform and gaining experience. However by the 2017 or 2018 season, there will be a multi-car effort with a full racing calendar. When taking on veteran teams fielding Porsches or Ferraris in the same class, a seasoned driver like Pruett will be an asset around a racecourse. He also already has close ties to the Japanese luxury brand after competing in Lexus-power prototypes in the Grand-Am Rolex Sports Car Championship Series and helping to develop the LFA. "I could not be more ecstatic to be representing Lexus as a performance brand ambassador and on the track in the F Performance RC F GT3," he said in the announcement. We look forward to seeing what he can do with it next year. Related Video: Lexus Partners with F Performance Racing for 2016 and Beyond Scott Pruett and Paul Gentilozzi form new team Multi-year team agreement Upcoming season focuses on vehicle development LAS VEGAS (Nov. 2, 2015) - Lexus today announced its motorsports partnership with Paul Gentilozzi and newly formed F Performance Racing to field the RC F GT3 in a soon to be announced sports car series. This new racing venture is part of the Lexus' global motorsports effort that will see the Japanese luxury brand competing on tracks in the United States beginning in 2016. The new race vehicle is based upon the production Lexus RC F high performance coupe that went on sale at the end of 2014.

Lexus LC Coupe and Convertible add a bevy of official TRD parts

TRD stands for Toyota Racing Development, but that doesn’t stop the performance division from developing parts for Lexus products, too. One of those Lexus products it just released a set of performance parts for is the LC 500. The two-door coupe is our favorite Lexus for sale right now because of its excellent driving dynamics and stunning looks, so adding more performance is a good thing, right? WeÂ’ll stop short of saying itÂ’s a great thing for appearances in this particular instance. The parts shown here tend to muss up and clutter the LC's otherwise gorgeous design. That large rear wing, aero cowling above the rear seats and aero mirror cover all notch the aggressiveness up a level, but it makes the styling look a bit messier in photos. TRD does claim real performance gains from the parts, though. The modified side skirts reduce the amount of wind flowing to the rear tires, which makes the car slipperier through the air — TRD also claims a benefit in fuel economy and reduced wind noise. There are three new wheel designs, all offering a reduction in weight over the stock wheels and an improvement in rigidity. The wheels pictured on the car are the Lunanium Gun Metallic option. TRD says the giant aero cowl reduces wind noise in the cabin for the LC Convertible, and the big rear wing improves vehicle stability. Other available parts include a front spoiler (adds downforce, lowers front clearance by 30 mm), rear diffuser (adds moderate downforce, says TRD), smaller rear spoiler (improves stability at speed), and a “performance damper.” Details are short on this damper, but we can assume itÂ’s slightly stiffer than stock and could offer a noticeable handling improvement. ThereÂ’s a 3-D mini configurator you can play around with on TRDÂ’s site, too. You can only choose between the exterior color, interior color and aero cowl cover, but itÂ’s worth it to see what the mods might look like on your particular LC. Interestingly, the aero cowl sitting above the rear seats can be had in either black or white. Availability of the parts in the U.S. is still unclear, but weÂ’re reaching out to TRD and will update with any news we might hear.  Related video: