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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.

2020 Lexus RC F adds hardcore Track Edition and lots of carbon fiber

There's a shortage of high-performance naturally aspirated V8 engines in the United States these days. Fortunately, Lexus sees fit to keep its 5.0-liter V8 in production for the foreseeable future, updating it for 2020 and packaging it inside a revised RC F sports coupe. In its latest guise, the 5.0 spins out 472 horsepower and 395 pound-feet of torque, increases of 5 ponies and 6 lb-ft over the previous version. The RC F gets slightly revised styling for 2020 that includes minor updates to the headlights, taillights, and front and rear fascias. Underneath the skin, the coupe benefits from hollow half shafts, aluminum suspension bits, a lightened intake manifold, and a smaller air conditioning compressor all in a bid to save weight. Custom Michelin Pilot Sport 4S tires, a numerically higher rear axle ratio and the addition of a simple launch control system – press the brake, floor the gas, drop the brake – allows the 2020 RC F to hit 60 miles per hour in 4.2 seconds. 2020 Lexus RC F Track Edition View 30 Photos The biggest change for the RC F is the addition of a Track Edition for 2020. It's immediately recognizable by its massive carbon fiber rear wing and lower front spoiler. That fixed rear wing is lighter than the active spoiler of the standard RC F while simultaneously adding up to 58 more pounds of downforce and reducing drag. The hood, roof, rear-seat partition, and a bumper reinforcement are also made from carbon fiber. Other lightweighting bits include a titanium muffler and tailpipes, carbon ceramic brake rotors from Brembo, and 19-inch forged wheels from BBS. It all adds up to a 176-pound weight loss compared to the current RC F. Although the engine is unchanged from other 2020 RC F models, the weight reduction drops the 0-60 time down to 3.96 seconds. We don't yet have pricing for the 2020 RC F or the upgraded Track Edition, but Lexus says production will begin in the second quarter of 2019. Check out both versions of the 2020 RC F in our high-res image galleries above. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Lexus RX replacement to debut in Detroit?

The 2015 Detroit Auto Show is shaping up to be a big one for Lexus, with Group Vice President Jeff Bracken confirming to Ward's Auto that the Japanese luxury marque will have at least one, and possibly two, all-new-model introductions. Ward's seems to think that one of those vehicles will be the new RX crossover, one of the brand's most popular (and oldest) offerings. The complete and utter lack of spy photos of the new RX doesn't necessarily support Ward's argument, although if the new CUV ends up being based on the JDM Toyota Harrier, as previously reported, the absence of camouflaged images might make some sense. As for that other vehicle, it's hard to say what we might see. Were we to put our money on it, though, the long-awaited GS F would be a strong contender for a Detroit debut. The high-performance challenger to the BMW M5 and Mercedes-Benz E63 AMG has been spotted almost completely undisguised as recently as October. On top of that, Detroit's reputation as a performance-focused show (last year's show saw debuts of the Ford Mustang, BMW M3 and M4, Chevrolet Corvette Z06, Volkswagen Golf R and Porsche 911 Targa) makes the GS F's appearance there a fair bet. One thing we can count on at least hearing about when Detroit rolls around is Lexus' strong sales position. The company's 2014 sales should crest 305,000 units by the end of the year, marking the first time the company had passed the 300,000-unit mark since 2007. Bracken told Ward's that should be an easy task, particularly with the brand's "best month of the year," December, still to come.