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Volvo XC90 Coasting Transmission Deep Dive | How, when and why of coasting

In our recent 2021 Volvo XC90 Recharge review, its turbocharged-supercharged-hybridized powertrain delivered impressive horsepower and fuel economy. But Volvo has one additional trick up its sleeve, propelling a car with power that's simpler, cheaper and all-natural: It's the power of momentum and gravity. I've always been halfway to a hypermiler. I'm not obsessive about it, but in city driving, I enjoy timing stoplight approaches to keep the wheels rolling and avoid the inertia of restarting from a stop. There's little point to needlessly racing and braking between red lights, wasting kinetic energy (and therefore fuel). So I tend to drive strategically instead, often catching up with the drivers who jackrabbit but get hung up at the lights. And, back when I owned a long line of vehicles with manual transmissions, I coasted. Coasting used to be slightly controversial. Some claimed it doesn't actually save gas, though my mileage calculations showed otherwise. Another school of thought insisted that removing engine braking from the equation, even momentarily, constitutes a dangerous loss of control. Of course, an experienced driver can slip a manual transmission back into gear in a flash when engine braking's actually needed. And one should always use some common sense and judgment about when and where to coast. I'm not talking about careening down a 15% grade into a school zone.  Anyway, those arguments became moot when automatic transmissions pretty much took over. (And no, never coast with a typical automatic transmission. Even if it weren't damaging to your type of automatic — but assume that it is — the risk of screwing up a nudge of the shifter from drive into neutral is too great.) XC90 Recharge 8 View 18 Photos But happily, some automakers in recent years have added a coasting feature to their automatics, with the aim of eking out more fuel efficiency. Volvo calls the feature on its Aisin eight-speed "Eco Coast." Some Mercedes, BMWs and others call it "sailing" or "gliding." The Hyundai Ioniq, Ford Mustang Mach-E and Polestar 2 are among EVs that allow you to cancel out all regeneration and freewheel downhill. And future cars such as the BMW iX are also being designed to do it. By building coasting into the clockworks, automakers have taken any traffic safety concerns out of the question, because the car will instantly switch you back into gear when needed.

Volvo already planning road-going V8 Supercar?

After decades of cat-and-mouse battle waged between Holden and Ford, Australia's V8 Supercars series has expanded considerably. Mercedes and Nissan both joined the grid last season, and Volvo has followed suit this year. So when 2014 championship kicked off earlier this month in Adelaide, everyone was watching to see who would come out on top.
The answer is Holden, which took first place in all three of the weekend's races. In fact the General Motors division locked out the podium in the first and third races and took first and third places in the second race, letting just one other manufacturer onto the podium the entire weekend - and that was Volvo. The Polestar S60 scored second place on its first race weekend, beating all the Nissan Altimas, the Mercedes E63 AMGs, the Ford Falcons and most of the Holden Commodores.
Now that's hardly winning the championship, but it's a very solid debut. And that point was not lost on the people back at headquarters in Sweden, who are already thinking about making a roadgoing version of the race-spec V8 Supercar.

Volvo's SuperTruck 2 looks ready to extend a ramp for K.I.T.T.

In 2009, the U.S. Department of Energy (DOE) entered a public-private partnership with willing Class 8 truck makers, the goal of the partnership to dramatically improve the freight efficiency of over-the-road (OTR) trucks. The term "freight efficiency" refers to freight-ton efficiency, a different metric than miles per gallon because it takes into account the weight of the truck; a lighter tractor-trailer can carry more weight before reaching the 80,000-pound legal maximum on most U.S. highways. Volvo, Daimler (which owns the Freightliner and Sterling brands), Navistar (International), and Peterbilt signed on the the partnership to develop what's being called a SuperTruck. Volvo, Daimler, and International make their own engines, Peterbilt teamed up with Cummins, and all four found their own trailer manufacturers to work with. Those four makers debuted their first iterations of what's being dubbed SuperTrucks about six years ago. This year has been all about SuperTruck 2, Volvo the last of the quartet to show what it's achieved. The goal for SuperTruck 1 was to achieve a 50% increase in freight efficiency compared to a 2009 baseline, the baseline in Volvo's case being a 2009 VNL 670 tractor. The goal for SuperTruck 2 was another 50% improvement. Volvo said its internal goal was a 120% betterment compared to 2009, and that it exceeded the mark with a 134% increase. The company said the huge gains came primarily from aerodynamics: A wedge-shaped front with a smaller frontal area thanks to a smaller cooling package; the heavily curved, wraparound windshield; the tractor's adjustable ride height; using camera for side mirrors; and adding a boat tail to the back of the trailer, plus enough fairings and skirts front-to-back to make the tractor and trailer look like a single unit when driving in a straight line. Volvo did make changes to its rolling lab that aren't likely to infiltrate the U.S. market anytime soon. It's common for U.S. OTR trucks to use a 6x4 configuration, with two axles behind the cab, both driven. Volvo's SuperTruck 2 went with a 4x2 setup common in Europe, using a single axle behind the cab, and fitted a composite driveshaft. Combined with making the chassis out of aluminum instead of steel, and trailer partner Wabash providing a lightweight aluminum van, the tractor-trailer combo weighed just 27,000 pounds.