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A smoother operator | 2017 Acura MDX Sport Hybrid First Drive

There's a lot to unpack when trying to understand the 2017 Acura MDX Sport Hybrid. Acura is billing it as a three-row crossover infused with NSX technology via a sport-oriented hybrid drivetrain. So it's a hybrid crossover, sure. But it doesn't comport itself like a traditional crossover, nor is it a conventional hybrid. What it is, underneath, is an intentionally subtle blend of impressive technologies doing their best to appear transparent – and it's too subtle, I fear, to be appreciated by those who'd like it the most. This is a lot of foreshadowing, but if you're not familiar with the MDX Sport Hybrid's powertrain, let's fill you in. The MDX Sport Hybrid uses the same basic system as the 2014 RLX Sport Hybrid, with some newer NSX battery tech sprinkled in, packaged neatly into the refreshed third-generation MDX platform. The system improves handling and efficiency – but more important, it smoothes out the harshness of shifts and engine stop-starts. We do need to examine the system in some detail to understand how all this affects the MDX as a whole, so let's go toe to tail. Up front is a transversely-mounted 3.0-liter V6 making 257 horsepower and 218 pound-feet of torque, as well as featuring i-VTEC and cylinder deactivation. It's slightly smaller than the 3.5-liter V6 found in the conventional MDX and many other Honda and Acura products. Attached alongside is a Honda-produced 7-speed dual-clutch transmission that has a 47 hp, 109 lb-ft electric motor-generator stuffed inside. Amidships are the battery pack and the electronics to control it, and stretching aft from there are large cables feeding power to a pair of electric motors that reside in single housing, one for each wheel. Together, they produce electron witchcraft and torque-delivery wizardry – and add 72 hp and 108 lb-ft of torque to the mix. The total system output is 321 hp and 289 lb-ft of torque – a gain of 31 hp and 22 lb-ft over the conventional MDX SH-AWD. Beyond the raw numbers, there's the remarkable subjective benefit of the Sport Hybrid's drivetrain. Engine start-stop events are quiet and smooth, nearly imperceptible when under way – in stark contrast to the too-perceptible shudder of competing engines kicking on. The electric motors (mainly the one residing in the transmission) add in power to make up for the lull during a shift, making shifts up or down seamless, as well as providing regenerative capacity.

NHTSA gives okay for three automakers to skirt tire-related recalls

BMW, Honda, and Mercedes-Benz are all going to avoid small recalls, after the National Highway Traffic Safety Administration issued petitions for "findings of inconsequential noncompliance" to the three manufacturers, according to Tire Business. Basically, the petitions allow the brands to avoid recalls for some very, very minor issues.
BMW had tire placards on 364 X6 M CUVs that stated the car could only handle four passengers, when in reality it had room for three in the back. Actual plausibility of fitting three real humans in the slope-roofed Bimmer aside, the Munich-based manufacturer argued it was inconsequential, as the placards were correct regardless of the number of passengers.
Honda's case focused on 212 2011 and 2012 Acura TSX sedans equipped with 18-inch wheels. The TPMS systems on these cars were set for 17-inch wheels, rather than the larger hoops, but even with the lower settings, the tires maintain adequate load capacity.

Acura TLX GT racecar to make motorsports debut at Detroit Grand Prix

Acura debuted its TLX GT racecar at the 2014 Detroit Auto Show earlier this year, and it looks like the racer is set to get its first competitive outing in Motown as well. The RealTime Racing team is competing with a single car driven by Peter Cunningham for the Pirelli World Challenge rounds during the Detroit Grand Prix from May 30 through June 1.
Honda Performance Development is developing the TLX GT with a direct-injected, twin-turbocharged V6 engine, based on the production, naturally aspirated version, and all-wheel drive helps maintain traction. A second car is being added to the effort later.
The turbocharged Acura sedan will face competition in the series from vehicles like the Audi R8 LMS, Cadillac CTS-V, Dodge Viper, Nissan GT-R, Porsche 911 and more. With the Detroit Grand Prix hosting the sixth and seventh races in the Pirelli World Challenge GT class schedule, it doesn't seem that Acura is expecting to win the series in its debut season, but it will surely gain valuable experience.