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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.

Acura NSX to race in GT3 or GTE

Honda is reportedly planning to roll out a racing version of the new Acura NSX. It just hasn't decided yet on which class it wants to enter it into, to whose specifications it will build it, and which department will be tasked with the project. The original NSX competed principally in Japan's own Super GT series. So did the subsequent HSV-010 GT that was originally designed to be the NSX's replacement. But Acura's new supercar is as much an American vehicle as a Japanese one, and as such it looks more likely to compete on American soil. The options which Honda is considering boil down to GTE and GT3. What's the difference, you ask? Until just a few years ago, international sports car racing was split between GT1, GT2, GT3, and (to a lesser extent) GT4 classes. GT1 was phased out in 2009, GT2 was reformatted into GTE (with both Pro and Am categories), while both GT3 and GT4 carried on. Today GTE is run at the 24 Hours of Le Mans and its associated championships around the globe: the FIA World Endurance Championship, the European Le Mans Series, the Asian Le Mans Series, and the United SportsCar Championship. Meanwhile GT3 is run in series like the Blancpain Endurance Series and a growing number of regional championships. (GT4 is run in lower-level series for amateur racers.) Acura currently runs the TLX-GT in the Pirelli World Challenge here in America. But as the series moves to GT3 specifications as well, the company is facing the decision of either adapting the existing racer to the new regulations (and coming away with a potentially compromised package), or replace it entirely. The NSX could prove just the ticket, however the GTE class may ultimately give it more exposure. Whichever rulebook Acura opts to play by, it likely won't be running under hybrid power – an element which would add complication but not necessarily much benefit under current regulations. The automaker will also have to decide who will develop the new NSX racer, with both California-based Honda Performance Development (HPD) and Italian outfit JAS Motorsport (which fields Honda's WTCC team) eyed as potential candidates. Related Video:

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.