In 2015, I spent a week with a TLX 2.4 equipped with a Technology Package. It was the lease special, but I gave the car high marks for its driving dynamics, wishing mainly for better brakes and stickier tires. This time around, my TLX 3.5 SH-AWD test car granted one of those wishes.
They're ridiculously overpriced accessories, but the 19-inch wheels and 245/40 Z-rated 19-inch Michelin Pilot Super Sport tires, in combination with the TLX 3.5’s excellent 290-hp V6 engine, torque-vectoring SH-AWD, and Agile Handling Assist brake torque-vectoring technology, absolutely transform the TLX’s driving dynamics, allowing the car to fly from corner to corner with grace, speed, and confidence.
Switch the Integrated Dynamics System (IDS) into Sport Plus mode, dive down a mountain road, start flicking the 9-speed automatic transmission’s paddle shifters, and the TLX puts a big smile on your face. The steering doesn’t provide much in the way of feel, but is naturally weighted and responds quickly. Versions of the car equipped with SH-AWD forego Acura’s Precision All-Wheel Steer system, which helps make the front-drive trims handle better. The heavier V6 engine also parks more weight over the car’s nose, but with the tires and technology working their magic, the TLX compensates beautifully.
There’s just one problem.
If it’s hot outside, and you’re exercising the car with vigor, it won’t take long to cook the brakes. And I’m talking well done here - extra crispy.
My TLX 3.5 SH-AWD test car had the same 12.6-inch ventilated front and 12.2-inch solid rear discs that Acura installs in every TLX. From my previous drive of the TLX 2.4, my notes indicate that the brakes warmed up in heavy stop-and-go driving, grumbling and grinding while negotiating Los Angeles traffic. This time around, I didn’t drive the car under those conditions. Instead, I discovered that the brakes fade to a significant degree under conditions in which a driver counts upon them the most.
Testing day was hot, and temperatures on the downhill portion of my mountain test route were in the mid-80s. It did not take long for the TLX’s brakes to heat up and start to fade, and by the time I reached the point where I typically perform a panic braking simulation, they had boiled to the point that transmission downshifting and the resulting engine braking produced greater slowing than did the actual braking components.
From my perspective, any car marketed as a performance luxury sedan requires more substantial components than this, especially when a buyer is spending almost $3,700 on upgraded wheels and tires, which improve grip, which in turn allows the car to carry more speed on a twisty road, which in turn means the brakes are going to get a harder workout. For example, when you order a BMW 3 Series with the Track Handling Package, you’ll spend just $2,300 for bigger 18-inch wheels, performance tires, and upgraded braking components, along with variable sport steering and an adaptive M-tuned suspension.
In taking this issue up with Acura’s engineering department, the company responded thusly:
“The combination of high temperatures, larger-than-standard wheels and tires, and spirited, downhill driving appear to have caused brake fade in this instance. It is unlikely that the majority of drivers will encounter this combination of factors and experience fade in their day-to-day driving, and we’ve received positive feedback on the car’s braking capability generally.”
Acura’s statement is accurate in that I did not experience any braking issues outside of this specific type of driving and under those specific conditions, but a subsequent run on my test loop under similar heat and weather conditions in a BMW 3 Series equipped with that car’s optional Track Handling Package revealed nothing more than a hint of fade. Furthermore, the BMW’s brakes brought the car to a swift and speedy stop during my panic-braking test.
If you emphasize the performance half of the TLX’s performance luxury equation, keep this brake-fade issue in mind. Also, keep in mind that the big wheels and tires appear to generate more cabin noise and impact harshness than might the standard 18-inch wheel-and-tire combination, producing a certain amount of cognitive dissonance within the context of the TLX’s cushy suspension tuning.
Drive the TLX around town and on the highway, in the manner of a responsible citizen of society and with the IDS set to Normal mode, and you’ll be hard pressed to understand why Acura says this is a performance sedan. That’s because the Acura feels soft, smooth, and somewhat disconnected, almost leisurely.
This is fine, though, because most people who buy a luxury car want these characteristics most of the time. Egregiously, though, the TLX exhibits an unbecoming tendency to bound and sway following pavement crests and dips. For example, while driving at 75 mph in the carpool lane of the southbound 405 freeway through West L.A., sharper bridge transitions, and especially those located mid-bend in the highway, produced a greater amount of body motion than expected.
I’ve got no complaint with the TLX’s 3.5-liter V6, though. It's creamy smooth, loaded with power and torque, and sounds terrific when revved. I would, however, recommend sticking to Normal and Sport driving modes and forgetting about the Economy and Sport Plus settings, which make the car as lazy as your good-for-nothing stepfather or as frenetic as a Chihuahua taking a potty break on a cold winter’s day.
Seriously, if you use Sport Plus mode in any situation other than when driving as fast and as hard as you can, the obnoxious revving and freewheeling between gears during downshifts will cause significant amounts of irritation. And Economy mode is the equivalent of a shot or two of Nyquil to the TLX’s drivetrain.
Equipped with variable cylinder management and an automatic engine stop/start system, my TLX was rated by the EPA to return 25 mpg. I got 22.8 mpg on my test loop, using either Normal or Sport mode the majority of time.