The Sport Sedan Establishment Should Be (Slightly) Worried

By Chris Walton, Chief Road Test Editor Email | Blog

The unceasing risk inherent to benchmarking your competition is that they have smart, creative folks all working just as hard to improve their products. The brass ring on the sport sedan ride is one of the most highly coveted in the world, and it's also the fastest-moving ride there is.

We've seen this pattern unfold before. But for right now, this prototype of the 2010 Acura TL SH-AWD equipped with a close-ratio six-speed manual transmission is one of the most remarkable fast sedans we've ever driven, faster than all the big names in the sport sedan game. And yet it will face newer versions of the sport sedan elite that might appear before this 2010 model reaches the street next year.

A Day of Reckoning
We are compelled to admit that this was an Acura event that took place at a facility owned by Honda (overseen by the Transportation Research Center) with all the test cars supplied and prepped by Acura R&D. It's not exactly our usual comparison format, in other words. This was our opportunity to drive a prototype of the 2010 Acura TL Super Handling All-Wheel Drive six-speed manual transmission (SH-AWD 6MT), so Acura arranged some track time at its test facility near its U.S. engineering facility in Ohio, and a competitive set of sport sedans.

The competitor cars each featured a manual transmission, the sportiest configuration currently available, and aftermarket brake pads that would stand up to an afternoon on the racetrack. The cars included a 2008 Audi S4 Quattro manual; 2008 BMW 335i Sport; 2008 BMW 335xi Sport and a 2008 Infiniti G35s.

We'd go out, run one lap, two hot laps and one cool-down in lap. Then we'd come in and switch cars with our press colleagues and repeat until all five cars were sufficiently flogged. We repeated the round robin twice and were given the opportunity to revisit any two or three cars we thought we hadn't had enough time in.

The 2010 Acura TL SH-AWD 6MT kicked serious butt. And we're not talking tenths of a second on a 1.6-mile racetrack, but instead 2 seconds (a light-year on a short racetrack like this) separated the TL from the next quickest sedan, the Audi S4 Quattro, on the challenging Dynamics Handling Course. This Alan Wilson-designed, 13-corner course is a laboratory instrument, and it dissected the strengths and weaknesses of these five cars with an array of fast/slow, compressed/unweighted, opening/closing corners.

The Lab Results
We rapidly came to some conclusions. Here's how we ranked the cars after our testing.

1st Place: While the 2010 Acura TL SH-AWD 6MT might not have the horsepower to keep up on the straight with any of these other sport sedans, it works best by far in the corners and made up time over its competition in speed at the apex and at the exit. At nearly every corner, the SH-AWD was so astute and intelligent that you could literally slap the go pedal to the carpet and let the all-wheel drive sort out how best to put the power to good use. And yes, these optional 245/40ZR19 Michelin Pilot Sport PS2 tires (the largest and stickiest of any of the tires in the entire group) really help, but it was in combination with the SH-AWD where the rubber really made a difference. This car carves the corners.

2nd Place: While the 2008 Audi S4 Quattro would seem to hold an advantage by the sheer fact that it hangs a 340-hp V8 over its front wheels and offers the traction of all-wheel drive, it is hampered by stubborn understeer on the entry to slow and moderate-speed corners. The steering remained light and precise throughout the course, as did the feel of the light-effort clutch and shifter. The S4 was the only car here other than the TL that was able to put the power to the pavement before the apex of the corners — a real advantage thanks to all-wheel drive. Poor weight distribution keeps it from getting close to the TL.

3rd Place: The BMW 335i maintains its composure even when driven extremely hard, yet it feels surprisingly slow and out of place compared to the TL and S4. Of course, putting power down with just the rear wheels means the front wheels almost needed to be straight before the throttle could go all the way to the floor. The throttle response from its twin-turbo 300-hp inline-6 is only happy and snappy in the upper rpm range, and the steering feels indirect and slow in comparison. Great brakes, but this wasn't enough to make up the 2.7-second gap to the TL. It's just too slow to react.

4th Place: Hoping the BMW 335xi's all-wheel drive would allow the 3 Series to put its 300 hp to better use, we discovered that it only further snubbed the responses of the sedan. The steering became less direct, the throttle response grew worse and the understeer became more pronounced. The added weight of the car was obvious, especially in a high-speed corner with an apex at the crest of a hill.

5th Place: To be honest, the Infiniti G35s didn't even get a second drive in the comparison. From the second corner of the first hot lap, it was painfully obvious that the heavy effort and lurching response of the clutch pedal (it turns out they're all like this), the heavy-effort shift action and an inability to keep its rear tires hooked up on anything less than a dead-straight piece of track kept the G35s from being able to put up a good fight. On this track, it required constant vigilance just to keep the G35s on the pavement.

Bits & Pieces
As with the 2009 Acura TL SH-AWD we drove last month, the 2010 TL SH-AWD 6MT features the most powerful engine Acura has ever offered in this 3.7-liter 305-hp V6 with an advanced version of iVTEC. It's linked to one of the most sophisticated all-wheel-drive systems known to man, but the big news here is that Acura has, for the first time, combined a manual transmission with its highly developed SH-AWD system.

The six-speed gearbox has been designed and built solely for this car. It's more than simply an evolution of the front-wheel-drive 2008 TL Type-S's six-speed, but instead a design that accommodates both the engine's impressive output as well as the additional complexity of all-wheel drive. Though its mainshaft and axle half-shafts have been beefed up to accommodate the V6's 273 pound-feet of torque, the manual transmission manages to be 110 pounds lighter than the five-speed automatic in the same car.

Even with the closely spaced ratios of this high-performance transmission, there's plenty of room beneath the V6's 6,700-rpm redline for a wide range of thrust in each gear. We expect the TL SH-AWD 6MT to return fuel consumption rates very close to those of the five-speed automatic, which are estimated at 17 mpg city and 25 mpg highway.

Shift action is light but precise, and the double- and triple-cone synchros never seem to mind being punished with quick shifts. Our only gripe here is that the clutch pedal doesn't offer enough information about when the clutch pack is about to bite.

Tuning With Electrons
The tuning for the car's electronic stability program, all-wheel-drive system, suspension action and steering have been brought up to the same level of accomplishment as the transmission. The SH-AWD's unique powertrain control module watches over everything from engine rpm and intake airflow to gear-ratio selection. Of course, we still shut off the uniquely tuned stability program for our lapping exercises.

Because the nose of the 6MT-equipped TL is nearly 90 pounds lighter than that of the automatic version, the engineers have tailored spring and damping rates to offer quicker and more precise turn-in characteristics. Overcook a corner entry, however, and understeer is as certain and pronounced as one would expect from a car with 58 percent of its weight over the front tires. If you've ever put a 12-pack of beer in the nose of a shopping cart then moved it to the rear, you'd know what a difference weight distribution makes.

The electric-assist power steering has been remapped to offer a more pronounced build-up in effort as the speed of the car increases, but even if some still consider the general feel to be light, we are huge fans of a low-friction feel as long as the overall effect is quick and precise like this. Because the electric motor is located on the steering rack itself rather than the steering column, there's good communication between the front tires and your hands.

The All-Wheel-Drive Future
All things considered, Acura has finally put its highly complex and effective SH-AWD system to its best use in the 2010 Acura TL SH-AWD 6MT. This all-wheel-drive technology has always seemed a bit wasted in the MDX and RDX sport-utilities. It belongs in a sport sedan, and it has found a worthy home in the TL.

We also have to applaud Acura's determination to make its products more than just another premium-brand spin-off of an existing sedan. That's what makes Honda and Acura intriguing and forward-thinking carmakers. It's also what will make our job harder when it comes time to score what will be a very tight comparison test next year.

You see, this car won't get here for another year. And in the next 12 months, the BMW 3 Series will be released with improvements. And the Infiniti G37s will arrive with more power and hopefully more poise. And finally, Audi's S4 will undergo both a heart transplant with a turbocharged V6 and a new all-wheel-drive system.

We'll see who gets the brass ring on the carousel ride around Honda's test track next year.

Edmunds attended a manufacturer-sponsored event, to which selected members of the press were invited, to facilitate this report.

2010 Acura TL to Offer All-New Manual Transmission
New 6-Speed Manual Will Be Available Next Fall on TL SH-AWD Model


TORRANCE, Calif. - 09/26/2008

By adding an available manual transmission to the TL SH-AWD® model, Acura will further up its game for performance minded TL drivers who prefer the winding route over the direct route, Acura announced today. Available next fall for the 2010 model year, will be a TL SH-AWD® with 6-speed manual transmission and numerous modifications to enhance vehicle dynamics.

"The new manual transmission equipped TL SH-AWD® really allows the enthusiast driver to take full advantage of the performance of Acura's SH-AWD® system," said Dick Colliver, executive vice president of sales, "Not only is the new manual transmission model the best performing Acura TL ever, it is the top handling performer among every vehicle in its class."

The availability of a 6-speed manual transmission for the 2010 TL SH-AWD® represents the first time Acura has ever paired its acclaimed Super Handling All-Wheel Drive™ system with a manual gearbox. In addition, the new close-ratio 6-speed manual transmission is approximately 110 lbs lighter than the Sequential SportShift automatic transmission to further benefit acceleration, braking and cornering.

The 6-speed manual transmission is an all-new design that is substantially stronger than the previous generation TL manual transmission. In addition to using a more rigid aluminum case and heavier-duty internals, the new manual transmission employs precisely selected gear ratios based on the characteristics of the TL's new 3.7L V-6 engine and SH-AWD® drivetrain. New gear synchronizers deliver improved shift accuracy and feel, and a short-throw shifter assembly generates confident shifting combined with low shift effort.

Acura engineers also designed an entirely new clutch system for the new 6-speed manual transmission to withstand the TL's robust power output while also improving modulation for noticeably easier use. The new self-adjusting, dual-mass clutch delivers extremely constant pedal effort throughout the entire stroke of the pedal. By keeping the effort linear, the driver has improved feel that results in better clutch interaction.

The TL SH-AWD® 6MT has a specially calibrated Hill Start Assist system that helps prevent the vehicle from rolling backwards when the driver switches from the brake to the accelerator while stopped on a hill. When the road incline exceeds an 8-degree threshold and the vehicle is fully stopped, Hill Start Assist automatically activates. When Hill Start Assist is active, the brakes automatically hold for one second as the driver's foot transitions from the brake to the accelerator pedal. The brakes are automatically released when the vehicle begins to move forward.

The 2010 TL SH-AWD® 6MT has exclusive suspension tuning via special coil spring and shock absorber rates tuned for flatter cornering with reduced pitching motions under acceleration and braking. The front dampers incorporate 5-percent more tension damping during low piston speeds to generate improved turn-in feel. In addition, the front dampers generate 14-percent less high speed compression damping which helps improve ride quality.

The TL SH-AWD® 6MT employs firmer engine and transmission bushings that better resist engine and/or transmission movement during spirited driving. Engine side mount bushing stiffness increases by 80-percent, front mount rate increases by 17-percent, rear hydro mount firmness increases by 50-percent and the transmission upper mount is stiffened by 100-percent.

For 6-speed manual transmission applications, special heavy-duty front driveshafts are used. In addition to being 2-percent larger in diameter, the driveshafts have a larger inboard spline size and team with more heavy-duty CV joints.

The TL SH-AWD® fit with the new 6-speed transmission will also benefit from exclusive Electronic Power Steering (EPS) tuning. Just as with the TL SH-AWD® with Sequential SportShift 5-speed automatic, the EPS delivers low steering effort for parking maneuvers that progressively firms up as speed increases.

With the 6-speed manual transmission TL SH-AWD®, the EPS system is further tuned to deliver a slightly heavier feel as speed increases thus generating more confident mid- to high-speed driving dynamics.

The addition of a manual transmission, an all-new clutch system and suspension changes yield an 88 lb. reduction in overall vehicle weight. The weight reduction not only delivers improved performance, but also generates a more favorable front/rear weight bias. Compared to an automatic transmission equipped TL SH-AWD®, the 6-speed manual version improves weight distribution by 1-percent thus generating a 58/42 ratio versus the 5AT's 59/41 ratio.

Acura offers a full line of technologically advanced performance luxury vehicles through a network of 270 dealers within the United States. The 2009 Acura lineup features five distinctive models including the RL luxury performance sedan, the TL performance luxury sedan, the TSX sports sedan, the turbocharged RDX crossover SUV and the award-winning MDX luxury sport utility vehicle.

For additional information about Acura vehicles, please visit www.acura.com. For media inquiries go to www.acuranews.com.

Still, the goals of the six-speed TL are modest. Of the projected annual TL volume of 70,000 units, Acura only predicts five percent—or 3500

Most automotive purists believe a car must be offered with a manual transmission option to be considered a ‘true’ sports car, with many of today’s so-called sports sedans failing to meet this qualification. But purists fear not, as at least one sports sedan will be receiving its credentials for 2010.

Acura has announced that’s its all-new TL sedan will be offered with a six-speed manual transmission option for the 2010 model year. The manual transmission option is squarely aimed at performance drives and will be offered in both TL models – the base front-wheel drive car and the up-level SH-AWD model.
While some manual transmissions manage to free up a few extra ponies under the hood, the manually-equipped TLs will retain their 2009 ratings – 280 horsepower for the base car and 305 for the SH-AWD model.
But the six-speed manual should aid in the TL’s overall performance. The six-speed unit actually weighs 110 pounds less than the TL’s five-speed auto – which will soldier on in 2010 – and improves weight distribution from 59/41 front/back to 58/42, according to Motor Authority. Manual transmission cars will also benefit from Acura’s Hill-Assist program and an upgraded suspension with stiffer springs and dampers. The extra cog should also help out with slightly better fuel economy.
No official word on pricing but the 2010 Acura TL should hit dealers in the second part of 2009 with a starting price in the $35,000 neighborhood.