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Audi TT RS vs. Porsche 718 Cayman S


From the March 2018 issue

In the winter of 1846, a group of pioneers seeking a better life in the vast unknown of the American West got trapped by weather in the mountains of the California territory. Bored and running desperately low on cheesy Pringles, they had to turn to the most cursed of sustenance: putrefied beef jerky from the Sherman Oaks Chevron station.

Did we say 1846? We meant 2018. And it’s cool; only one of our three pouches of Oberto had turned gray. Still, though, we didn’t know that could happen to beef jerky.

All-wheel drive might make for hellacious launches, but it doesn’t help the car turn or stop when you drive into freezing rain on summer tires.

We’d fled subzero temperatures in Michigan to conduct this comparison test in the fair Southern California weather, only to arrive just in time for the area to get its first precipitation of consequence in many months. For two straight days it rained and snowed, but finally the weather cleared and we could really crank up our Conestogas.

Audi's TT RS is new for 2018 and powered by a 400-hp turbocharged 2.5-liter inline-five. Compared with lesser TTs, the RS gets a front fascia with larger intakes that flare out for more airflow, a purposeful wing and large-caliber oval exhaust outlets in back, and a price that starts at $65,875. Our example’s options list was a lengthy one, but nearly all of it mattered. The $6000 Dynamic Plus package nets carbon-ceramic front brake discs and the stiffer Sport suspension; the $3500 Technology package adds navigation and a Bang & Olufsen sound system. The $1750 Black Optic package grants the roly-poly TT some menace by blacking out the exterior trim and mirror caps, and the $1000 exhaust system matches that with black tips and a loud button. All told, our Audi TT RS tallied $80,200.

That’s very nearly as expensive as the Porsche 718 Cayman S it’s up against. Having forsaken the flat-six that was so central to its identity, the Cayman is powered by a turbocharged flat-four as of 2016. In the S, as in the TT RS, it’s a 2.5-liter, this one rated at 350 horsepower. Prices start at $67,350, but in typical Porsche fashion, the Cayman we tested stretched somewhat spendier. Notable additions include the Sport exhaust with a loud mode to match the Audi’s for $2890; the adaptive PASM Sport suspension that lowers the car 0.8 inch and stiffens the springs and anti-roll bars for $2070; 20-inch wheels for $1580; and a limited-slip differential with brake-based torque vectoring for $1320. And then there’s another $6380 in rinky-dink tier-two nonsense to inflate the final sticker to $81,590.

The Cayman holds the distinction of having earned a spot on our 10Best list every year it’s been available, so it’s fair to say we like it. But it’s also fair to consider this TT a coupe version of the RS3, which joined that list this year. Should be a good fight. Wagons ho!

It’s a high-style way to navigate the mountains, but the TT RS is no prima donna. With 354 pound-feet of torque at 1700 rpm and all-wheel drive, this red-orange nugget launches like a magma loogie. Launch control revs the five-pot to 3500 rpm and then dumps the clutch, so that the TT RS blows past 60 mph in just 3.2 seconds. The apogee of car cuteness until Pixar got into the game, the TT has turned nasty, running 11.6-second quarter-miles at 119 mph.

Thrust from the five is immediate and monstrous no matter where you are in the powerband. But we do wish the engine had a more natural soundtrack. Its warble is unique, but in either quiet or loud mode, it sounds so synthesized that it might as well be a four-cylinder trying to sound like a five. The only high-performance quintuple on the market should be allowed to trumpet its weirdness. (The Ford Transit’s turbo-diesel five is unlikely to stir any souls.)

Audi’s little coupe has no match when it comes to interior styling. It’s fastidiously detailed, with hardly a contour change or line break that isn’t set off with a new material or finish. Just look at the seats—black leather with red contrast stitching around diamond-patterned perforations, each of which allows a peek at the red underside of the seating surface. Even the seatbelts have red bands along their edges (part of the $900 RS Design package). Audi incorporates all of this without making the TT look fussy or overly busy, and the in-dash air vents seem to have benefited from as much engineering as the entire Dodge Dart.

Perhaps it’s the back seat—strictly for kids—but the Audi’s interior feels more spacious than the Porsche’s. That said, it’s in the Audi that tall drivers will find their heads jackhammering the headliner on rough roads. That Sport suspension swaps in stiffer fixed-rate dampers for the standard adjustable units. Technical director Eric Tingwall noted: “The short suspension travel, stiff compression, and loose rebound control mean this car can feel both harsh and springy—often in the same suspension event.” It’s fine on smooth pavement and for commuter duty, but on rough roads, you get the impression that the suspension is taking each input, then magnifying it and propelling the body upward with two times the force.

And despite that, the Audi can’t match the Porsche’s feel or feedback. The lack of body movement and dearth of steering feel make it hard to tell when the Audi is at its limits. You end up driving the car not quite certain how close you are to the edge of control, which is particularly unnerving in the wet.

The TT RS is an accomplishment, a dramatic departure from what the TT had been, and an impressive car. It’s just a little too narrowly focused, a little too compromised, to beat the Cayman. Then again, the Cayman is very nearly a perfect sports car.

Parts of California feel as if nature imagined infinite racetracks, piled them on top of and wove them through one another, and then sat back waiting for mankind to invent the automobile and pavement. There are few cars we’d rather drive on roads like these than the Porsche Cayman. It is, as Tingwall put it, “the finest example of chassis neutrality that exists.”

Whereas the Audi’s ride tends toward punishing, the Cayman’s has some baked-in compliance that helps communicate loads and forces to the driver. But don’t mistake softness for weakness: While the TT RS nipped the Cayman by 0.01 g around the skidpad, the Porsche outpaced the Audi in the most critical dynamic evaluation, our unequally spaced slalom that combines acceleration, deceleration, and cornering. The Cayman’s steering weight increases predictably to let you know how close to the limit you are, and the low hoodline afforded by the mid-mounted engine is a boon for forward visibility that makes placing the Porsche on the road a cinch. In the Audi, the uniform radius of the bulbous nose hides the corners of the car pretty effectively.