Porsche 911 991.1 vs 991.2 Carrera S Engine Performance Evaluation
The moment you press the throttle in a Porsche 911 Carrera S, the engine responds with an immediacy that defines German performance engineering.
You feel it in your chest before you hear it. That deep, mechanical growl from behind you. The way the car squats and then launches forward with a smoothness that feels almost unnatural. But here’s the thing—the 991.1 and 991.2 Carrera S deliver that experience in completely different ways. One screams. One surges. Both are brilliant, just not the same kind of brilliant.
TL;DR
The 991.1 Carrera S (2012–2015) uses a naturally aspirated 3.8-liter flat-six making 400 horsepower, rewarding drivers who love high-revving drama. The 991.2 Carrera S (2016–2019) switched to a 3.0-liter twin-turbo flat-six with 420 horsepower and massive low-end torque, making it faster in daily driving but less theatrical at redline. Both use the PDK Transmission option, but they feel like different sports cars.
Key Takeaways
- 991.1 Carrera S: 3.8L naturally aspirated flat-six, 400 hp, 325 lb-ft, 7,800 rpm redline
- 991.2 Carrera S: 3.0L twin-turbo flat-six, 420 hp, 368 lb-ft, 7,500 rpm redline
- The 991.2 is quicker to 60 mph (3.9s vs 4.1s with Sport Chrono) but trades character for efficiency
- Turbocharging added 43 lb-ft of torque and improved fuel economy by roughly 14%
- The 991.1’s engine sound is widely considered more exotic and emotionally engaging
The Evolution of Porsche Performance: From Natural Aspiration to Turbo Power
Porsche faced a problem in the early 2010s. Emissions regulations were tightening across Europe, and the naturally aspirated engines that defined the 911 were struggling to meet new standards without sacrificing power. The solution? Turbocharging. But Porsche didn’t just slap turbos on the old engine. They started fresh.
The 991.1 Carrera S: The Last of the Screamers
The 991.1 Carrera S arrived in 2012 with a 3.8-liter Flat-Six Engine that revved to 7,800 rpm . That’s a sky-high redline for a modern production car. The engine used direct fuel injection and VarioCam Plus variable valve timing to make 400 horsepower and 325 lb-ft of torque . Peak power didn’t arrive until 7,400 rpm, which meant you had to work the engine to extract its full potential.
And that was the point. The 991.1 Carrera S rewarded drivers who understood that performance wasn’t just about straight-line speed—it was about the journey to redline. The engine built power progressively, like a wave that swelled as the tachometer needle climbed. The Porsche 911 has retained its rear-engine layout for over six decades, and the 991.1 reminds you why that configuration works so beautifully.
The PDK Transmission was optional, and it shifted with a crispness that felt almost telepathic. But the manual was available too, with a seven-speed gearbox that gave purists the connection they craved.
The 991.2 Carrera S: Turbocharged Revolution
December 2015 changed everything. Porsche introduced the 991.2 generation, and the Carrera S swapped its 3.8-liter naturally aspirated engine for a 3.0-liter twin-turbo flat-six . Power jumped to 420 horsepower, and torque rocketed to 368 lb-ft—a 43 lb-ft increase .
But the real story wasn’t the peak numbers. It was where the power lived. The 991.2’s turbo engine made its full torque from just 1,700 rpm and held it all the way to 5,000 rpm . That meant effortless acceleration in everyday driving. You didn’t need to downshift three gears to pass someone. You just pressed the throttle and the car surged forward.
The trade-off? The redline dropped to 7,500 rpm, and the engine sound changed. Porsche engineered a sound duct to pipe induction noise into the cabin, and the optional sport exhaust helped, but the 991.2 never quite matched the 991.1’s operatic wail .
“Porsche continues to set the benchmark by combining motorsport heritage, daily usability, and cutting-edge engineering.”
Performance Comparison: The Numbers Tell the Story
| Model | Engine | Horsepower | Torque | 0-60 mph (Sport Chrono) | Redline |
|---|---|---|---|---|---|
| 991.1 Carrera S | 3.8L NA Flat-Six | 400 hp | 325 lb-ft | 4.1 seconds | 7,800 rpm |
| 991.2 Carrera S | 3.0L Twin-Turbo Flat-Six | 420 hp | 368 lb-ft | 3.9 seconds | 7,500 rpm |
The 991.2 is objectively faster. But speed isn’t everything. The 991.1 feels more alive at high rpm, more willing to play, more rewarding when you get it right. The 991.2 feels more competent, more effortless, more like a grand tourer than a sports car.
Here’s an ownership tip: If you’re buying used, the 991.1 Carrera S with the optional Powerkit made 430 horsepower and shaved 0.2 seconds off the 0-60 time . These are rare but worth seeking out.
Real-World Impact: How These Cars Feel on the Road
Daily Driving
The 991.2 wins here. That low-end torque makes city driving effortless. The PDK Transmission shifts smoothly, and the improved fuel economy—up from 11.5 to 13 km/L—means fewer stops at the pump . The 991.2 also gained a Sport Response Button that gives you 20 seconds of maximum boost, perfect for quick overtakes .
Spirited Driving
The 991.1 takes the crown. On a winding road, the naturally aspirated engine encourages you to chase the redline. Each gear change feels like a event. The sound builds and builds until it becomes a mechanical symphony. The 991.2 is faster through the corners—Porsche widened the rear tires from 295mm to 305mm and retuned the suspension —but it’s almost too easy. The 991.1 asks more of you, and that’s part of its charm.
Track Performance
The 991.2 is the track king. Porsche reportedly found an eight-second lap time advantage over the 991.1 on the Nürburgring Nordschleife . The turbo engine’s flat torque curve means you’re always in the power band. The brakes are stronger too, with a 6% shorter stopping distance from 100 kph .
But here’s the thing—most owners never take their 911 to a track. And on public roads, always use performance features responsibly and follow local driving laws.
911 Model Comparison: Where the Carrera S Fits
| Model | Vehicle Type | Powertrain | Key Features | Starting Price (Original MSRP) |
|---|---|---|---|---|
| 991.1 Carrera S | Sports Coupe | 3.8L NA Flat-Six, 400 hp | PASM, PDK option, 7,800 rpm redline | ~$98,000 (2012) |
| 991.2 Carrera S | Sports Coupe | 3.0L Twin-Turbo Flat-Six, 420 hp | PASM standard, Sport Response Button, 7,500 rpm redline | ~$103,000 (2016) |
| 991.2 Carrera 4S | AWD Sports Coupe | 3.0L Twin-Turbo Flat-Six, 420 hp | AWD (All-Wheel Drive), wider body, PDK | ~$110,000 (2016) |
| 991.2 GTS | Performance Coupe | 3.0L Twin-Turbo Flat-Six, 450 hp | Sport Chrono standard, PASM sport chassis, alcantara | ~$120,000 (2017) |
The AWD (All-Wheel Drive) system on the Carrera 4S adds weight but provides incredible traction in all conditions. It’s a different kind of confidence.
FAQ Section
What makes the 991.1 and 991.2 Carrera S engines different?
The 991.1 uses a naturally aspirated 3.8-liter flat-six, while the 991.2 uses a turbocharged 3.0-liter flat-six. The 991.2 makes more power and torque but revs slightly lower.
Which one sounds better?
Most enthusiasts prefer the 991.1’s naturally aspirated sound. The 991.2 sounds good but lacks the high-rpm scream of its predecessor.
Is the 991.2 more reliable than the 991.1?
Both engines are generally reliable. The 991.2’s turbochargers add complexity, but Porsche’s engineering is robust. Regular maintenance is key for either.
Can I daily drive a 991.1 Carrera S?
Yes, but the 991.2 is easier to live with thanks to its low-end torque and better fuel economy. The 991.1 requires more attention to keep it in the power band.
What is the PDK Transmission?
PDK stands for Porsche Doppelkupplung, a dual-clutch automatic that shifts faster than a manual and offers paddle shifters. It’s optional on both generations.
How much does a used 991 Carrera S cost today?
991.1 models typically range from $70,000 to $90,000, while 991.2 models range from $85,000 to $110,000 depending on mileage and options.
Final Thoughts: Which One Should You Buy?
If you want the purest, most emotional 911 experience, get the 991.1 Carrera S. It’s the last of the naturally aspirated Carreras, and that makes it special. The engine sound alone is worth the price of admission.
If you want the faster, more efficient, more daily-drivable 911, get the 991.2 Carrera S. It’s objectively better in almost every measurable way.
But “better” and “more enjoyable” aren’t always the same thing. And that’s what makes this comparison so interesting.
Which Porsche 911 engine do you prefer—the screaming naturally aspirated flat-six or the torque-rich turbo? Share your thoughts in the comments.
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