The M840T is McLaren’s ultimate engine, the heart and soul of their supercar lineup. From serene grand tourers to fire-breathing track monsters, this 4.0-liter twin-turbo V-8 powers seven unforgettable McLaren models, delivering a jaw-dropping range of performance. Whether tuned for 612 horsepower in the smooth McLaren GT or a blistering 824 horsepower in the Sabre, this engine is a masterpiece of engineering.
With McLaren leaning into hybrid technology, the M840T might be phased out eventually. But until then, it’s worth celebrating its legacy. Here’s our ranking of every car powered by this mighty engine—including the machine that takes the crown.
From the M838T to the M840T
Before we step into today’s M840T-powered wonder machines, it’s worth glancing at its roots. The M840T evolved from McLaren’s groundbreaking M838T, a 3.8-liter, twin-turbo V-8 derived from the Nissan-designed VRH35 engine (originally built for a Le Mans car). McLaren, partnering with Ricardo engineers, refined and optimized the M838T for its early road cars, including icons like the MP4-12C, P1, and 650S.
When it came time to innovate again, McLaren and Ricardo reimagined the V-8, introducing the M840T. Keeping just 40% of the original design while introducing stronger components, larger turbos, more efficient cooling, and hybrid-readiness, the M840T became more powerful, responsive, and efficient.
Debuting in the 720S, the M840T left enthusiasts in awe. Since then, its versatility and adaptability have made it central to McLaren’s road cars. Now, onto the cars that best showcase its brilliance.
7. McLaren GT (2019–)
The McLaren GT is as lavish as it is capable, leaning into comfort without forgetting its racing DNA. This grand tourer is powered by a more relaxed version of the M840T, delivering 612 horsepower. The engine is tuned for smoothness, making long drives a dream, while smart tweaks like a long-distance oil lubrication system emphasize endurance over maximum aggression.
Perfect for canyon cruises or laid-back road trips, the GT still packs plenty of punch when needed. Plus, there’s even enough room in the trunk for your golf clubs. Who says supercars can’t have it all?
6. McLaren 765LT (2020–2023)
Push a 720S to the edge of its limits, strip away unnecessary weight, and what do you get? The McLaren 765LT. Short for “Long Tail,” the 765LT dials everything up with a fierce track-focused ethos. Its 755-horsepower version of the M840T benefits from lightweight titanium and Inconel components, larger intercoolers, high-capacity oil systems, and lightning-fast throttle response.
Every aspect of the 765LT screams excitement. From the ear-piercing scream of its titanium exhaust to its astonishing agility, this car is unapologetically visceral. It’s a raw, thrilling beast designed for those who crave the racetrack over the road.
5. McLaren Sabre (2020–2021)
The Sabre, a true unicorn of the McLaren lineup, is exclusivity personified. Limited to just 15 units and built exclusively for the U.S. market, this hypercar is pure, unadulterated power. The M840T, cranked up to its peak, delivers 824 horsepower and 590 lb-ft of torque. With its aggressive tuning and ultra-lightweight titanium internals, the Sabre pushes the boundaries of what’s possible without electrification.
Unfortunately, its rarity and track-exclusive design mean most fans will never experience the Sabre. But make no mistake—this car is a legend in its own right.
4. McLaren Speedtail (2019–2020)
The Speedtail isn’t just fast; it’s otherworldly. With a hybrid-assisted version of the M840T, this three-seater produces a head-spinning 1,055 horsepower, hurtling to a top speed of 250 mph. Designed as a nod to McLaren’s groundbreaking F1, the Speedtail commands more than pure speed. Its torque-fill hybrid system smooths power delivery, ensuring every mile is as elegant as it is blisteringly quick.
From its futuristic silhouette to its custom four-month paint jobs (costing over $300,000), the Speedtail is a rolling sculpture. While its insane performance is breathtaking, its exclusivity and practicality earn it the fourth spot on this list.
3. McLaren Senna (2018–2020)
Named for the legendary Ayrton Senna, this Ultimate Series McLaren is a track car at heart. With an M840T turbocharged to 789 horsepower and engineered for extreme circuit-focused performance, the Senna is an adrenaline junkie’s dream. From aggressive throttle mapping to lightweight components, every detail underpins its raw, visceral power.
Capable of thrilling drives on the racetrack and barely bearable commutes home, the Senna is as unapologetically single-minded as they come. If you want unrivaled circuit performance, look no further.
2. McLaren 720S (2017–2023)
Effortlessly balancing raw power with refined elegance, the McLaren 720S redefined what it means to be a supercar. Its 710-horsepower M840T, paired with the Monocage II carbon-fiber chassis and active aerodynamics, makes it a benchmark in speed, handling, and innovation.
Capable of rocketing to 60 mph in just 2.8 electrifying seconds, the 720S feels like a ground-hugging rocket. Comfortable for road trips yet mind-blowing on the track, the 720S remains one of McLaren’s all-time greats.
1. McLaren 750S (2023–)
The best of the best. The 750S takes everything that made the 720S exceptional and amplifies it. With 740 horsepower, it delivers an experience that’s simply unmatched. Advanced tweaks to the M840T, including turbo enhancements and recalibrations, make it more responsive than ever.
What truly sets the 750S apart is its versatility. Whether carving up Alpine switchbacks, tearing down a racetrack, or leisurely cruising through city streets, the 750S is a master of balance. It’s exhilarating, luxurious, and endlessly fun, proving why it’s the ultimate embodiment of the M840T’s capabilities.
The Legacy of the M840T
The M840T isn’t just an engine; it’s the heartbeat of some of McLaren’s most iconic cars. From GT cruising to record-breaking speeds, its versatility and precision have transformed it into a true legend. As McLaren ventures toward hybridization and beyond, the M840T leaves a legacy for future engines to follow.
Which McLaren excites you the most? Share your thoughts below, or explore the M840T in action with our latest features!
