Looks like McLaren has been understating power figures again.
The McLaren Senna is an absolute monster of a car. It may not be one of the best-looking hypercars, but it's certainly one of the fastest thanks to its aerodynamic carbon body and a twin-turbo 4.0-liter V8 producing nearly 800 horsepower. It looks and performs like a hardcore track car, but it's somehow road legal. And now it turns out the Senna is even more extreme than anyone could have imagined.
McLaren has a habit of understating horsepower and torque figures for its street cars, and the Senna is no exception. The automaker claims the 720S makes 710 hp at the crank, for example, but dyno test results have shown it almost makes that much power at the rear wheels, meaning engine power likely has an output of over 750 hp. And now it appears McLaren has been conservative about the Senna's power figures too.
McLaren claims the Senna's 4.0-liter twin-turbo V8 engine pumps out a very respectable 789 hp and 590 lb-ft of torque. To find out how accurate the automaker's claim is, Hennessey Performance recently hooked up their Senna to a dyno, and the results are very impressive indeed.
At the dyno, the Senna delivered 724 horsepower at the rear wheels and 627 lb-ft of torque. Factoring in a 15 percent drive loss, this rear-wheel horsepower figure indicates the Senna's twin-turbo V8 could be producing over 830 hp. If the drivetrain loss of the car is 20 percent, engine horsepower could exceed 860 hp. With these figures, it's hardly surprising the Senna is so absurdly fast.
Despite its impressive performance, Hennessey Performance is already working to make the Senna even faster. Last month, the Texas tuner announced it's working on several tuning packages for the Senna, including one that will extract at least 1,000 horsepower from the hypercar, while another will produce around 900 hp. In stock form, the McLaren Senna needs just 2.8 seconds to do the 0-62 mph sprint before topping out at 208 mph so it will be interesting to see how Hennessey's modifications affect the performance.