Updates for the
McLaren’s twin-turbo 4.0-liter V-8, named M840TR here, gets a rework for duty in the Senna, where it makes 789 horsepower. To get to that output level, engineers swapped in new camshafts, redesigned the intake and plenum (now with a roof intake), and fitted two high-flow fuel pumps. The intake plenum also is made of carbon fiber and, at six pounds, weighs about half as much as the cast unit in the 720S. Compared with the 710-hp engine in the 720S, the Senna’s V-8 churns up its greater power at 7250 rpm, 250 rpm lower, and produces 22 additional pound-feet of torque (590 lb-ft at 5500 rpm) with a pair of low-inertia twin-scroll turbos. As much as 516 lb-ft is on tap at 3000 rpm. The engine will be tasked with moving what we expect is a 2850-pound car when loaded with fluids. We may never have the opportunity to confirm McLaren’s performance claims from this extra-limited hypercar—zero to 60 mph in 2.7 seconds and a quarter-mile pass of 9.9 seconds—but we have typically bested McLaren’s estimates by a tenth or two when we’ve tested its models in the past.
Source : https://www.caranddriver.com/news/more-mclaren-senna-info-spills-forth-heres-what-you-need-to-know-news?dom=tw&mag=cdb&src=socialflowTW