Dyno test shows new McLaren 720S is more powerful than we thought

Article by Christian A., on August 10, 2017

As far as McLaren is concerned, the new mid-engine, rear–wheel-drive, two-seater McLaren 720S has a new 4.0-liter biturbo V8 engine that delivers a max power output of 710 hp (529 kilowatts) at 7.500 rpm as well as 537 pound-feet of torque (770 Newton-meters) at 5,500 rpm. But it seems that these power figures were seriously underrated, as shown by some new dyno numbers, as reported by DynoBoost.

Of course, while an engine has the capability to deliver the published power figures, a certain percentage of power is lost as it is sent from the engine to the drivetrain. For supercars like the McLaren 720S, it is generally accepted that around 15 percent of engine power is lost. This means that if a supercar is capable of delivering 1,000 hp, around 150 hp is lost through the drivetrain. As a result, only 850 hp is actually realized by the supercar.

Applying this 15-percent power loss rule on the McLaren 720S, the British supercar should be delivering around 603 hp of power output and 456 lb.-ft. of torque. These should still be impressive power figures for the McLaren 720S.

However, as per BoostAddict, the McLaren 720S was placed under dyno testing, which basically allows us – using a dynamometer -- to see how much force and torque an engine or a motor could produce. The dyno test showed that at max, the McLaren 720S could deliver up to 698.56 hp of output at around 6,590 rpm and up to 560.93 lb.-ft. of torque at 5,220 rpm.

Looking at these figures, it seemed that the 4.0-liter biturbo V8 engine in the McLaren 720S has more potential than the carmaker is claiming. If the aforementioned rule is applied, a 15-percent power loss means that this mill is able to produce around 822 hp of max output and 660 lb.-ft. of peak torque. That’s already an insane amount of power!

But here’s the catch. As per dyno test and after employing McLaren’s published power figures for the 720s, the power output loss is only around four percent. In addition, the torque level on the crank of the McLaren 720S is significantly higher than the figure released by the British carmaker (560 lb.-ft. vs. 537 lb.-ft.)

Dubbed as having better aerodynamics than its predecessor (the 650S Coupe), the McLaren 720S is also a better performer in terms of power. Compared to the 3.8-liter engine from which it was derived, the 4.0-liter V8 engine features a lighter crankshaft with a longer stroke, lighter pistons and connecting rods, new turbos and an array of other upgrades.

According to McLaren, the 720S could sprint from zero to 60 mph in 2.8 seconds and reach a quarter mile in 10.3 seconds. Top speed is set at 212 mph.

Source: boostaddict.com

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