0-100 km/h por Potência

0-100 km/h acceleration: estimating launch time

A handy approximation is t ≈ (weight × V_f) / (HP × k). What dominates the result is the power-to-weight ratio. A Bugatti Chiron (1,500 HP, 1,995 kg) reaches 100 km/h in about 2.4 s, a Porsche 911 Turbo S does it in roughly 2.7 s, and a 1.0-litre hatchback popular in Brazil needs close to 14 s. All-wheel drive shaves time off a 2WD car because grip is what caps the launch, and RWD or FWD cars just spin the tires off the line. Launch Control handles clutch slip and revs so the getaway is clean. You can apply the same reasoning to 0-200 km/h and to the classic quarter-mile (1/4 mi, ~402 m) drag-race number.

Applications

Reading magazine spec sheets (Quatro Rodas, Top Gear), running comparison tests, racing simulators, drag-race videos, scoping out a supercar before buying, and homework on Newtonian mechanics that factors in rolling resistance.

FAQ

Why is power-to-weight the key number? Acceleration comes down to force ÷ mass, and engine power is what produces the force. So a car with a lower kg/HP figure launches quicker than one chosen on raw HP alone.

Does AWD always win at the line? Up to 100 km/h it usually does, since it lays all the torque down on the road. Past 150-180 km/h, though, the extra weight of the drivetrain starts working against you.

Why is the figure only approximate? A real launch hangs on tire grip, gearbox response, ambient temperature, the fuel and the driver. The formula sees none of that, so treat the number as a ballpark.