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1 power ratio
calculated specific power (kW / kg or kw / T) equation: Engine maximum net power / total vehicle mass
power ratio is a measure of dynamic performance of the car integrated indicators, specifically refers to the total mass of the car with the car engine maximum power (see above corresponds to the concept of two words to explain) ratio. In general, for the same type of motor vehicle, the greater power than the power of the car, the better. Dynamic vehicle determined by the vehicle running resistance and the driving power, the output power of the engine propel the vehicle forward via a transmission system, the transmission loss deduction, that is, drive power, the car is moving, the driving power is equal to the power resistance. Generally comprises automobile driving resistance, rolling resistance, air resistance and gradient resistance inertial resistance during acceleration traveling. The product of the resistance and the vehicle speed is called a power resistance. Automotive power resistance increases with the total weight of the vehicle speed and the vehicle is increased, so that the power of the car is substantially dependent on the ratio of power. Since the maximum speed occurs when the engine reaches maximum power and the transmission is in top gear, it is, simply put, is the car than the maximum speed determines the power factor.
For example: public Bora Bora 1.8T and 1.3 compared to truck Overall, total vehicle weight and other parameters are similar, however, since the maximum power of the two engines are 78 kilowatts and 110 kilowatts, specific power were about 84 kW / t and 60 kW / t, resulting in maximum speed there is a big gap between the two cars.
ordinary domestic low vehicle range between about 0.04 to 0.07 per kilogram; mid-range cars range from about 0.06 to 0.10 per kg; luxury car is higher, wider range, range from about 0.08-0.13 per kilogram; basic car can reach 0.10 kg or even more than, the Porsche 911 Carrera Coupe (Tiptronic S) ratio of power up to 0.16 per kg