Friday 22nd October 2021

The power-to-weight ratio - all information about it and our calculator!

Reading time approx. 4 Minutes

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What is power to weight ratio and how does it affect your vehicle? The term “power to weight ratio” doesn't mean anything to you? No problem, here you can find out what it means and how it relates to the acceleration or even the Fuel consumption affects. And with our calculator you can even easily calculate the power-to-weight ratio. Simply enter the empty weight of the vehicle and the power (KW).

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Unter dem power to weight ratio one understands that Relationship between mass and engine power of a vehicle. The lower the power to weight ratio, the lower the energy consumption. This can be proven with the physical formula for the acceleration. The engine speed is independent of this. Also for that reverse In this case, the same conditions apply. If a heavy vehicle is braked, a large part of the kinetic energy is lost in warmth i.e. into oil.

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If you imagine a hill start with a heavy vehicle, it quickly becomes clear that with less weight with the same engine power less fuel is needed. At a time when energy reserves are becoming increasingly scarce, it is precisely this fact that is becoming the focus of designers and developers.

The formula is very simple

To calculate the power-to-weight ratio, all you have to do is Divide the weight of the vehicle by its engine power. The result is a quantity in kilograms per kilowatt of engine power. Example: Your vehicle weighs 1.800 kg and has an engine output of 400 kW. That means -> 1800: 400 results in a power-to-weight ratio of 4,5 kilograms per kilowatt.

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To improve the power-to-weight ratio, vehicle manufacturers could improve the equipment and comfort to reduce. For most drivers, comfort and luxury are simply part of driving a car, which is why the power-to-weight ratio of vehicles is steadily increasing.

A comparison makes it clear how big the differences between different vehicles can be: A Formula 1 car, trimmed for one minimal power-to-weight ratio, reaches values ​​of under 1 kg per kilowatt of power. And it's very similar with sporty motorcycles. The armored State car on the other hand comes up quickly 20 kilograms per kilowatt of engine outputeven if the engine is above the average performance level.

It is often just a tightrope walk between aspiration and potential savings

Around Efficiency to improve the use of the available energy, manufacturers try to without major incisions in terms of equipment, the weight of the vehicle to reduce. To achieve this goal, thinner sheets, more plastic parts, carbon, magnesium and the like are used. Each of these measures helps to conserve resources, improve the environmental balance and sometimes even go easy on the wallet.

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