power to weight-weight ratio, a brilliant idea Koenigsegg to assess the effectiveness of a sports
I recommend you follow the blog Koenigsegg. The small Swedish company manufactures some of the best supercars on the planet, but still very close to its customers and the media. This blog has articles of Christian von Koenigsegg himself and other employees of the brand. Recently they published a great article on weights and measures, which we spoke of an unknown ratio. An evolution of the power to weight ratio: the power to weight-to-weight ratio, ideal for measuring the effectiveness of a sports. I'm more than intrigued, what about you?
A twist to the known power to weight ratio, which emphasizes the importance of weight in a sports content.
The power to weight ratio - or power to weight and usually put these parts - is a simple ratio measuring power available to move each kilo of weight of the car. A sports as the Porsche 911 3.0 Biturbo, has 370 hp standard and a curb weight of 1,430 kilograms. Its power to weight ratio is 0.26 hp / kg, or if you want to rephrase, 3.86 kg / CV. Now suppose the existence of two cars with a power-weight ratio of 1 CV / kilo relationship. Both machines are extremely fast and efficient, right?
One of them weighs 600 kilos and has 600 horsepower, something like a Formula 1 car The other, weighs 3,000 kilograms and has 3,000 horsepower, saving the differences, could be a Bugatti Chiron with an enhancement of its engine and much ballast. TOMBOs have a power to weight of 1 kg / CV, relationship but what would be the fastest car and cash? In terms of top speed car hp 3000 would be much faster: with good aerodynamics, weight is not as relevant in achieving a good tip.
However, on a twisty circuit, the huge inertia of 3,000 kilos car will hinder greatly its cornering, you will need huge brakes to stop - with its attendant mass suspended - and will not accelerate as fast on the short straights. That is why Koenigsegg guys offer us a different ratio, which It takes into account the weight of a car over its power to weight ratio. They call it power to weight-weight (PPP) ratio and is ideal for measuring the effectiveness of a sports car.
It is calculated as follows:
power-weight for weight (PPP) = (power / weight) / weight * 10000
That is, the power to weight ratio car weight is divided and multiplied by the number 10000 to be easily readable simply. The higher the ratio PPP car, the more effective will be. Returning to our initial examples, the car 600 kilos and 600 hp would have a PPP relationship 16,666, while the car 3 tons and 3,000 CV - our "Chiron" enhanced - must conform with PPP ratio of 3.333. Thus, it is very clear what is the most effective car.
See below a few examples based cars that we all know:
Volkswagen Golf GTI (220 hp): (220/1351) / 1351 * 10000 = 1.21
Porsche 911 Carrera 3.0 Biturbo (370 hp): (370/1430) / 1430 * 10000 = 1.81
Nissan GT-R NISMO (600 hp): (600/1720) / 1720 * 10000 = 2.03
Caterham Seven 160 (80 hp): (80/490) / 490 * 10000 = 3.33
Ferrari 488 GTB (670 hp): (670/1370) / 1370 * 10000 = 3.57
Bugatti Chiron (1,500 hp): (1500/1995) / 1995 * 10000 = 3.77
KTM X-Bow R (300 hp): (300/865) / 865 * 10,000 = 4.01
Koenigsegg Agera RS (1,160 hp): (1160/1382) / 1382 * 10000 = 6.07
Caterham Seven CSR 260 (260 hp): (260/575) / 575 * 10000 = 7.86
This shows that despite the Caterham Seven CSR 260 has less than 1,240 hp Bugatti Chiron is more effective in this circuit is twisty defend better. 488 GTB Ferrari is dangerously close to Chiron, also. Obviously other factors come into play as the number of drive wheels, the weight distribution or arrangement of the engine, but as an approximation, it is a ratio that gives a lot of play and it highlights how important it is weighing a sports content - more than a massive power.
Of course, there are exceptions: According to this formula, a Nissan GT-R NISMO 600 hp has a PPP ratio of 2.03, and has proven to be exceptionally effective in Nürburgring where proved nearly 20 seconds faster than cars as KTM back X- BOW R 300 hp, with a ratio of 4.01 PPP. I encourage you to carry forth the calculator and the PPP relationship calculéis several cars that you may know. No more power is always better performance equivalent to or better behavior. Tell that to Colin Chapman.
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