Answering the question why the diesel cars are so damm fast currently, my thoughts are very clear
Fistly because of the direct injection diesel system invention; although it was discovered many years ago, always it has offered very excellent thermodinamyc properties (therefore thats why it offers very good performances and low fuel consumption), it wasnt very usable every day in cars due to its noise and vibration; however, due to the manufacturers investment alongside the new materials discovery, the direct injection alongside the turbo is useful for every segment; from little cars to luxurious ones, and the invention wont be improved for many years now
On the other hand, in the racing area, the diesel engines are so powerful and efficient, mostly due to the investment (specially the VAG group) in races as it did on the quattro four wheel drive system about 25 years ago
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