Turbochargers have their difficulties, but Porsche has a unique way to solve them.
The way the turbochargers work, the turbine uses the engine to rotate which encourages more air in the engine to create a boost cycle, which takes quite some time to start. In terms of reactivity, a turbocharger is usually slower than a normally aspiring engine or supercharger. Traditionally, effective turbocharging requires compromise: a larger turbo helps with higher engine speeds, while a smaller turbo does a better job at lower speeds.
However, Porsche, since the 997 generation of the 911, has used a variable turbine geometry turbo technology, which works using a van on the turbine as the size of the turbocharger varies depending on the engine speed. Jason Fensk of the Engineering Explained YouTube channel explains how the variable geometry turbo of the Porsche 911 works and why it is an intelligent solution to the problem of turbocharging.
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The technology was introduced in the automotive world in diesel cars in 1997, and the first time it took nearly a decade to introduce the technology in gasoline cars (in 2006 on the 997 Porsche 911 Turbo) the exhaust temperature was much higher than diesel in a petrol engine. The small parts involved in these systems are difficult to maintain surrounded by high temperatures, so the engineering and materials involved in creating a reliable variable geometry turbocharger for a gasoline engine are extremely precise and efficient.
The Porsche 911 Turbo S, the current generation of the 992, produces 640 horsepower and 590 lb / ft of torque, thanks to this technology. The biggest bonus of the variable geometry turbo is the fact that at maximum power, you still have approximately 500 lbs / ft of torque. The 992 Porsche 911 Turbo S also has a symmetrical design of turbocharger, which means the flow is clearer and more efficient than the 991 generation, where the air did not flow very nicely. It’s no secret that the Porsche 911 Turbo S is an incredible machine, but learning how it’s capable of achieving this incredible functionality makes it even more special.
Source: Engineering explained