First, a fact: according to Wikipedia, the amount of fuel injected into an engine at any moment is proportional to the number of cylinders running, rpm, and how much the accelerator is pressed. Therefore, for most vehicles with fixed cylinders, it just depends on how high the engine is revved, and how much pressure is exerted on the accelerator. So, for the same rpm, the fuel injected depends entirely on accelerator pressure.
Secondly, the fuel to an engine is fed by a pressure pump, so the engine can quickly allow more fuel in to adjust to excess amounts of air, in the ideal 14.7 to 1 air to fuel ratio, for proper combustion.
Thirdly, however, the air flow cannot quickly catch up with the sudden increase in fuel pressure, in instances of pressing the accelerator hard. The air is never compressed in a normally aspirated engine, and even in a turbocharged engine, the air is not pressurized before the turbocharger is on boost, and for a supercharged engine, the air is not compressed before a certain rpm, as the supercharger is mounted onto and takes the rotational speed of the engine. This means that in these instances, the fuel is always more ready than the air to enter the engine, and cause over-fueling.
Due to inertia at a standstill, the accelerator is pressed more, and fuel always goes in first, and air lags. The Surbo, with its air jetting capability, stores pressured air in the engine oil chamber from idle, and as this supplies more torque to the engine, it requires less accelerator pressure to move the car. Therefore, the air-fuel ratio becomes closer to ideal, and even if there is excess air, the engine will sense it via its air flow meter or absolute pressure sensor, and feed the correct amount of fuel. This results in quicker acceleration, and a higher gear can be used sooner, so that fuel will be saved.
Watch the video above showing how an engine revs with Surbo. Or watch it with the How it works page.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 130 kph.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 211 kph.
Above: video of Volvo XC90 T8 with Surbo, sprinting to 224 kph.
More torque and BHP (dyno test)
Quick revving (1/2 throttle to RPM limit)
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