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2026. 6. 30. 작업

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What is an A/R ratio?

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The A/R ratio is the ratio of the cross-sectional area of the area where gasses flow and the radius of that spot from the center of the turbocharger. Usually the A/R ratio is constant along the channels where gasses flow. In simpler terms The letters A/R refer to Area and Radius. If the radius of the turbocharger is greater at a given point, the cross-sectional area of that spot should be larger, to maintain a constant A/R ratio. Conversely, if the radius of the turbocharger is smaller at a given point, the cross-sectional area at that point should be smaller, to maintain a constant A/R ratio. Smaller A/R ratios optimize the turbocharger for quick response, but it reduces high RPM power. Larger A/R ratios have more boost at high RPM, but they have more "turbo lag" (delay in boost). Turbochargers have two A/R ratios, one for the turbine side (exhaust side), and one for the impeller side (intake side). If the intent of the turbocharger is to provide additional efficiency, or mo