If you take a coffee straw and try to blow air through it, you quickly reach the flow limits for volume and velocity of the straws air passage. The smaller the A/R, the smaller the diameter of the straw, or air passage. Huh?Ī/R Simplified: As an example, think of A/R as a straw and you are trying to blow air through it. It is defined as the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. What is A/R?Ī/R stands for Area over Radius. Have you ever wondered what that A/R number means on a turbocharger? Why is there one on the compressor side and why is there one on the turbine side and what does it all mean? This write up is here to explain the difference an A/R makes on performance and show dyno graph overlay data for horsepower and torque to analyze how the changes affect engine response. Advanced Controls and System Optimization.48V Electric Compressor for Mild Hybrid Vehicles.
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