Brief Engine Volume Efficiency Volumetric efficiency(VE) is one of an important engine performance parameter, which indicates the performance of the engine. The higher the volumetric efficiency, the better the power output of the engine. The TopScan comes with VE checking functions, enter the value including Engine Size, Engine Speed, MAF, Intake Air Temp, Cylinders, and Air Intake Pressure to calculate the VE of an engine. Specs Features TopScan Pro Repair Information What's In The Box? Comp Chart FAQs