. About a car internal combustion engine. Lets suppose the engine torque is maximum at 3500 RPMs when the engine gets also its maximum load, lets say, a 90%. This kind of data is usually shown at WOT. My question is: if the throttle is not wide open, but half open, allowing the cylinders to be loaded with 45% (half of the maximum load), is the engine torque also reduced to the 50%? and so would the output power?. I mean, at the same RPMs, is torque proportional to the engine load? Or, Does the engine efficiency change when partially loaded and then, the torque is something difficult to figure out? and so, would I need my engine BSFC map to solve this question?. I will really appreciate any input about this. Thanks in advance.