Engine Testing - General Information Section 14 - Engine Testing - Group 14 M11 Page 14-12 Consider another example: The turbocharger compressor inlet temperature measured between the air cleaner and the turbocharger is 70°F and the intake manifold temperature is 49°C [120°F]. At the intersection of the 49°C [120°F] intake manifold temperature curve (B), and the vertical line (A) for 21.1°C [70°F] compressor inlet temperature, draw a horizontal line (C) to the vertical axis and record the boost correction factor. In this example, the intake manifold boost correction factor is 2.0.
This added to each end of the base intake manifold boost specification range gives 53 to 62 in-Hg as the new acceptable boost range. Now, what this new range says is that the engine is generating the expected power and is not suffering from low power if the measured intake manifold pressure is actually between 53 and 62 in-Hg.