A measured limit to exhaust backpressure after the turbo should be which of the following?

The measured limit to exhaust backpressure after a turbocharger is properly indicated as 14 inches of water (inH2O). This specification is critical because excessive backpressure can lead to decreased engine performance, reduced efficiency, and potentially damage the turbocharger and the engine itself.

Turbochargers rely on a specific range of exhaust flow to operate efficiently, and maintaining the correct backpressure ensures that the turbocharged system can effectively push exhaust gases out of the engine, promoting better airflow and boosting performance.

In contrast, the other options don’t represent the typical backpressure limits used in engine setups with turbochargers. Options measured in inches of mercury (inHG) are not commonly referenced for exhaust systems, and the lower measurement of 3 inches of water would generally be inadequate for ensuring optimal turbocharger performance. Hence, 14 inches of water is the recognized threshold for proper exhaust backpressure after a turbo, aligning with standard engineering practices in the automotive field.