Turbo Boost and FE

[Backtobasics]

2 things to consider between a N/A and turbo motor. One is negative, the other is positive.....

1. exhaust restriction. The manifold is normally very short, creating restriction, plus the restriction in the body of the turbo, the restriction of the propeller, and any addition angles and turns that the exhaust must overcome to exit the into the exhaust system, plus the lost velocity that was used to turn the turbo hot side. Negative
2. Heat. Compressing air raises the temperature, hence the use in performance applications of an "Intercooler" (aftercooler), to remove heat. The additional heat on a turbo application, regardless of the the boost pressure, helps to atomize the fuel better, for a more efficient combustion efficiency. This is a built in hot air intake, so to speak. Positive

Ultimately, The heat from the turbo should help to overcome the restriction of exhaust, but it is a tight battle.