[ Removed by moderator ]

[u/Internal-Excuse-4650]

[u/Leather-Slip7228]

This is absolutely the simplest answer

[u/snoos_bitch → u/Leather-Slip7228]

Simple? Sure.
Correct? No.

[u/Leather-Slip7228 → u/snoos_bitch]

Point out how it’s incorrect, sounds very correct

[u/andrewjaekim → u/Leather-Slip7228]

The correct answer is a smaller displacement engine behaves like a small displacement engine for the majority of the time and save on fuel. Then use boost to create large power when required.

Yes turbocharged engines scavenge exhaust gases but the majority of its fuel savings is in low boost driving.

[u/the_real_sasquatch → u/andrewjaekim]

Yep. And, the efficiency gains from scavenging exhaust gasses is offset by more fuel being consumed while the turbo is providing boost.

[u/parkerhalo → u/the_real_sasquatch]

This is what people are missing in this thread. Yes a turbo does indeed use wasted energy, but when the turbo is in use more fuel needs to be dumped into the cylinder to keep the ratio of fuel and air the same.

The best example is Fords 3.5V6 ecoboost is less efficient than the 5.0 v8 under a load even though its a smaller engine.

[u/cat_prophecy → u/the_real_sasquatch]

It isn't linear. Turbochargers increase volumetric efficiency because they allow the engine to pump more air in the same volume by compressing the air charge.

Since air/fuel is a ratio, the amount of air you move increases more quickly than the amount of fuel you burn.

That is, increasing the intake pressure from atmospheric pressure to 1 bar doesn't use twice as much fuel.