Pugnacious

In the seemingly never ending "5.0L vs Ecoboost" debate threads it has often been stated that the twin turbo Ecoboost is not affected (or is not as affected) by increased elevations as the N/A 5.0L Coyote engine.

My question is: Do any of the twin turbo Ecoboost platforms used in the F150 have the ability to increase and decrease turbo boost as elevation (density altitude) increases and decreases?

acdii

It's all based on engine load. Boost is produced as called for by the PCM, and has it's limits.

The thing the turbos do is force more oxygen into the engine at higher altitudes so you get all the power it can produce, what a NA like the 5.0 can only burn so much fuel due to lack of oxygen, so the higher the elevation the greater the loss of power.

gone postal

Intake pressure is kept at a constant level, the less dense air is compressed into the same density charge that the engine would have at sea level.

Altitude doesn't matter, the air is going into the intake at X psi regardless of atmospheric pressure

RandyinTN

No matter what you read, just remember. No engine can change the air density. The reason engines lose about 3% hp for every 1,000 feet in elevation is due to less oxygen. No turbo can change the denisty of the air.

Blown F-150

Nope, but they can cram in more to compensate. Just check out some dyno sheets from high elevation locations.

RandyinTN

Nevermind

Kingofwylietx

I'm confused by your statement. Density is defined as mass per volume. A turbo increases the pressure of the air. Density is increased by pressure (more mass per volume).

RandyinTN

Why would a turbo spin faster because you are driving the truck at a higher elevation?

bassJAM

Makes sense. So it doesn't matter if atmospheric pressure is 14.7 psi at sea level, or 10 psi at 10,000 feet, the truck is still going to "suck" in the same cubic feet of air and compress it to the same gauge pressure of say, 13 psi.

Blown F-150

Because the ECM tells it to. Although it's not really "spinning faster".

The Eco is a Torque demand motor. the ECM will maintain boost (obviously within certain parameters) by managing the wastegates.

http://www.caranddriver.com/features...ration-feature

Not a huge fan of car and driver, but you get the idea.