The turbocharger used in the EcoBoost series of Ford engines is the Honeywell GT15, which extracts energy from the exhaust that would otherwise have gone to waste. The turbocharger consists of two sets of blades, coupled by a common shaft. One set of blades are in the turbine, whilst the other are in the compressor. The high-pressure hot exhaust gasses, power the turbine blades. A common drive shaft then rotates the compressor blades, which pumps fresh air into the intake manifold. By pumping fresh air into the intake, there is more oxygen in the cylinders and therefore the fuel burns more efficiently producing a bigger bang.
What is the EcoBoost Turbo? Does the EcoBoost have Turbo? EcoBoost is the name of the engine, whilst the turbocharger is a separate unit, which connects to the engine.
As you can see above the hot exhaust gasses drive the turbine blades. Therefore, these blades, and the turbocharger operate at extremely high temperatures, and as a result, durability and lifespan of this unit is critical. In order to increase its useful life, the water that cools the engine block also cools the bearings to keep the temperature down. In addition, Ford decided to utilise a special NASA invented super-alloy, which improves the durability of the turbocharger significantly.
Originally conceived for the Space Shuttles high-pressure pumps that fuel the rocket engines, this alloy can withstand high temperatures and stresses. To prevent thermal fatigue within the turbine blades, NASA used a new metal consisting of an alloy of nickel, cobalt, and tungsten. The fabrication of these components is expensive and hence sparingly used in applications that benefit the most. The temperature limit of the turbine blades is usually around 970 °C using conventional metals, however by using the super alloy, the temperature limit increases to 1050 °C.
Turbo lag is the time it takes from when you press the accelerator pedal to the turbocharger responding. It takes a finite amount of time for the engine to produce the exhaust gasses to drive the turbine blades. A smaller turbocharger minimises this lag in time, because it takes less exhaust pressure to spin the turbine blades.
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This Article Continues...Ford Fusion 2013
How does the Ford Fusion EcoBoost engine work?