Direct Injection Gas Engines
With the trend to direct injection gas engines what happens going down a hill on compression. Diesel engines without intake butterflies have little hold back on compression, so I assume that gassers w...
Forum Discussion
Golden_HVAC wrote:
The Ecoboost engines have a mass air flow sensor, and control the amount of air going into the engine with something similar to a throttle plate. Only change is the fuel is not injected into the air intake manifold, but into the cylinders directly, in a more energy efficient manner.
Ecoboost is a speed sensity style system with no MAF. There is most definitely a throttle plate on the engine.
There is a really good tech article on the EB 3.5 here:
Ecoboost 3.5 Info.
The lack of engine braking is more to do with the turbochargers than anything else. Not sure how but turbocharged cars (and trucks) have less exhaust braking than regular cars. I definitely notice the lack of engine braking in the Ecoboost. But Ford has some sort of Agressive fuel shutoff during decelleration that helps somewhat.
