http://www.slideshare.net/rjperforma...rj-performance
It works in any engine to increase power and performance over any other fuel metering system no matter if the intake is supercharged or not.
http://www.steerbythrottle.com/hccyong/files/DFI.pdf
Quote:
Advantages of direct fuel injection
Combined with ultra-precise computer management, direct injection allows more accurate control over fuel metering (the amount of fuel injected) and injection timing (exactly when the fuel is introduced into the cylinder). The location of the injector also allows for a more optimal spray pattern that breaks the gasoline up into smaller droplets. The result is more complete combustion -- in other words, more of the gasoline is burned, which translates to more power and less pollution from each drop of gasoline.
Disadvantages of direct fuel injection
The primary disadvantages of direct injection engines are complexity and cost. Direct injection systems are more expensive to build because their components must be more rugged -- they handle fuel at significantly higher pressures than indirect injection systems and the injectors themselves must be able to withstand the heat and pressure of combustion inside the cylinder.
How much more powerful and efficient is direct injection?
Cadillac sells the CTS with both indirect and direct injection versions of its 3.6 liter V6 engine. The indirect engine produces 263 horsepower and 253 lb-ft of torque, while the direct version develops 304 hp and 274 lb-ft. Despite the additional power, EPA fuel economy estimates for the direct injection engine are 1 MPG higher in the city (18 MPG vs 17 MPG) and equal on the highway. Another advantage: Cadillac's direct injection engine runs on regular (87 octane) gasoline. Competing cars from Infiniti and Lexus, which use 300 hp V6 engines with indirect injection, require premium fuel.
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http://cars.about.com/od/thingsyoune...tinjection.htm
A good primer article on Direct Injection. It explains very well the difference between the various types of fuel injection and why Direct Injection is the ultimate fuel metering system for power and performance.
http://www.driverside.com/auto-libra..._injection-350
Here is a good article that explains the German Direct injection systems in easily understandable terms:
http://www.motorcycleproject.com/mot...xt/inject.html
The German systems were far from perfect but they certainly did their job and allowed them to level the playing field in terms of aircraft engine performance.
IIRC, the British and United States did a combined effort to develop a Direct Injection engine that was used in a tank at the end of the war.