[Crumpp]

Direct fuel injection does the same

Injecting into the eye of the supercharger is no more efficient than a carburetor at fuel metering.

Eg

Start at 288 K. Cool by 25 K. T = 263 K. Compress through a temperature ratio of 1.5, and then further through a temperature ratio of 2. Temperature = 263*1.5*2 = 789 K. Delta T from start = 501 K.

Compare with:

Start at 288 K. Compress through temperature ratio 1.5, cool by 25 K and then compress through temperature ratio of 2. Final temperature is then 814 K, so delta T is 526 K.

Thus, compressor work differs by 5% or so in this example.

You are still getting the compression from a supercharger and directly cooling the combustion chamber with direct fuel injection.

I am sorry Viper but it does not change the fact you cannot precisely meter the fuel thru an intake, either.

Modern engine designs are now starting to employ direct-injection.
Here fuel is introduced straight into the cylinder rather than
being premixed outside. This technique has major advantages
as it allows more accurate control of the quantity of fuel used and
the injection timing, leading to an increase in the vehicle’s
horsepower combined with a lower fuel intake.

Direct-injection is far more efficient than traditional
injection techniques, raising performance levels while requiring less fuel.

http://www.onsemi.com/site/pdf/PSDE_0411.pdf