Quote:
Originally Posted by UsedTaHaveA68
I believe that is due to the Direct Injection. With the LS3, the fuel is being sprayed in just above the intake valves in the intake runner. This allows the spray to condense as the droplets come in contact with each other, as well as absorb heat from the intake before it reaches the combustion chamber.
With DI, the fuel is sprayed directly into the combustion chamber at much higher pressures. This allows much better atomization of the fuel (finer mist), which cools off the intake charge much more effectively, allowing you to get away with a slightly higher compression ratio.
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Thats correct also you spray closer to your firing event so there is very little of a window in which pre-detonation can occur.