Quote:
Originally Posted by mike the snake
When turbo or supercharged, you'll need to run the port injection to some degree because the DI alone can't handle the requirements for boosting.
Also, I was under the impression that it was the DI that allowed the boosting of our engines with such high compression, and that stock, at highest load/redline that the engine runs mainly off of the DI.
For boosted, I would suspect that the DI is running full blast and the PI is added in as needed at highest loads/rpm.
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Under load, the DI injection timing is during the compression stroke to aid in cylinder cooling. I suspect you're right about that allowing the high cylinder pressures that boosted FA20s are running.