Quote:
Originally Posted by elp_jc
It doesn't 'give' the engine any more power by itself. It allows the compression to be raised (less possibility of detonation due to the cooler charge) so the engine can make more power, but it's not easily done.
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This was the topic of a very lengthy and heated debate. Well in the end it was not much of a debate since there was a vast majority who believed the evidence showed quite clearly that DI, BY ITSELF, without the benefits gained from the almost always accompanying compression bump, still does provide power gains.