Quote:
Originally Posted by Spuds
Higher pressure results in less losses to entropy during combustion. In theory you want the highest compression you can get at all times. But the limiting factor is the tendency of gasoline/air to detonate when you compress it too quickly. By decreasing the maximum pressure, you decrease the rate of compression. Thus allowing higher rpm, advancing timing, and more fuel/air (higher boost) at higher temperatures.
Being able to tune the compression ratio gives you the best of both worlds in the same engine.
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Absolutely but Nissan's solution seems somewhat elaborate to me. I agree with the poster who called it "marketing "