Quote:
Originally Posted by rwhyde
Certainly upping compression, along with direct injection to avoid detonation and variable cam timing, all are key elements in optimizing fuel economy and still offering performance when required to keep things fun. One of my earliest mentors told me that the best fuel economy was attained at the peak torque (not hp) of any engine. OF course that was long before variable valve-timing was in everything.
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There's other things that they do with Direct-Injection like doing separate sprays with the injectors to cool the cylinders.
Then they can change the AFR in a way that's not possible with port-injection so they can run both lean and rich whenever needed.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
