So Nissan just revealed their LeMans engine. A 44kg (88lbs) 1.5 liter 3 cylinder turbo that produces 400hp.
http://nissannews.com/en-US/nissan/...ine-to-complement-electric-zeod-rc-powerplant
Even I have to admit that power to weight ratio is simply insane, and better than even a rotary. Now please, Nissan, use this engine in the Idx. Even if it has only half the power, even if the base isn't turbo, it will still be fantastic. And before you question it, listen to other small 3 cylinder turbo and n/a engines...because they sound
better than four cylinders:
To me, they invariably sound like 90* V6 engines, such as the NSX.