http://www.racer.com/nissan-reveals-rev ... le/331112/
Apperently Nissan developed a 3 cilindre 1.5l turbo engine which brings 400hp to the table at a weight of... 40kg.
It will be used in the ZEOD RC prototype.
Just for a visual reference, this is the engine:

(courtesy to racer.com for the image)
Without trying to be racist, it's probably still a bit under-impressing due a japanese holding it.