The BMW twin turbo diesel technology in my view is better conceived though I have reservations about its execution.I like the concept of converting the kinetic energy generated from brakes to electrical energy, hence charging the batteries consistently,when the car is running in hybrid mode.Further ,given that the car has just three cylindersand the amount of power that it generates is commendable. The elecrical charging system in the BMW s concept car isclearly better than the Porche 918 spider.However the Porche is clearly ahead of the BMW when it comes to stanstill speed which for the bmw is 100km|hr in 4.8 secs while the Porche just takes 3.2 secs.Also for all its creative technology the BMW loses to the porche in fuel consumption which is a phenomenal 3 litres per100 km as opposed to BMW s 3.76 litres.The fuel consumption is phenomenal in the porche because as opposed to the BMW it has a V8 engine and higher speed 320km per hr .The co2 emmisions while a bit higher on paper 70grams per km of the porche are actually very good considering the power it generates.
If I were to choose between the two,Id go for the Porche Spider 918
