Because it took YEARS to develop these engines. When Renault originally pushed for these regulations they probably thought they would have some kind of advantage or at the very least parity, with the added bonus of being slightly more relevant to their road cars.
It really has blown up in their face though. One might even say it has backfired. Okay I'm done with bad engine puns now.
This is very far from what is going on. Because if you read what Renault publish, their revisions for 2015 have been on the ICE, not the Kers environment. Renault have said they dropped the ball on the ICE ...
ICE (Edit) KERS might be more important than it was, but its still only a little contributor to performance.
Edited by Melbourne Park, 23 March 2015 - 06:22.