Renault adopted the Matra concept as project J11, which was then given the name "Espace." One restraint was that Renault used longitudinally mounted engines whereas the P23 had been designed with the more efficient transverse layout in mind. The design ended up using the longitudinal layout, which allowed for more flexibility in engine fitment and also made developing a four-wheel-drive version easier. Installing the PRV V6 had been considered from early on but ended up having to wait until the introduction of the second generation. To make the engine installation as short as possible, the radiator was placed to the left in the engine compartment, with the engine reaching the grille. The compact installation necessitated an extended front end for turbodiesel models as this engine was longer; these have a protruding grille and a correspondingly larger front bumper. Renault improved on Matra's original design by insisting on an entirely flat floor in the entire area behind the front seats.