race trim and around for qualifying. EF4: Bore x Stroke 7.0:1 Compression, two Garrett turbochargers. It was the last engine to be badged "Renault Gordini", as there was now a new name to promote: Renault Sport. "Type-Bis" early 1985 This engine's defining characteristics were its centralized electronic injection and ignition control systems. Generating just over , it powered the Renault RE60, Lotus 97T, Ligier JS25 and Tyrrell 014. It was responsible for one race win, two pole positions and two podium finishes. EF4: Bore x Stroke 7.0:1 Compression, two Garrett turbochargers. EF15 mid-1985 With greater fuel economy thanks to its new dimensions and a lower boost pressure, its horsepower nevertheless oscillated between and , thanks to metallurgical developments in the turbochargers. It earned two race wins and five pole positions for Lotus, as well as ten podium finishes (four for the Lotus 97T, four for the Ligier JS25 and two for the Renault RE60). EF15: Bore x Stroke 7.5:1 Compression, two Garrett turbochargers. "Type-B" early 1986 This engine boasted two innovative features that would soon gain widespread acceptance – static ignition and pneumatic valve actuation – which allowed it to reach 12,500 rpm. Capable of generating in race trim, it would record two race wins and five pole positions with Lotus, as well as five podium finishes (three with Lotus and two with Ligier). It powered the Lotus 98T and the Ligier JS27. EF15B: Bore x Stroke 7.5:1 Compression, two Garrett turbochargers. "Type-C" mid 1986 Equipped with a number of new features (cylinder heads, cylinder block, waste-gate, mapping, etc.) and developing more than at 12,500 rpm in qualifying, this engine enabled Ayrton Senna's Lotus 98T to notch up four pole positions and three podium finishes to close the V6 turbo era in style. Formula One World Championship results References EF Formula One engines Gasoline engines by model V6 engines