1989–1994
[size=-1]Turbochargers were banned from the 1989 Formula One season, leaving only a naturally aspirated 3.5 L formula. Honda was still dominant with their RA109E 72° V10 giving 675 hp (503 kW) at 13000 rpm on McLaren cars, enabling Prost to win the championship in front of his team-mate Senna. Behind were the Renault RS01 powered Williams, a 67° V10 giving 650 hp (485 kW) at 14300 rpm. Ferrari with its 035/5 65° V12 giving 660 hp (492 kW) at 13,000 rpm. Behind, the grid was powered mainly by Ford Cosworth DFR V8 giving 595 hp (444 kW) at 10,750 rpm except for a few 600 hp (450 kW) Judd CV V8 in Lotus, Brabham and EuroBrun cars, and two oddballs: the Lamborghini 3512 80° V12 powering Lola and the Yamaha OX88 75° V8 in Zakspeed cars. Ford started to try its new design, the 75° V8 HBA 1 with Benetton.
The 1990 Formula One season was again dominated by Honda in McLarens with the 690 hp (515 kW) at 13000 rpm RA100E powering Ayrton Senna and Gerhard Berger ahead of the 680 hp (507 kW) at 12750 rpm Ferrari Tipo 036 of Alain Prost and Nigel Mansell. Behind them the Ford HBA4 for Benetton and Renault RS2 for Williams with 660 hp (492 kW) at 12,800 rpm were leading the pack powered by Ford DFR and Judd CV engines. The exceptions were the better Lamborghini 3512 in Lola and Lotus, and the new Judd EV 76° V8 giving 640 hp (477 kW) at 12,500 rpm in Leyton House and Brabham cars. The two new contenders were the Life which built for themselves an F35 W12 with three four cylinders banks at 60°, and Subaru giving Coloni a 1235 flat 12 from Motori Moderni.
Honda was still leading the 1991 Formula One season in Senna's McLaren with a 710 hp (529 kW) at 13,000 rpm 60° V12 RA121E, just ahead of the Renault RS3 powered Williams benefiting from 700 hp (520 kW) at 12,500 rpm. Ferrari was behind with its Tipo 037, a new 65° V12 giving 710 hp (529 kW) at 13,800 rpm also powering Minardi, just ahead the Ford HBA4/5/6 in Benetton and Jordan cars. Behind, Tyrrell was using the previous Honda RA109E, Judd introduced its new GV with Dallara leaving the previous EV to Lotus, Yamaha were giving its 660 hp (492 kW) OX99 70° V12 to Brabham, Lamborghini engines were used by Modena and Ligier. Ilmor introduced its LH10, a 680 hp (507 kW) at 13000 rpm V10 which eventually became the Mercedes with Leyton House and Porsche sourced a little successful 3512 V12 to Footwork Arrows; the rest of the field was Ford DFR powered.
By the end of the 1994 season, Ferrari's 043 was putting out 820 hp (611 kW) at 15,800 rpm.[/size]
