The Leyton House CG901 was a Formula One racing car designed by Adrian Newey

Adrian Newey

Adrian Newey is a notable Formula One engineer and widely regarded one of the great engineers in the sport's history. He is the only designer to have won Constructors Championships with three different Formula One teams...

 for the Formula One

Formula One

Formula One, also known as Formula 1 or F1 and referred to officially as the FIA Formula One World Championship, is the highest class of single seater auto racing sanctioned by the Fédération Internationale de l'Automobile . The "formula" designation in the name refers to a set of rules with which...

 World Championship. Five chassis were built and were powered by the Judd

Judd (engine)

Judd is a name brand of engines produced by Engine Developments Ltd., a company founded in 1971 by John Judd and Jack Brabham in Rugby, Warwickshire, England...

 EV 3.5 litre V8 engine. Chassis 001 was subsequently modified mid-season to accommodate the Ilmor

Ilmor

Ilmor, founded by Mario Illien and Paul Morgan in November 1983, is a British independent high-performance autosport engineering company. With manufacturing based in Brixworth, Northamptonshire, and maintenance offices in Plymouth, Michigan, the company supplies engines and consultancy to the...

 2175A engine the team used in 1991. The drivers for 1990 were the highly rated Ivan Capelli

Ivan Capelli

Ivan Franco Capelli is an Italian former Formula One driver. He participated in 98 Grands Prix, debuting on October 6, 1985. He achieved 3 podiums, and scored a total of 31 championship points...

 and Maurício Gugelmin

Mauricio Gugelmin

Maurício Gugelmin is a former racing driver from Brazil. He took part in both Formula One and the Champ Car World Series. He participated in 80 Formula One grands prix, debuting in 1988 for the March team. He achieved one top-three finish and scored a total of ten championship points in the series...

.

The CG901 appeared in two distinct specifications, the early season A spec and the mid to late season B spec. The change was largely an aerodynamic update to correct design errors incurred as a result of erroneous data from the team's wind tunnel. The basis for the car was an evolution of the CG891 of 1989 but with even less compromise from an aerodynamic stand point. This approach caused the car to be extremely sensitive to pitch and roll necessitating a very stiff set-up.

The "tub" is a monocoque type of carbon fibre construction encapsulating the driver, front suspension dampers and fuel cell. The cockpit area was reputed to be very small and cramped, in fact on the lower portion of the tub two external blisters are visible to allow the driver's heels to fit into the narrow space. The dampers were located in front of the driver's feet and were of 2 way adjustable Koni type. The dampers were actuated via rockers by pushrods from the front uprights. The detachable nose section incorporates the front wing which was bolted from the underside and sat proud of the nose itself.

The engine is attached to the tub via studs and nuts and acted as a fully stressed member. The cooling system was configured in a similar manner to that of the Indycars Newey had designed prior to his involvement with Formula One. The water system is composed of two large coolers that fed through a water oil heat exchanger in the right hand sidepod.

The gearbox was attached to the engine through a bell housing that formed the lower part of the engine oil tank, the upper part being a sculpted carbon fibre affair. Of six speed longitudinal configuration the gearbox differed to most conventional layouts in that the selector mechanism was located at the front of the assembly. The rear suspension like the front utilised pushrods compressing the horizontally mounted Koni dampers via rockers.

The most striking feature of the CG901 was its aerodynamics, it was if nothing else a very beautiful car. The B specification update included a new design of floor building on the established practice of an exhaust fed diffuser. The engine cover was extremely small and very narrow following the curves of the tub.

The electronics package was principally supplied by Zytek

Zytek

Zytek Group Ltd is an automotive and motorsport company founded in 1981 and based in Fradley and Repton, United Kingdom. Zytek Group has two main division: Zytek Automotive, which is based at Fradley, Staffordshire; and Zytek Engineering, which is based at Repton, Derbyshire.-Zytek Automotive:Zytek...

 Engineering however the car did utilize a Marelli ignition package for at least part of the season.

The performance of the CG901 was very poor before the introduction of the B specification car at the French Grand Prix

1990 French Grand Prix

The 1990 French Grand Prix was a Formula One motor race held at Paul Ricard on July 8, 1990. It was the seventh race of the 1990 Formula One season. It was the 68th French Grand Prix and the 14th and last to be held at Paul Ricard...

 of 1990. In both France and Britain

1990 British Grand Prix

The 1990 British Grand Prix was a Formula One motor race held at Silverstone on July 15, 1990. It was the eighth round of the 1990 Formula One season. It was the 45th British Grand Prix and the 26th to be held at Silverstone...

 both Capelli and Gugelmin showed dominant form bewildering their much better-funded rivals. For the remainder of the season performance remained patchy and was plagued with reliability problems.

Complete Formula One results

Year	Team	Engine	Tyres	Drivers	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	Pts.	WCC
	Leyton House Racing Leyton House Racing Leyton House Racing was a Formula One constructor that raced in the 1990 and 1991 seasons.It was, in essence, a rebranding of the March team which returned to F1 in 1987. Leyton House, a Japanese real estate company, had been the team's marquee sponsor since that year, and went on to buy the team...	Judd EV V8 V8 engine A V8 engine is a V engine with eight cylinders mounted on the crankcase in two banks of four cylinders, in most cases set at a right angle to each other but sometimes at a narrower angle, with all eight pistons driving a common crankshaft....			USA 1990 United States Grand Prix The 1990 United States Grand Prix was a Formula One race held on March 11, 1990 in Phoenix, Arizona. It was the opening round of the 1990 Formula One season. It was the 32nd United States Grand Prix since the American Grand Prize was first held in 1908, and the 25th since the first United States...	BRA 1990 Brazilian Grand Prix The 1990 Brazilian Grand Prix was a Formula One race held on March 25, 1990 at Interlagos. It was the 19th Brazilian Grand Prix and the ninth to be held at Interlagos. The São Paulo circuit had not held the Grand Prix since 1980 and the circuit was extensively renovated with the circuit itself...	SMR 1990 San Marino Grand Prix The 1990 San Marino Grand Prix was a Formula One motor race held on 13 May 1990 at Imola. It was the third round of the 1990 Formula One season. It was the tenth San Marino Grand Prix and it was the eleventh time Imola hosted a Formula One Grand Prix...	MON 1990 Monaco Grand Prix The 1990 Monaco Grand Prix was a Formula One motor race held on 27 May 1990 at Monaco. It was the fourth round of the 1990 Formula One season and the 48th Monaco Grand Prix...	CAN 1990 Canadian Grand Prix The 1990 Canadian Grand Prix was a Formula One motor race held on 10 June 1990 at Circuit Gilles Villeneuve. It was the 28th Canadian Grand Prix and the 12th to be held at the Circuit Gilles Villeneuve...	MEX 1990 Mexican Grand Prix The 1990 Mexican Grand Prix was a Formula One motor race held at Autodromo Hermanos Rodriguez on June 24, 1990. It was sixth race of the 1990 Formula One season, the 14th Mexican Grand Prix and the fifth since the Mexico City circuit returned to the Formula One calendar in 1986...	FRA 1990 French Grand Prix The 1990 French Grand Prix was a Formula One motor race held at Paul Ricard on July 8, 1990. It was the seventh race of the 1990 Formula One season. It was the 68th French Grand Prix and the 14th and last to be held at Paul Ricard...	GBR 1990 British Grand Prix The 1990 British Grand Prix was a Formula One motor race held at Silverstone on July 15, 1990. It was the eighth round of the 1990 Formula One season. It was the 45th British Grand Prix and the 26th to be held at Silverstone...	GER 1990 German Grand Prix The 1990 German Grand Prix was a Formula One motor race held at Hockenheimring on July 29, 1990. It was the ninth round of the 1990 Formula One season. The race was the 52nd German Grand Prix and the 14th to be held at the Hockenheimring. It was the 39th and last Formula One Grand Prix to be held...	HUN 1990 Hungarian Grand Prix The 1990 Hungarian Grand Prix was a Formula One race held at Hungaroring on August 12, 1990. It was the tenth round of the 1990 Formula One season. The race was the sixth Hungarian Grand Prix and the fifth to be held at the Hungaroring...	BEL 1990 Belgian Grand Prix The 1990 Belgian Grand Prix was a Formula One race held at Spa-Francorchamps on August 26, 1990. It was the eleventh round of the 1990 Formula One season. The race was the 48th Belgian Grand Prix. It was the 36th to be held at Spa-Francorchamps and the seventh since the circuit was extensively...	ITA 1990 Italian Grand Prix The 1990 Italian Grand Prix was a Formula One motor race held on 9 September 1990 at Monza. It was the twelfth race of the 1990 Formula One season...	POR 1990 Portuguese Grand Prix The 1990 Portuguese Grand Prix was a Formula One motor race held on 23 September 1990 at Autódromo do Estoril. It was the thirteenth round of the 1990 Formula One season. The race was the 19th Portuguese Grand Prix and the seventh to be held at Estoril. It was held over 61 laps, of a scheduled 71...	ESP 1990 Spanish Grand Prix The 1990 Spanish Grand Prix was a Formula One motor race held on 30 September, 1990 at Jerez. It was the 31st Spanish Grand Prix and the fifth and last time the Grand Prix would be held at the Jerez circuit in Valencia before moving to a new larger facility near Barcelona in Catalonia, though it...	JPN 1990 Japanese Grand Prix The 1990 Japanese Grand Prix was a Formula One motor race held on 21 October 1990 at Suzuka. It was the fifteenth and penultimate round of the 1990 Formula One season. It was the 17th Japanese Grand Prix and the fourth to be held at Suzuka...	AUS 1990 Australian Grand Prix The 1990 Australian Grand Prix was a Formula One race held on 4 November 1990 at Adelaide. This was the 500th race to contribute to the World Drivers' Championship. The race was the 55th Australian Grand Prix and the sixth to be held on the Adelaide street circuit...	7	7th
				Maurício Gugelmin Mauricio Gugelmin Maurício Gugelmin is a former racing driver from Brazil. He took part in both Formula One and the Champ Car World Series. He participated in 80 Formula One grands prix, debuting in 1988 for the March team. He achieved one top-three finish and scored a total of ten championship points in the series...	14	DNQ	Ret	DNQ	DNQ	DNQ	Ret	DNS	Ret	8	6	Ret	12	8	Ret	Ret
				Ivan Capelli Ivan Capelli Ivan Franco Capelli is an Italian former Formula One driver. He participated in 98 Grands Prix, debuting on October 6, 1985. He achieved 3 podiums, and scored a total of 31 championship points...	Ret	DNQ	Ret	Ret	10	DNQ	2	Ret	7	Ret	7	Ret	Ret	Ret	Ret	Ret