Sierra Verde Sprint with Alfa Romeo 33 Stradale - Forza Horizon 5
1The Alfa Romeo 33 Stradale is a mid-engine sports car built by Italian automobile manufacturer Alfa Romeo. It was the fastest commercially available car for the standing kilometer upon its introduction. 18 examples were produced between 1967 and 1969. "Stradale" (Italian for "road-going") is a term often used by Italian car manufacturers to indicate a street-legal version of a racing car; indeed the 33 Stradale was derived from the Tipo 33 sports prototype. Built in an attempt by Alfa Romeo to make some of its racing technology available to the public, it was also the most expensive automobile for sale to the public in 1968 at US$17,000.
The 33 Stradale was based on the Autodelta Alfa Romeo Tipo 33 racing car. The car, designed by Franco Scaglione, and built by Carrozzeria Marazzi, made its debut at the Paris Salon de L'Auto 5 October 1967. The first prototype (chassis no. 10533.01) was built at Autodelta's workshop in Settimo Milanese, side by side with the Tipo 33 "Periscopica" race car in 1967. The body was built by Franco Scaglione and his team from Carrozzeria Marazzi, while Autodelta worked on the technical aspects of the car. Work to manufacture nother magnesium bodied prototype (chassis no. 10533.12) (intended for street racing) was started by Scaglione. However, this was not finished until 1968 by Marazzi. The two prototypes are the only ones to have the dual headlight arrangement. This was redesigned by Scaglione on the production cars due to regulations on minimum headlight distance from the ground. The two prototypes carry the project's original serial numbers, 105.33.xx. However, the Tipo 33 racing- and production cars got 750.33.0xx (racing) and 750.33.1xx (stradale) chassis numbers. Marazzi claims to have built 18 chassis. 5 of them were used for 6 concept cars (one chassis was used twice) by Pininfarina, Bertone and Giugiaro/ItalDesign and 8 were used for production cars. The rest of the chassis numbers are not confirmed due to a lack of available information as the exact number (allegedly 18) of actual Stradale-chassis (with 10 cm longer wheelbase than the race cars) doesn't quite match the range of chassis numbers.
The 33 Stradale is one of the first production vehicles to feature forward-hinging butterfly doors. The 33 Stradale also features side windows which seamlessly curve upward into the ' roof of the vehicle. The car features an aluminium body on an aluminium tubular chassis. As a result of being built by hand, each model differs from the others in some details. For example, the position of the windscreen wiper, and some of the later cars having vents added behind both the front and rear wheels to allow hot air from the brakes to escape is a differentiating factor. The car has 13-inch Campagnolo magnesium-alloy wheels, the front wheels are eight and the rear wheels nine inches wide; the brakes used are disc brakes manufactured by Girling, the rear ones are inboard. The suspension system of the car is directly derived from the Tipo 33 race car, with upper and lower control arms in the front and double trailing arms in the rear, along with substantial antiroll bars.
The race-bred engine bore no resemblance to the mass-produced units in Alfa Romeo's more mainstream vehicles. The engine is closely related to the V8 of the Montreal, albeit with a smaller displacement and in a higher power output. The engines, despite being derived from the Tipo 33 racer cars, differed in many details. For example, the 33 Stradale's engines had chain driven camshafts as opposed to the racers' gear driven ones, but the Stradale kept the racing engine's flat plane crankshaft, whereas the Montreal engine had a crossplane crank. Race engineer Carlo Chiti had designed an oversquare bore x stroke of 78 mm × 52.2 mm (3.07 in × 2.06 in) while the all-aluminum 1,995 cc (2.0 L) V8 engine was dry-sump lubricated featuring SPICA fuel injection with four ignition coils and twin spark plugs per cylinder. The engine used four chain-driven camshafts to operate the 2 valves per cylinder valvetrain featuring dual overhead camshafts and had a rev-limit of 10,000 rpm with a compression ratio of 10.5:1 The engine has a maximum power output of 230 PS (227 hp; 169 kW) at 8,800 rpm and 206 N⋅m (152 lb⋅ft) at 7,000 rpm of torque in road trim and 270 PS (266 hp; 199 kW) in race trim. Due to the hand-built nature of the drivetrain, the power output levels can vary by each car produced, for example the first production Stradale (No. 750.33.101) has a factory datasheet that states a power output of 243 PS (240 hp; 179 kW) at 9,400 rpm with a "street" exhaust and 254 PS (251 hp; 187 kW) with open exhaust. The transmission is a 6-speed unit similar to the Tipo 33 race car, designed in house by Alfa Romeo.
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