Alfa Romeo 75 Turbo Evoluzione IMSA
The Alfa Romeo 75 Turbo Evoluzione was a limited-production homologation special built to allow Alfa Romeo to compete in Group A touring car racing, particularly in the Italian Superturismo championship and IMSA competition. Just 500 examples were required for homologation, and Alfa Romeo built exactly that number, each one a focused, lightweight, and purpose-built machine that blurred the line between road car and race car.
The foundation was the Alfa Romeo 75 (known as the Milano in North America), one of the last true Alfisti cars with its front-engine, rear-transaxle layout that provided near-perfect weight distribution. The 75 was already an engaging driver's car in standard form, but the Turbo Evoluzione took the concept to an entirely different level.
The engine was a turbocharged version of Alfa's twin-cam four-cylinder displacing 1,779 cc, fitted with a Garrett T3 turbocharger. In road-legal trim, the Evoluzione produced approximately 155 horsepower — modest by today's standards but significant for a car weighing just 1,080 kilograms. In racing specification, the engine could produce well over 300 horsepower, which was the real purpose of the exercise.
The bodywork was dramatically different from the standard 75. Massively flared wheel arches accommodated wider tracks and larger wheels, giving the Evoluzione an aggressive, purposeful stance. The front bumper was redesigned with additional cooling ducts, and the rear featured a subtle lip spoiler. Most body panels were constructed from lightweight materials to reduce weight. The overall visual effect was striking — the Evoluzione looked exactly like what it was: a thinly disguised racing car.
The chassis was perhaps the most impressive aspect. Like the SZ that would follow it, the Evoluzione used a de Dion rear axle with a Watt's linkage, providing excellent rear-end control under the hard acceleration that the turbo engine could deliver. The rear brakes were mounted inboard at the transaxle, reducing unsprung weight. The front suspension used double wishbones with torsion bars. The overall handling balance was exceptional, with the transaxle layout providing the weight distribution advantages that made Alfa Romeos such engaging drivers' cars.
In competition, the 75 Turbo Evoluzione was formidable. It won the Italian Superturismo championship and was competitive in IMSA racing, where its sophisticated chassis layout gave it handling advantages over front-engine, front-drive rivals. The racing versions produced significantly more power from the turbocharged engine and ran with further weight reduction.
All 500 Evoluzione road cars were finished in Rosso Alfa (Alfa Red), following the same philosophy as the later SZ. The interior was stripped of unnecessary luxury items, with lightweight Recaro bucket seats, a Momo steering wheel, and minimal sound insulation. Each car was individually numbered.
Today, the 75 Turbo Evoluzione is one of the most sought-after Alfa Romeos of the modern era. Its combination of racing pedigree, limited production, and the engaging driving experience that the transaxle layout provides makes it a favorite among Alfisti worldwide. Clean, low-mileage examples are increasingly rare and command strong prices.
Verify homologation number and documentation. Many of the 500 built were converted to race spec, so original road-specification cars are rarer than production numbers suggest. Check for correct widebody panels — reproduction parts exist. The turbocharged four-cylinder requires careful maintenance including turbo oil feed line inspection and timing belt changes. De Dion axle bushings and Watt's linkage joints wear and are critical for handling. Rust is a major concern on all 75 models — check thoroughly in sills, floor, and inner arches. Transaxle operation should be smooth — rebuilds are specialized and expensive.
Exactly 500 units produced for Group A homologation. All finished in Rosso Alfa. Built at the Arese factory with additional hand-finishing for the widebody panels and racing components. The road cars were the minimum required for homologation — the real purpose was the racing program. Many road cars have since been converted to racing specification, reducing the number of original road-spec survivors.