{"id":48451,"date":"2026-04-13T10:29:47","date_gmt":"2026-04-13T08:29:47","guid":{"rendered":"https:\/\/www.italpassion.fr\/?p=48451"},"modified":"2026-04-07T11:05:58","modified_gmt":"2026-04-07T09:05:58","slug":"this-tuner-pushed-two-alfa-romeo-75s-to-the-limit-one-with-a-360hp-bialbero-turbo-the-other-with-a-500hp-v6-busso","status":"publish","type":"post","link":"https:\/\/www.italpassion.fr\/en\/alfa-romeo\/ce-preparateur-a-pousse-deux-alfa-romeo-75-a-lextreme-lune-avec-un-bialbero-turbo-de-360-ch-lautre-avec-un-v6-busso-de-500-ch\/","title":{"rendered":"This tuner took two Alfa Romeo 75s to the extreme... one with a 360hp turbo Bialbero, the other with a 500hp Busso V6."},"content":{"rendered":"
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Swiss tuner OKTech is now recognized as one of the world's leading specialists in Alfa Romeo<\/a> modified classics. Its philosophy is to retain the architecture and spirit of the original Alfa Romeo, while completely modernizing the mechanics, chassis and transmission. The aim is to build what an Alfa Romeo 75 could be, had its development continued to the present day with modern technologies. He has just completed two projects that represent two extreme visions of the modern Alfa Romeo 75.<\/p>\n\n\n\n

In the red corner, with a 16-valve 2-liter Bialbero, the 75 IMSA M. In the black corner, a 75 equipped with a 4.0L 24-valve V6 Busso with 7-speed sequential gearbox. These two cars are not mere preparations, but genuine technical reconstructions aimed at creating modern Alfa Romeo 75s with race-car performance. Both projects are therefore based on the same concept: the Alfa Romeo 75 with transaxle architecture, with the engine at the front and the gearbox at the rear, providing good weight distribution and well-balanced dynamics.<\/p>\n\n\n\n

OKTech 75 IMSA M: a turbine-powered bialbero!<\/h2>\n\n\n\n

The 75 IMSA M is inspired by the 75 Turbo Evoluzione, designed for racing and released in 1986. In order to enter it in the 1988 Giro d'Italia, Alfa Corse had developed a version meeting IMSA regulations, which allowed for more engine preparation. This version is oriented towards the spirit of turbocharged touring cars.<\/p>\n\n\n\n

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It's powered by a modified Alfa Romeo four-cylinder twin-shaft \u201cNord\u201d engine, more commonly known as the \u00abBialbero\u00bb, equipped with turbocharger, intercooler and modern electronic management. Power is estimated at around 360 hp, and OKTech claims torque in excess of 500 Nm. The engine is designed for high revs and intensive use on the racetrack. In addition to the bright-red cylinder head, a small detail that adds to its charm is the classic Olio oil cover, as found on old bialbero models from the 50s and 60s.<\/p>\n\n\n\n

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The chassis is reinforced, the suspension is adjustable and track-tuned, the brakes are racing-style, and the interior is fully gutted and fitted with a roll-bar, bucket seats and racing-style controls.<\/p>\n\n\n\n