Swiss tuner OKTech is now recognized as one of the world's leading specialists in Alfa Romeo 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.
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.
OKTech 75 IMSA M: a turbine-powered bialbero!
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.
It's powered by a modified Alfa Romeo four-cylinder twin-shaft “Nord” engine, more commonly known as the «Bialbero», 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.
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.
OKTech Alfa 75 4.0: it's going to scream!
The second version developed by OKTech is even more radical. It is equipped with the famous Alfa Romeo V6 engine known as the Busso, but extensively modified to achieve a displacement of 4.0 liters with 24-valve cylinder heads. This version is more oriented towards pure performance, thanks in particular to the large-displacement naturally-aspirated V6 engine.
The naturally-aspirated engine develops between 450 and 500 horsepower and can reach very high engine speeds, close to those of a racing engine. Intake, exhaust, engine management and all the preparation work are specifically designed to achieve high power output while retaining the character of the Busso engine.
The photos of the Busso 4.0-liter clearly show individual intake butterflies - one per cylinder. This guarantees better filling and immediate engine response, even more so for high-revving engines that exceed 7/8,000 rpm. We also appreciate the impeccable finish of the materials, with a carbon airbox and a rocker cover in an anodized “gold” finish!
This 75 IMSA M is equipped with a 7-speed sequential gearbox mounted in transaxle configuration at the rear. The chassis is highly rigidified, the suspension is adjustable, the brakes are competition-style, and the interior is entirely race-oriented, with roll-bar, bucket seats and modified instrumentation.
A devastating look
The OKTech Alfa Romeo 75 IMSA M and 75 4.0 24V 7-Speed Sequential represent two different interpretations of the modern Alfa Romeo 75. Whichever model you prefer, both 75s have an impressive physique with a spectacular bodykit. Wide tracks, spoilers, skirts, bumper vents. That's what a 75 DTM would look like! The 75 IMSA M uses the same black rims as the IMSA of the 1988 Giro d'Italia, while the Busso 4.0-liter adopts “turbine”-type metal-gray rims.
In both cases, these are not mere preparations, but real developments that Alfa Corse might have thought up had the 75 seen its sporting career extended. These projects perfectly illustrate the concept of extreme restomod, combining classic design with modern chassis, transmission and powertrain technologies.
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