Mercedes-Benz CLK GTR: The 128-Day Miracle
The late 1990s was the golden era of the GT1 homologation special. The rules laid out by the FIA required manufacturers to build a minimum of 25 road-legal examples of a car in order to race it in the FIA GT Championship. While Ferrari and McLaren modified existing road cars (the F40 and F1) for the track, Porsche had changed the game in 1996 by building a mid-engine prototype (the 911 GT1) and then building a few road cars to satisfy the rules.
Mercedes-Benz, seeing Porsche dominating, decided they needed to compete. However, they had nothing in their lineup that could match the 911 GT1. So, in late 1996, they handed the project to their performance division, AMG, and gave them a seemingly impossible deadline: build a brand-new race car and homologate it for the road in time for the 1997 season.
In just 128 days, going from a blank sheet of paper to a functional race car, AMG created the Mercedes-Benz CLK GTR. It is arguably the most extreme, cynical, and glorious racing program manipulation in Mercedes-Benz history.
The Design: A Facade of Familiarity
To call the CLK GTR a “CLK” is one of the greatest automotive lies ever told. Mercedes-Benz wanted the car to resemble their new mass-market CLK coupe for marketing purposes. To achieve this illusion, AMG fitted the race car with the grille, headlights, and taillights of the standard CLK.
Everything else was pure Le Mans prototype. Underneath the carbon fiber bodywork, there was no shared DNA with the road car. The chassis was a bespoke central tub constructed from a carbon fiber composite and aluminum honeycomb—a technique pulled directly from Formula 1.
A steel roll cage was integrated into the roof, and the engine was mounted amidships, functioning as a stressed member of the chassis (meaning the rear suspension bolted directly to the engine and gearbox casing, saving weight and increasing rigidity).
The bodywork was an exercise in extreme aerodynamic efficiency. It was incredibly low, incredibly wide, and incredibly long. It featured a massive front splitter, deep side skirts, an enormous roof scoop to feed the V12, and a gigantic rear wing integrated directly into the rear clamshell. It was a race car through and through, complete with pneumatic jacks built into the floor.
The M120 V12: A Symphony of Displacement
To power the CLK GTR, AMG turned to a proven workhorse: the M120 V12 engine. Originally found in the S600 luxury sedan, the M120 was a robust, naturally aspirated, all-aluminum, 60-degree V12 with double overhead camshafts and four valves per cylinder.
However, for the CLK GTR (both the race car and the Straßenversion road car), the engine was heavily modified. In the road cars, the displacement was increased from 6.0 liters to a massive 6.9 liters (6,898 cc).
Because the road cars did not have to run the strict air restrictors mandated by the FIA GT regulations for the race cars, the street-legal CLK GTR was actually more powerful than the race car that won the championship. The 6.9-liter V12 produced 612 PS (604 hp) at 6,800 rpm and a locomotive-like 775 Nm (572 lb-ft) of torque at 5,250 rpm.
The engine was mated to a 6-speed sequential manual transmission mounted longitudinally behind the rear axle. There was no clutch pedal; the clutch was operated automatically by the transmission control unit when the driver pulled the small paddles behind the steering wheel (a very early implementation of paddle-shift technology).
The Straßenversion (Street Version) Experience
To meet the homologation requirement, Mercedes-AMG and their partner HWA (founded by AMG co-founder Hans Werner Aufrecht) eventually built 26 road-legal cars (20 coupes and 6 roadsters).
Driving a CLK GTR Straßenversion is a bizarre experience. The doors open upwards and forwards (similar to a McLaren F1). To get into the driver’s seat, you must negotiate a massively wide carbon fiber sill.
Once inside, the illusion of a luxury Mercedes quickly vanishes. The seats are little more than thin pads attached directly to the carbon tub. The steering wheel is small, covered in suede, and detachable (like a race car). The noise insulation is practically non-existent.
When the 6.9L V12 fires up, the vibration shakes the entire chassis. The transmission, being a true sequential racing box, clunks violently into first gear. The suspension is pushrod-actuated and incredibly stiff. The turning radius is comically large, and rear visibility is literally zero (forcing AMG to rely on side mirrors and careful planning).
However, on an open road or a racetrack, the CLK GTR is a weapon. It accelerates from 0 to 100 km/h (62 mph) in 3.8 seconds and reaches a top speed of 344 km/h (214 mph). But it is the aerodynamic grip that defines the car. The faster you go, the harder the car is pushed into the tarmac. The steering, unassisted and heavy at low speeds, becomes incredibly communicative, allowing the driver to place the wide nose with millimeter precision.
The Racing Dominance and the Flipping Incident
The CLK GTR achieved exactly what Mercedes-Benz intended. In 1997, it dominated the FIA GT Championship, winning the team and driver titles (with Bernd Schneider) and easily defeating the Porsche 911 GT1 and McLaren F1 GTR. It won the championship again in 1998 with an upgraded version featuring a V8 engine (the CLK LM).
However, the CLK GTR’s legacy is forever tied to a spectacular aerodynamic flaw discovered in its successor, the CLR, at the 1999 24 Hours of Le Mans. Due to a combination of a short wheelbase, long overhangs, and extreme pitch sensitivity, three separate CLRs caught air under their noses and literally took off, performing terrifying backflips at over 200 mph. While the CLK GTR road cars do not suffer from this issue at legal road speeds, the imagery of the flying Mercedes prototypes remains etched in motorsport history.
The Most Expensive Production Car
When the road cars were finally delivered to customers in 1998 and 1999, they carried a Guinness World Record price tag: $1,547,620. At the time, it was the most expensive production car ever built.
Today, the Mercedes-Benz CLK GTR is one of the most coveted collector cars in the world. It represents an unrepeatable era of motorsport, where manufacturers went to absurd lengths, spent unlimited budgets, and built actual Le Mans prototypes just to legally put a license plate on 25 of them. It is loud, uncomfortable, impractical, and absolutely magnificent.