RENNtech SLR 74
With the SLR7.4 the target was to deliver an extraordinary car that could run with the fastest sports cars and maintain a low-key appearance around town. The result was the Emerald Green “wolf in sheep clothes” RENNtech SLR7.4.
The car was a spare-no-expense build for a customer who already owned two RENNtech cars from before. The car had to meet the high expectations set by the customer and by the benchmark cars of the era; the SL 73 AMG, Viper GTS, and Porsche Turbo. A comfortable convertible that would outperform the fastest sports cars and make daily drives around town without a fuss. Performance, handling, appearance, and reliability had to be perfect and without compromise.
To bring out additional power from the M120 we started by increasing the bore to 91 mm and stroke to 95 mm. We added a custom billet crankshaft, titanium connecting rods, and Kolbenschmidt pistons. This resulted in a 7.4 liter displacement giving it the moniker SLR7.4
(The SLR part came from Sport Light RENNtech)
New high-lift camshafts were made from Mercedes-Benz blanks and 48 larger, longer, and lighter valves were sourced from the Judd F1 team in England. The engine required additional clearance, so we built a custom hood out of carbon fiber. This reduced weight and allowed us to create louvers for airflow while adding space for the engine manifold. The seats were changed to Recaro’s, and re-upholstered to match the custom dash with carbon-fiber inserts replacing all the original wood trim.
A RENNtech stainless steel exhaust and K&N filters were added for optimal exhaust flow and air intake. The original adaptive shocks were replaced with fully adjustable Konis, and higher-rate springs and sway bars were added for stability and handling. To cancel out the “toe-in” we built new suspension links for the rear.
