How much does the roof down affect the speed of the car? Paul Maric from the YouTube channel CarExpert tried to answer the question. He lined up two Porsche models, the 911 Turbo Coupe and the 911 Turbo Cabriolet.

Both models are powered by a 3.8-liter twin-turbo flat-six engine with 572 hp (421 kW) and 553 lb-ft (750 Nm) of torque. They are equipped with an eight-speed double clutch automatic gearbox that transmits power to all wheels.

The first test was at the 1/4 mile where the 911 Turbo Coupe achieved a time of 11.4 seconds at 206.3 km / h and reached 62 mph in 3.7 seconds. The 911 Turbo Cabriolet (Roof Up) achieved a time of 11.5 seconds at 207.5 km / h and reached 62 mph in 3.7 seconds.

Test 2 (Roof Down) – At 1/4 mile both models had the same time of 11.1 seconds. The 911 Turbo Coupe reached 62 mph in 3.3 seconds, while the 911 Turbo Cabriolet reached 62 mph in 3.2 seconds.

Test 3 (Roof On) – They equalized the weight of both cars, since the Babriolet is 20 kg heavier than the Coupe. This time, at 1/4 mile the Coupe achieved a time of 10.9 seconds and reached 62 mph in 3.1 seconds. The 911 Turbo Cabriolet achieved a time of 10.8 seconds and reached 62 mph in 3.0 seconds.

Test 4 (Roof Off) – 911 Turbo Coupe achieved a time of 11.0 seconds at 206.6 km / h and reached 62 mph in 3.1 seconds. The 911 Turbo Cabriolet achieved a time of 10.8 seconds at 208.2 km / h and reached 62 mph in 2.9 seconds.

Test 5 – They swap lanes and this time the Coupe was faster with 10.8 seconds, while the Cabriolet achieved a time of 11.1 seconds.

How relevant this was, we’re not sure. Maybe some other tests would show more accurate results. One thing is for sure, it was interesting to watch.

Source: CarExpert via YouTube