Dauer 962LM

One of the most spectacular supercars ever built was Dauer 962 LM. Some supercars were converted to race use, some were designed with racing purpose very much in mind, but the Dauer 962 LM was completely reversed - it was a racing car converted for road use. No wonder it could out-performed McLaren F1 and simply anyone else.
Performance

The engine was the Le Mans spec 2994cc watercooled flat-six with twin-cam per bank operating 4 valves per cylinder. Twin KKK turbochargers with individual intercoolers. Bosch Motronic 1.7 engine management system controlled the ignition and injection. With an extraordinarily-high compression ratio of 9.0:1, the engine output an astonishing 730 hp at 7,600 rpm and 517 lbft at 5,000rpm. That translated to an astonishing 240hp per litre ! How could Dauer do that? considering a 1996 Porsche 911GT1, whose engine was also derived directly from the 962's racing unit, managed only 172hp per litre, Dauer's figures were not without questions.

People doubted not only its power rating, but also the performance claims - Dauer said the car could accelerate from standstill to 100km/h (62mph) in merely 2.6 sec, and then arrive 200km/h (124mph) in 7.2 sec. As for top speed, 251 mph could put it to the top of the world, beating McLaren F1 by 11 mph.

After years of doubt, Dauer 962LM finally hit 251.4mph (404.6km/h) at Volkswagen's Ehra Lessien test track in November 1998. It should put an end to the debate. However, doubters could still question whether the test car got over-boost that did not comply with European emission regulations. After all, a race-bred engine should be easy to revert to racing spec.

If the road-going Dauer 962 LM really possessed 730 horses on tap, the aforementioned top speed and acceleration would have been in no question, because the car weighed only 1080 kg and had an excellent aerodynamic drag at merely 0.31, which was easily achieved in wind-tunnel work by removing the excessive downforce from the Porsche race car. A typical Porsche 962 race car had a Cd at least 0.40, but its tremendous downforce enabled it to corner at nearly 200 mph. As the road car had only 40% downforce of the racing 962, Dauer transformed that to higher top speed.