Tesla's Nurburgring run revs up debate over speed records

Tesla's attempts to humble Porsche with a new lap record on Germany's legendary Nürburgring Nordschleife racetrack have reignited a controversy about the value of lap times, as the circuit steps in to quash claims of cheating. Porsche and Tesla are battling to establish supremacy in lap times for four-door electric performance cars, but comparisons are not exact, as conditions, ranging from car modifications to tire types, vary with each test. "We want to have circumstances that can be understood and replicated," said Nürburgring spokesman Alexander Gerhard, adding that the racing circuit operator had moved to tighten rules by which a carmaker can claim a certified lap time.