Former team owner Gian Carlo Minardi has questioned the legitimacy of Sebastian Vettel's win in Singapore claiming he saw and heard evidence of traction control on the Red Bull.
The Italian was at the Singapore GP just over a week ago and says he was surprised how Vettel, who only just beat his rivals in qualifying, was able to be at some points two seconds quicker per lap at Marina Bay.
"It's not my intention to devalue Sebastian Vettel, who always manages his Red Bull in the best way," he told his website.
"I just want to tell what I personally saw and heard during the three day event," Minardi explained.
Referring to the stretch between turn's 8 and 9, the first chicane type section of the circuit, Minardi said Vettel was able to negotiate the tricky traction zone "without making any corrections, unlike all his rivals and also his teammate" Mark Webber.
"His laptime was also remarkable in T3, which is the track's sector with the highest concentration of corners," he added.
"On the same stretch, Sebastian was able to speed up 50 metres before any other driver, Webber included."
It was not only the handling of the Red Bull that was concerning Minardi.
"The thing that surprised me the most was the engine's sound," he said.
"It sounded like none of the other Renault engines on track, including Mark's. It sounded similar to the engines in past seasons when traction control went into action.
"Furthermore, that sound was only heard when Vettel chalked up his excellent performances," added Minardi. "For example, after the safety car went in. In those moments it was more powerful (sounding) than any other engines -- Renault and the other brands.
"I would like to have some answers," he continued. "I don't want to blame anyone, I just want to get to the bottom of it."
This is not the first time the issue of legitimacy of the Red Bull has been called into question, in Canada Mark Webber's car was also under scrutiny after tyre markings left on the track during the race were consistent with those seen when traction control was in use.
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