An engineer for Red Bull's engine supplier Renault claims theories of cheating by the championship-leading team make "no sense".

In recent weeks there has been a wide range of theories and speculation about possible cheating by Sebastian Vettel and Red Bull, most of which claim the RB has a clever traction control style system.

On Wednesday the newest claims was Red Bull is using it's KERS to generate a kind of traction control system which would be legal under the current rules, however Renault's Ricardo Penteado believes those claims are well off the mark.

"Everything is checked by the FIA," he told Brazil's O Estado de S.Paulo newspaper. "The electronic control unit is distributed by the FIA itself, to ensure that all the (electronic) programmes are in compliance with the rules.

"It would be foolish to try to do something illegal," Penteado insists. "It would end your credibility, the team would be excluded -- it makes no sense."

Indeed a current Williams employee who has previously worked with Red Bull's Adrian Newey also dismisses the speculation.

"I know their designer (Newey) well," the unnamed team member told the newspaper.

"He has a group studying each area of the regulations in detail, in order to take advantage of anything that could give some additional speed.

"I just think that is what we are seeing now," he added.

Meanwhile another F1 insider, technical illustrator Giorgio Piola believes the advantage Vettel has over the rest of the grid is simply down to upgrades Newey brought from the Spa race in August.

"The Newey car that debuted at Spa, when the winning streak began, was very different to the previous version," said Italian Piola.

"Wings, floor, how it uses the exhaust gases, this new version of the RB9 was designed for the characteristics of the new Pirelli tyres.

"They (the Pirelli tyres) are very different from the earlier ones, but the other (teams) only made subtle adjustments to their cars," Piola added.

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