Wednesday 16 April at 11:49 : Toro Rosso's new car, the STR3, will be tested publicly for the first time in Barcelona on Wednesday.

But Gerhard Berger, the team's co-owner, has denied reports in Switzerland that the single seater is to be fitted with what Motorsport Aktuell refers to as a 'miracle' Ferrari engine.

It was suggested that a revised Maranello built V8 engine that debuted in the works team's cars in Malaysia is now ready to benefit Ferrari's two customer teams, Faenza based STR and Force India.

But Berger said of the rumours that the new engine boasts 25 horse power more grunt: "If that is true, then it is not in our car.

"I can not imagine that," he added.

The STR3, designed by Red Bull Technology and based on the Renault-powered RB4 already in use by Red Bull Racing, is scheduled to debut at the Turkish grand prix.

Following its private shakedown at Vairano recently, it will be debuted properly for the first time by Sebastien Bourdais at the Circuit de Catalunya on Wednesday.

The Frenchman's teammate, Sebastian Vettel, will drive it on the final day of the test on Thursday.