Sebastien Bourdais on Tuesday said there is no immediate end in sight to the problems he is experiencing at the wheel of the latest Toro Rosso chassis.

The French driver, a multiple title winner in recent years of the American open wheel category Champ Cars, has since the introduction of the STR3 struggled to match the pace of his highly-rated young teammate Sebastian Vettel.

"I do not feel very good with this car," Bourdais is quoted as saying by the French-language 'RMC'.

"There is no technical solution," he goes on. "It is a characteristic of the car that does not fit with me at all."

The STR3 is a Ferrari-powered version of the Adrian Newey-penned car also raced at grands prix by senior team Red Bull Racing.

"The problem is that, of the four drivers, I am the only one complaining (about this issue), and at Toro Rosso it is not for us to talk about the (car's) development," Bourdais, 29, said.

Source: GMM