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Red Bull design guru Adrian Newey faces the new Formula One season lamenting the FIA's latest rules revisions he fears could put his team on the backfoot.

Newey's cars have enabled the team and driver Sebastian Vettel to become world champions over the past two years, with last season a particularly dominant one.

The 24-year-old German secured a new record for pole positions in a year (15), helping him to win 11 of the 19 grands prix en route to taking the title with four races to spare.

One of the strengths to the car was the exhaust blown diffuser, a device that created additional downforce, but for this season has been banned by motorsport's governing body.

The rule change has tested Newey's design skills to the limit and he is in the dark as to how the car, the RB8 revealed yesterday, will fare when it hits the track today for the first day of pre-season testing in Jerez.