LONDON, England - Red Bull Formula 1 team owner Dietrich Mateschitz has told the auto-racing world: "The only missing link in Red Bull's title campaign for 2014 is a state-of-the-art engine."the answer, he added, was for the team to build its own engine."Our cars are again 'state of the art' but proving this will require a perfect power unit in terms of hardware and software."STRAINED RELATIONSHIP The relationship between Red Bull and Renault has often been strained, even in the midst of the reigning quadruple F1 champion team's successes. Given the problems now, Mateschitz was asked if Red Bull saw any alternative to working with Renault.He replied: "Probably just to make an engine ourselves. I'm confident this process will be fast and that we can catch Mercedes by the Bahrain race. There's no reason to think that this (winning the 2014 title) is not still our goal."Mateschitz even tipped Sebastian Vettel - who has shown signs of frustration so far in 2014 - to ride out the storm with Red Bull. "For-four-and-a-half of his five years with us he has had a car with which he could win. He has more than enough character, professionalism and loyalty to overcome this phase."Stay with Wheels24 for the 2014 F1 season – fresh reports every day.