Red Bull and engine supplier Renault face a crucial four days in the final pre-season test in Bahrain. They suffered a disastrous time in the first two tests and are running out of time to be ready for the start of the new season in Australia on 16 March. The Red Bull car has hit a series of reliability problems and Renault's new turbo hybrid engine is lagging behind rivals Mercedes and Ferrari. Renault has admitted it is 'some weeks behind where we wanted to be'. Renault Sport deputy managing director (technical) Rob White added: 'We are not back on schedule but we are moving in the right direction. 'The challenge is to improve the rate of progress, because the gap to where we wanted to...
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