HPD technical director Roger Griffiths says that Honda would have been forced to go down the twin-turbo route with its next-generation IndyCar engine even if that configuration had not been mandated by the series. IndyCar confirmed last week that manufacturers would be compelled to use BorgWarner twin-turbo systems for 2014....

HPD technical director Roger Griffiths says that Honda would have been forced to go down the twin-turbo route with its next-generation IndyCar engine even if that configuration had not been mandated by the series.IndyCar confirmed last week that manufacturers would be compelled to use BorgWarner twin-turbo systems for 2014. This...