Ride through a foggy Mazda Raceway Laguna Seca with Zak Brown in a visor cam session in his 800hp twin-turbo flat-6 Porsche 935 JLP-3.

Ride with Ozz Negri as he pushes Michael Shank Racing's twin-turbo Honda V6-powered Ligier P2 prototype around Daytona international Speedway during IMSA's November test.

Ryan Hunter-Reay admits he had concerns about his Andretti Autosport team's off-season switch from Chevrolet to Honda power for the upoming IndyCar season. But he says that he is now optimistic about the Japanese manufacturer's efforts to master its twin-turbo unit.Honda will join rival Chevrolet in using a twin-turbo layout...

RACER's ongoing chronicle of Honda Performance Development's efforts to bring a Daytona Prototype version of its P2 engine has finally reached the point where the manufacturer will unveil the car on Thursday during IMSA's two-day test at Sebring International Raceway.Peter Baron's Starworks Motorsport, winners of the 2012 WEC P2 title...

IndyCar announced Thursday that all engines supplied to IZOD IndyCar Series teams will utilize only twin turbocharger systems beginning with the 2014 season.The decision, which was confirmed following a meeting the series' Engine Committee meeting, is intended to further strengthen engine parity. It also dovetails with the manufacturers' first homologation...

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...