Honda Performance Development HR35TT twin-turbo V6 engine

Honda’s versatile production V6 will be the foundation for another race-only bullet when the HR35TT twin-turbo V6 runs in the Tudor United Sportscar Championship this season. The engine will debut in the 12 Hours of Sebring mounted in a Riley Gen3 prototype chassis from the Starworks Motorsport garage. Starworks previously used the HR28TT, another twin-turbo V6 from Honda Performance Development, in a LMP2 car raced during the 2012 WEC series.

HPD HR28TT engine

Both engines are derived from Honda’s J35 production engines. Key features of the HR35TT include steel crankshaft and rods, dry sump oiling, direct fuel injection and HPD/McLaren engine management.

The Honda engine is the second twin-turbo engine approved for Daytona Prototype cars following the introduction of a 3.5-liter Ford EcoBoost engine. Other DP engines include BMW and GM naturally aspirated V8s. This is also the first year that the DP cars will be grouped with LMP2 cars and the Nissan Delta Wing from the old ALMS series.

“We have had numerous conversations over the past two years about building a Daytona Prototype motor and we’re thrilled to see it come to fruition,” says Peter Baron, owner of the Starworks team.

Other variants of the HPD V6 race engine have competed in Japan’s Autobacs SuperGT Championship, the One Lap of America competitive rally and Pikes Peak International Hillclimb. Honda also races a 2.2-liter twin-turbo V6 in the IndyCar series, and recently released a HR22T sportscar version of that platform for use in LMP1 cars.