Honda HR35TT engine

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Honda HR35TT engine
Acura AR35TT engine
[1]
Overview
Manufacturer Honda Performance Development
Production2014–
Layout
Configuration V6, twin-turbocharged, 60° cylinder angle
Displacement 3.5 L (3,500 cc)
Cylinder bore 89 mm (3.50 in)
Piston stroke 93 mm (3.66 in)
Cylinder block material Aluminium
Cylinder head material Aluminium
Valvetrain 24-valve (four-valves per cylinder), SOHC
Compression ratio 11.5:1
Combustion
Fuel system Gasoline direct injection
Management HPD/McLaren
Fuel typeVP Racing Fuels E10 100-101 octane gasoline + 10% ethanol
Oil system Dry sump
Cooling system mechanically water cooled
Output
Power output 600  hp (447  kW; 608  PS) @ 8,500 rpm
Torque output 500  lb⋅ft (678  N⋅m) @ 6,000 rpm
Chronology
Predecessor Honda HR28TT

The Honda HR35TT engine (also called the Acura AR35TT) is a twin-turbocharged, four-stroke, 3.5-liter, V6 racing engine, designed and produced by Honda Performance Development (HPD) for use in multiple race cars, from 2014.

Contents

Design

The HR35TT, like its predecessor HR28TT, is derived from the production J35 family of engines found numerous Honda/Acura production vehicles. [2] It features steel crankshaft and rods, dry sump oiling, direct fuel injection and HPD/McLaren engine management. [3] The HR35TT is designed to produce roughly 600  hp (450  kW ) at 8,500 rpm and 500  lb⋅ft (680  N⋅m ) at 6,000 rpm. [4] The engine made its debut at the 2014 12 Hours of Sebring in a Starworks Motorsport-run Riley MkXXVI. [5] When it was used in the Acura ARX-05, it was dubbed the AR35TT. [6]

Applications

References

  1. ↑ "Honda HR35TT Twin-Turbo V6 engine". hondaracing-us.honda.com. Retrieved January 10, 2026.
  2. ↑ "Acura Reveals Striking ARX-05 Prototype Race Car in Monterey; Debut Set for Daytona". Acura Newsroom. August 18, 2017. Archived from the original on January 11, 2026. Retrieved January 11, 2026.
  3. ↑ Magda, Mike (February 24, 2014). "Honda Builds 3.5-liter Twin-turbo V6 for Daytona Prototype Cars". EngineLabs. Archived from the original on November 29, 2025. Retrieved January 11, 2026.
  4. ↑ "Acura ARX-05 specs, lap times, performance data". FastestLaps.com. Archived from the original on October 9, 2025. Retrieved January 11, 2026.
  5. ↑ "HPD Unveils 3.5 Liter Prototype Engine". hondaracing-us.honda.com. February 20, 2014. Archived from the original on January 11, 2026. Retrieved January 10, 2026.
  6. ↑ "How Acura Turned a Minivan into an IMSA Prototype". THE SHOP. October 4, 2019. Archived from the original on October 14, 2019. Retrieved January 11, 2026.
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