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.
The HR35TT, like its predecessor HR28TT, is derived from the production J35 family of engines found in numerous Honda/Acura production vehicles. It features steel crankshaft and rods, dry sump oiling, direct fuel injection and HPD/McLaren engine management. The HR35TT is designed to produce roughly at 8,500 rpm and at 6,000 rpm. The engine made its debut at the 2014 12 Hours of Sebring in a Starworks Motorsport-run Riley MkXXVI. When it was used in the Acura ARX-05, it was dubbed the AR35TT.