Making of Acura Type S Turbo V6 Acura TLX Type S
Highly-anticipated 2021 Acura TLX Type S arrives at dealerships nationwide tomorrow
New video showcases Acura’s new Type S Turbo V6 engine created exclusively for the 2021 Acura TLX Type S and the upcoming 2022 MDX Type S
Compact in design, the turbocharged 3.0-liter DOHC V6 engine builds on decades of performance engine expertise and incorporates technologies from the NSX supercar
After more than a decade, Acura’s Type S performance line triumphantly returns as the brand continues to sharpen its focus on Precision Crafted Performance. Previously available on select models from the 2001-2008 model years, Type S is recognized by driving enthusiasts who seek a more dynamic driving experience with more power, improved handling and stronger braking. With the Type S Turbo V6 and Super Handling All-Wheel Drive™ with true torque vectoring, the TLX Type S takes this philosophy to new heights.
Type S Turbo V6 Engine
Exclusive to Type S models, the Type S Turbo V6 features all-aluminum construction, compact dimensions, dual overhead camshafts, 24-valves, direct injection and a single twin-scroll turbocharger. Its block is unique, sharing only bore spacing and a 60-degree angle with the highly-regarded 3.5-liter V6 that has powered various Acura models. Significant differences between the two include the 3.0-liter’s 6-bolt sintered main caps for increased crank rigidity and durability and a fully square 86 mm bore and stroke.
Numerous engineering steps were taken to ensure the new engine’s compact size and low profile that enabled it to fit in the TLX engine room. This includes the placement of the turbocharger adjacent to the engine above the transmission and the use of low-profile cylinder heads. Separate cam bearing caps have been replaced by caps directly incorporating into the valve cover itself, lowering the engine’s height and reducing the number of parts. Fully assembled, the engine is 8 mm shorter than the naturally aspirated 3.5-liter V6.
Featuring a robust rotating assembly to meet the demands of extreme performance and durability, the Type S Turbo V6 employs a high-stress forged steel crankshaft and forged steel connecting rods. To help reduce emissions, the top piston ring carrier of its pistons is a high-density Ni-resist cast iron, which features better wear characteristics and better sealing.
Single Twin-Scroll Turbocharger
The Type S Turbo V6 employs a single twin-scroll turbocharger, which is fed exhaust pressure by the rear and front cylinder banks through independent internal paths. Turbo lag is minimized, and throttle response is optimized as the engine’s rear bank of cylinders pressurizes the smaller diameter scroll of the turbo’s turbine, while the front bank feeds the larger diameter.
For quick turbo response, the exhaust manifold is cast directly into the cylinder head itself and to improve the engine’s torque characteristics, Variable Timing Control™ (VTC™) is used on both intake and exhaust cams. With maximum boost of 15.1 psi, the engine’s 354 lb.-ft. of peak torque is available starting from an exceptionally low 1,400 rpm.
Variable Cylinder Management™
A primary goal of the new Type S Turbo V6 was to implement Variable Cylinder Management™ (VCM™) to improve fuel efficiency and reduce emissions. VCM™ operates the engine with three cylinders in a wide range of situations, switching seamlessly to six-cylinder operation when more power is needed. To prevent pumping losses, the engine’s Electronic Control Unit (ECU) closes the valves on the inactive cylinders. On the SOHC 3.5-liter engine, this is accomplished by using VTEC®, which locks the rocker arms activating the valves together to prevent the valves from opening when VCM™ is active.
Active Vibration Control
To maintain smooth operation when VCM™ is engaged, new engine mounts and Active Vibration Control (AVC) are used. Unique to the Type S Turbo V6, AVC cancels out vibrations from the chassis as well as the engine, making the operation of VCM™ almost imperceptible to the vehicle’s occupants.
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