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A Pair of Powerful Powertrains

The all-new Toyota Tundra will offer two powertrain options: a twin-turbo V6 engine and a hybrid twin-turbo V6. What may be surprising to some is the hybrid powertrain will be the most powerful of the two. Mated to both engines will be a 10-speed Electronically Controlled Automatic Transmission with intelligence (ECTi). The new 10-speed features a sequential shift mode, uphill/downhill shift logic and TOW/HAUL driving modes.

Calling the twin-turbo V6 a "base" engine just doesn't seem right. Its aluminum block features a displacement of 3,445cc via an 85.5mm bore and 100mm stroke. The 24-valve, Dual Overhead Cam V6 is chain-driven and features Dual VVTi systems. Thanks to the water-cooled intercooler keeping turbo temperatures down, the V6 engine improves on the outgoing V8 engine in every way with impressive performance figures: 389 horsepower and 479 lb.-ft. of torque.

Next-level enhancements help make this twin-turbo V6 stand alone at the top of the powertrain mountain. Engineers developed state-of-the-art cylinder heads for max-boost reliability with a two-layer water jacket structure for maximum coolant flow and combustion chamber strength and then added machined cross-channels for additional combustion chamber cooling. Low-profile, laser-applied powder-metal intake valve seats enhance the intake port efficiency and allow maximum coolant flow close to the spark plug.

Exhaust cooling starts with the computer-optimized exhaust valve shape and is further enhanced by the integrated exhaust manifold and cylinder head design that uses the same water jacket to lower exhaust gas temperature entering the turbochargers to further improve reliability and performance.

The cylinder heads themselves have machined cross-channels to allow coolant to flow through them laterally to provide additional cooling to the combustion chambers. This also contributes to cylinder head reliability and operating efficiency. The exhaust valves' shape has also been optimized to enhance cooling performance.

Drumroll, please! The showstopper for Tundra is really the i-FORCE MAX powertrain. The numbers alone are jaw-dropping - 437 horsepower at 5,200 rpm and a staggering 583 lb.-ft. of torque at only 2,400 rpm. The numbers are impressive, but how this beast achieves them is the best part.

The new i-FORCE MAX relies on the same twin-turbo V6 platform but features a unique attribute - a motor generator with a clutch located within the bell housing between the engine and 10-speed automatic transmission. In essence, the motor generator is built in-line to provide additional power that is transferred efficiently via the transmission, while the engine start-up, EV driving, electric assist and energy regeneration are solely done via the parallel hybrid components.

The i-FORCE MAX powertrain is designed to provide maximum performance and maximum efficiency at every extreme. During towing applications, the hybrid system provides additional power and torque. In city driving, it offers a quiet ride with improved efficiency while in low-speed EV mode. On the highway, responsive linear power delivery is the name of the game, and off-road driving is further enhanced thanks to peak torque performance being achieved low in the RPM range.

A newly developed Power Control Unit (PCU) is used to achieve excellent battery durability and thermal performance with a focus on drive performance. The system employs a tried-and-true 288V sealed Nickel-Metal Hydride (Ni-MH) battery that resides under the rear passenger seats.

Using the SPORT or SPORT+ settings under Drive Mode Select, i-FORCE MAX makes use of the electric motor's instantaneous responsiveness. Although the electric motor does the bulk of the work at lower speeds, once above 18 mph, the gasoline engine is constantly in operation for excellent performance in the mid- and high-speed range. When in TOW/HAUL mode, the i-FORCE MAX system is constantly in operation to provide impressive acceleration and torque for towing needs.

Standard on TRD Pro models and available on 4×4 trucks equipped with the TRD Off-Road package are a slew of off-road upgrades that enhance off-pavement exploration. Multi-Terrain Select offers adjustable settings to help control wheel spin on a variety of terrain. CRAWL Control functions as a low-speed, off-road cruise control that allows the driver to focus on steering while it maintains one of five selectable speeds. Downhill Assist Control is another off-road feature that helps the driver navigate tricky slopes by limiting the speed of the vehicle during descent.

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Originally posted by lkdr1989:
I think base trim is $38,000 and the TRD Pro is going to be $51,000 but quite frankly, if they raise the prices 12-15%, I wouldn't be surprised.

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Originally posted by ArtieS:
I imagine it will be expensive, as good Toyota's tend to be, and hopefully it will have Toyota's expected reliability. Maybe give the new engine and transmission combination a year or two before buying, but I think this is where trucks are going.