Who makes toyota motors?

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2007 Toyota Tundra Car Reviews - The Car Connection


The brilliant stuff



Two of the three engines available on the new Tundra are slightly tweaked versions of familiar engines installed in the outgoing Tundra. The third engine is new from crankcase to throttle body and probably the finest gasoline-fired V-8 ever installed in a pickup. And the world is full of great truck engines.



Base powerplant for the new Tundra is a version of Toyota's DOHC, 24-valve, aluminum block and heads, 4.0-liter V-6 which, in part thanks to VVT-I variable valve timing, is rated at 236 horsepower at 5200 rpm and a peak 266 pound-feet of torque at 4000 rpm. The entry level V-8 is Toyota's, DOHC, 32-valve, iron block, aluminum heads 4.7-liter V-8 which, in part thanks to VVT-I variable valve timing, is rated at 271 horsepower at 5400 rpm and a peak 313 pound-feet of torque at 3400 rpm. Both these engines are sweet natured in their power delivery, smooth in their operation and relatively efficient in their use of fuel. And both come lashed to a standard, perfectly mannered five-speed automatic transmission.



It's the biggest engine that impresses the most however. Branded as the iForce 5.7 to the public, it's known as the 3UR-FE within Toyota. Designed around the same structural architecture as the "1UR-FSE" 4.6-liter V-8 used in the Lexus LS 460 that was introduced last year and assembled at Toyota's plant in Huntsville, Alabama, this is Toyota's first aluminum block and aluminum head truck V-8. It's also the most American truck engine the company has built with the aluminum engine blocks and heads cast by Bodine Aluminum (owned by Toyota) in Troy, Missouri.



Like the Lexus 1UR-FSE, the 3UR-FE features cast-in iron cylinder liners, dual overhead cams, four valves over every cylinder and VVT-I variable valve timing on both the intake and exhaust valves. However while the Lexus engine uses direct fuel injection, the Tundra engine uses conventional fuel injection. But the big difference is, naturally, displacement. Both engines have 94-millimeter cylinder bores, but the Lexus engine's stroke is a short 83 millimeters while the Tundra engine's stroke is a long 102-millimeters. It's that long stroke that has the I-Force 5.7 making 401 pound-feet of peak torque at 3600 rpm while the LS 460's engine makes it's 367 pound-feet of peak torque at a dizzier 4100 rpm.



On top of all that throw in technologies like an "Acoustic Control Induction System" that uses butterfly valves inside the intake manifold that in two stages can adjust the length of the intake tract based on throttle position and engine speed, tubular stainless steel headers feeding an stainless exhaust system, and the result is a total of 381-horsepower. That makes the I-Force 5.7 the most powerful engine ever sold by Toyota in North America… car, truck or forklift. It beats the LS 460's 1UR-FSE by a whole horsepower.



There are a lot of excellent truck engines out there - the 315-horsepower, 5.3-liter Vortec V-8 in the Chevy Silverado, 317-horsepower, 5.6-liter Endurance V-8 in the Nissan Titan and the 345-horsepower, 5.7-liter HEMI V-8 in the Dodge Ram to name three - but the Tundra's I-Force 5.7 has them covered with more power, an utterly seamless delivery of that power, and eerily creamy smoothness that's almost spooky in its Lexus-ness. Then on top of that Toyota pushes the new engine's advantage by pairing it with a standard six-speed automatic transmission.



Using advanced manual counting technology (one-one thousand, two-one thousand, three-one thousand) during the press introduction of the new Tundra, a two-wheel-drive 5.7-equipped Regular Cab Short Bed ripped from 0 to 60 in just about six seconds flat. Except for high-performance sport trucks like the Ford SVT Lightning and Dodge Ram SRT-10, the new Tundra is likely the quickest factory pickup ever built. And unlike the SRT-10 or Lightning, it retains all the usefulness a truck should have while being blisteringly quick.



The combination of the I-Force 5.7 and the six-speed automatic transmission is simply… brilliant.