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Toyota 5VZ-FE, a 3.4L V6 motor, was first produced in 1995 as a modified version of 3VZ-FE. It was meant for the brand’s SUVs and off-road vehicles.
Keeping the cast iron cylinder block like its predecessor, 5VZ-FE features a larger bore for 3.4L capacity instead of 3.0L. The motor has a V-shaped configuration with 60-degree cylinders angle. In order to achieve the compression index of 9.6, restyled pistons were applied. The aluminum cylinder heads with dual overhead camshafts comprise 4 valves per each cylinder on the upper part of the block.
Actually, they are almost identical to the ones of 3VZ-FE and have only some minor alterations. However, the camshafts are absolutely different. 5VZ-FE camshafts were adjusted for more torque down low in comparison with 3VZ. Thus, less maximum torque is provided while soft plane curve all over the range is reached. A timing belt controls camshafts.
The motor was provided with fresh intake manifold with longer runners, producing maximal torque at low and middle rpm. The sequential multiport fuel injection was applied instead of the classic one. Moreover, the engine received a modernized ignition system. Updates of the exhaust manifolds brought more torque. 5VZ features oil cooler and high-productive coolant fan for the overheating prevention while driving off-road.
Actually, this motor turned out to be an outstanding option for Toyota’s off-road vehicles, pickups and trucks. In 2004, 5VZ-FE was discontinued and substituted with 1GR-FE motor.
If you want to reach a greater output of the motor, you are free to acquire a supercharger. The choice of bolt-on kits is pretty large. For instance, you may purchase TRD supercharger kit, which employs an Eaton M62 supercharger. However, you will need to change the original fuel injectors for the ones from a 3JZ-GE motor or other performance injectors for increased fuel use.
Thus, you may reach 250-280 horsepower and much torque without changing such original elements as pistons, rods and crankshaft on the boost pressure equal to 0.5-0.7 bar.