What VVTi means?
Variable Valve Timing-intelligent
Tokyo―TOYOTA MOTOR CORPORATION announced today the development of its new “Variable Valve Timing-intelligent” (VVT-i) technology, which increases performance and fuel economy. By continuously changing the open/close timing of the intake valve, VVT-i provides optimum valve timing based on driving conditions.
Is the VVTi a good engine?
The VVTi mechanism is not unique to the land cruisers. It’s pervasive across the whole lineup of toyota’s and has proven it’s worth reliability in power and gas efficiency. Look at the pros – more power and efficiency across the board. That’s not something to be taken likely for a heavyweight car like the Land Cruiser.
How does Toyota VVTi engine work?
The system works by using a variable-speed head for the camshaft. This increases or decreases the speed of the camshaft in relation to the engine’s drive timing. That, in turn, changes the duration of the valve lifting to control intake and exhaust.
What cars use VVT-i?
All current Toyota models in the U.S. use VVT-i engines except the Mirai fuel-cell vehicle, the 86 coupe and Supra sports car. The 86 uses a Subaru engine and the Supra a BMW engine, and both have variable valve timing.
Does VVT make a car faster?
Higher RPM – The main advantage of having a variable valve timing technology is the increase it will provide in your engine’s revolutions per minute. When you step on the gas pedal to accelerate the vehicle faster, it will require more RPM to sustain this demand.
What is the difference between CVT and VVT?
In answer to your question – VVT can certainly offer efficiency improvements. CVT incurs greater drivetrain losses than manual transmissions and so wouldn’t really be considered efficient. Lift is employed solely as a performance measure and so is also not something that would be considered efficient.
At what RPM does MIVEC kick in?
More precisely, MIVEC switches to the higher cam profile at 3600 rpm as engine speed increases, and drops back to the lower cam profile at 3400 rpm as engine speed decreases; the output torque of the low- and high-speed modes overlap at those speeds.
What is a variable valve timing engine?
In internal combustion engines, variable valve timing ( VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
What is variable timing control?
Variable Timing Control ( VTC, sometimes called Variable Cam Timing (VCT), or NVCS (Nissan Variable [timing] Control System or Nissan Variable Cam System) was the name given to the variable cam phasing system featured on the VG30DE(TT) and other similar engines from the era.
What is Dual VVT engine?
The Dual VVT-i system adjusts timing on both intake and exhaust camshafts. It was first introduced in 1998 on the RS200 Altezza’s 3S-GE engine. Dual VVT-i is also found in Toyota’s new generation V6 engine, the 3.5-litre 2GR-FE first appearing on the 2005 Avalon.