Jun 18, 2011 · Many speculated it might have been a differet "tune" of the 4.0 liter with single VVT-i at the time, but the consensus as I understand it was that slightly different HP & TQ rating was a result of 91 octane gas, which led to the consensus among many that obviously this engine being a higher compression engine would show benefit from using ...

Aug 7, 2019 · On the exhaust side, Variable Valve Timing-intelligent (VVT-i), which optimally controls the exhaust camshaft (No. 2 camshaft) to the valve timings according to driving conditions, is used." I ask - how is it controlled and activated?

Aug 2, 2014 · Both VTEC and VVT-i are examples of variable valve timing, they're just the different trademark names of their associated brands. Variable valve timing allows for better fuel efficiency by controlling amount of time the intake valve is open (retarded timing=less fuel used) depending on what the demand is on the throttle.

Jun 21, 2009 · There isn't a lesser grade offered than the VVT-i. This is just an oil pressure actuated cam phaser. This perticular application only controls cam angle of the intake camshaft, not lift or duration as mentioned earlier. Toyota does have the technology known as VVTL-i.

Jul 11, 2012 · Dual VVT-i 1GR-FE For the 150-Series LandCruiser Prado and FJ Cruiser, the dual VVT-i system could vary inlet valve timing over a range of 40 degrees and exhaust camshaft timing over a range of 35 degrees (relative to crankshaft angle). Maximum valve overlap (the period when both exhaust and inlet valves were open) was 68 degrees for maximum ...

Oct 10, 2009 · VVT-i is sort of like the best of both cam worlds, you can have a high hp, high rpm cam and a high torque, at low rpm cam on the same camshaft. It basically is the same as Honda's VTEC. Interesting fact it was actually Ferrari who originally used variable valve technology, way back in the mid 1980's!

Jul 12, 2010 · According to my searching on here, it's a problem with the Variable Valve Timing (VVT). I brought it by Toyota to see if they could take a look at the OCV (Oil Control Valve) for the VVT. They said they checked it and it was fine, and they said that it is most likely a problem with the timing chain itself.

Sep 27, 2009 · Dual VVT-i is more about emissions and economy than performance. The current tacoma has more torque than that FJ cruiser with premium gas specs. Besides, its the same engine with dual vvt-i, and dual vvt-i isn't anything new or special, it's been around since the 90s.

Nov 12, 2021 · An updated version of this engine features Dual VVT-i, increasing output to 254 hp (189 kW) and 270 lb·ft (366 N·m) on 87 octane and 285 hp (213 kW) and 289 lb·ft (392 N·m) on 91 octane. Inside, the 1GR uses a " taper-squish " combustion chamber design with matching pistons to improve anti- knocking and engine performance, while also ...

Oct 5, 2011 · Could SOMEone tell me WHY Toyota insists on still making the SINGLE VVT-i (236hp) for the Tacoma, instead of just using the DUAL VVT-i (270hp) from the...