TQ per liter = 66.6. Current 4.0 liter single VVT-i. 236 HP/266 TQ. HP per liter = 59. TQ per liter = 66.5. So you can see in the above comparison, the engines are pretty comparable from a HP and TQ per liter standpoint, as they share similar technologies (single variable valve timing). I would attribute the ever so slight difference in TQ per This eliminates pumping loss (where the cylinders are sucking against a closed intake manifold) and gives finer control over the mixture. Vtec is a variable valve lift (how far the valve opens). VVT is variable valve timing (how soon/late the valve starts opening in relation to the crank position). i-Vtec has both. Mengenal Teknologi Mesin Toyota VVT-i dan Dual VVT-i. Liputan6.com, Jakarta - Sejak 2004, mobil Toyota yang dipasarkan di Indonesia sudah menggunakan teknologi VVT-i. Sejatinya, teknologi merupakan pengembangan mesin variable valve timing (VVT), yang sudah digunakan oleh raksasa asal Jepang tersebut sejak 1991. Most modern engines have either a single overhead camshaft (SOHC) or dual overhead camshaft (DOHC) design. A vehicle's camshaft operates the intake and exhaust valve(s) in the engine to control airflow in the engine's cylinders. (VVT) and other fuel-saving technologies into a DOHC engine. You can learn more about the differences between The "grey top" pictured in the OP is a FWD with single vvti engine found in the JDM Caldina and Rav4. The "red top" can found in a JDM Celica and MR2 and also FWD (MR2 not FWD, but you know what I mean). The "grey" and "red" are basicly the same with one difference. The "grey" has cats built into the header. Furthermore, VVT also broadens the torque curve before the peak, and prevents horsepower from dropping off rapidly after the horsepower peak. "With variable valve timing, we typically see a 5-10 .

single vvti vs dual vvti