taken from Articles (All About VTEC) In order for the ECU to initiate the VTEC system, 5 engine conditions must be met. Temperature: The engine must have reached normal operating temperature. Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC. Vehicle Speed: The car must be in motion (wheels spinning). Thanks to the way VTEC engines use one cam profile for low rpm use and another at high rpm, wild cams are less of an issue for driveability in a VTEC-equipped car as they can be in other engines. Unfortunately, Honda fit wild cams as standard in their performance VTEC engines, like in the Honda Civic Type R. For most situations, to take them Undoubtedly, VTEC and i-VTEC engines of the early 2000s hold a special place in our hearts. Those were some of the best Honda engines to build, specifically the B16, K20, D16Y8, K24, and D16Z6 engines. Not only do these motors showcase excellent reliability, but they also offer impressive performance at an affordable price. VTEC engines use two camshaft profiles while non-VTEC engines only use one. 2. VTEC engines can have excellent performance at high and low speeds while non-VTEC engines can only be optimized for either. 3. VTEC is only available on Hondas while non-VTEC are found on any car brand. 4. How it works. 3. Turbocharger with electronic wastegate. ‘Turbo lags’ are a typical outcome of conventional turbo engines. Accelerations tend to lag upon accelerating, as exhaust energy must rise to spin the turbines which then increase intake amount. This problem is rectified with the VTEC TURBO – using a turbocharger with electronic A ring terminal for ground (choose a 10mm bolt nearby and secure it) and 2 spade connectors that go into the distributor harness. You will disconnect your distributor from the engine harness and plug these spade connectors in to the distributor side. The plug will have a blue wire and a black/yellow wire. This type of design is worse in terms of fuel economy. But lower in complexity when it comes to implementing the VTEC system. As we noted previously this type of V-TEC is using two profiles and hydraulically selects the profiles based on the engine RPM. Similar to any variable valve timing system. VTEC-E uses the principle of swirling to promote more efficient air-and-fuel mixing in the engine chambers. VTEC-E works by deactivating one intake valve. Examine the diagram below. In the SOHC VTEC-E implementation, only one intake cam-lobe is implemented on the camshaft. Actually it is really a flat "ring". nZHK7Ju.