For the engine to gain HP AT the point of vtec actuation the dyno graph would have to have a vertical line at that rpm. No dyno is going to show this. Take a look at this dyno chart provided by ComptechUSA. At vtec actuation, the line HP "acceleration" becomes steeper but does not go vertical thus there is no instantaneous HP gain of anywhere
reset the ecu and changed the oil. still no vtec. i let the car warm up. drove it for about 10 minutes before trying to go to vtec, but it still does not engage. could it be my ecu. I have only had the car for 6 months. The vtec worked when i got the car. Any ideas. I am not very good at working on import engine's so please explain in detail.
A single overhead camshaft (SOHC) engine has just one camshaft located in the cylinder head. A dual (or double) overhead (DOHC) engine has two camshafts per cylinder head. SOHC engines are usually less complicated, easier to work on, and have lower manufacturing costs. DOHC engines, on the other hand, provide better airflow through the engine

In some cases, it can even make it harder to start the engine. Now, what the i-VTEC technology does is that Honda engines work effectively by having multiple camshafts. This is the reason why Honda i-VTEC models have high-performance and lower fuel consumption. Honda Malaysia offers the Honda City, and the Honda Civic with this type of technology.

Honda vehicles use a variable valve timing system known as VTEC, which stands for Variable Valve Timing with Electronic Control. Briefly, since this system uses pressurized engine oil to activate the valve timing system, the PCM (Powertrain Control Module) uses a control solenoid to control the flow of oil to the VTEC system.
Manufacturers usually guess how the engine will be used, and will then tune the valve timing to that speed. For instance, a sedan would probably run the most efficiently at medium engine speeds, while a sports car might run more efficiently at a higher RPM. VVT allows the best of both worlds by adjusting the cam to match the engine revolutions.
Unlike traditional valve timing systems that rely on a single camshaft, the i-VTECĀ® system uses two camshafts and an electronic control unit (ECU) to control valve timing and lift precisely. This allows the engine to switch between different operating modes, depending on the driving conditions, to optimize performance and efficiency.
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. For the i-VTEC system, I know you are pretty familiar with this, so letā€™s take a brief explanation of it. L-series VTEC engines are used in the 1.5t Honda Fit and 1.5 VTEC Honda Jazz. VTEC focuses mainly on fuel economy and low emission, just like the i-DSi but giving a higher level of power, which equates to higher performance. If you want to feel/hear the R18 VTEC kick it's pretty easy. While moving, lightly press on the gas until the engine revs up to 3500 rpm*, right after it revs past 3500, floor it. You will notice a slight pause and then the engine will sound much louder/aggressive and it will pull much harder, a.k.a. "VTEC kick". At the top of most modern car engines is the "head" that contains, in simple terms, all the valves, camshaft(s), and sparkplugs that make the engine function. VTEC works by using a set of three There has been many different implementations of vtec over the years. When people talk about how great it is, they are referring to different engine series then yours. The D, B and K series engines mostly featured vtec on the higher performing engines. The L and R series feature vtec as more of a fuel economy thing. Your car uses an L15 family
HONDA V-Tec OperationDescribes the operation of the HONDA V-Tec variable valve timing system. Like never seen before, this animation goes into details on the
When Does VANOS Kick In? Unlike VTEC, VANOS doesnā€™t really ā€œkick inā€. Cam phasing VVT systems generally donā€™t have a single point where they step in and make a massive difference. Instead, the system works throughout the entire rev range. How far the system will advance the timing depends on several critical pieces of data. Engine RPM
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    • how does a vtec engine work