Honda Car Forum

Why do they have V-Tech's when alot of people don't drive in a way that would engage the V-Tech? I understand with Sport compacts and such a V-Tech is a great thing to produce some numbers. It's my understanding if you don't have the engine at least to 5000+ RPMs the V-Tech doesn't even engage. Is this correct?

v-tech is basicly "red lining" and i believe that its 6000rpm

V-TEC or Variable Valve Timing and Electronic Lift Control, is more than just a power producing tool.It changes the lift, and cam timing to accomodate to different driving styles.If you are just doing regular daily driving the cam timing gets retarded and the valves dont lift as high, which gives you a much high MPG rate.Once you hit the V-TEC engagement point (Around 6000RPMs depending on engine model) the ECU senses this and begins to advance the timing and lift the valves more to allow the engine to run strong but less efficiently.So, technically, V-TEC is always engaged, it is just engaged for different purposes. Allowing you to get high MPG and still be able to achieve spirited driving from time to time.

VTEC is great. \HERE IS HOW IT REALLY WORKS:There are two can lobes for each valve, one for low RPM and one for high rpm. #1, high lift at idle and low engine speeds actually causes the car to be slower. Why? because instead of creating a suction and swirl to mix the gas and air it would blow through and out the exhaust. All engines are different, B series are 5000 RPM , yes, but my accord is 4500. Once it hits this point, the solenoid opens up and uses the vehicles oil pressure to lock the lifters into the rocker that rides on the higher lift and overlap cam lobe, greatly increasing engine power. This is the same technology Ferrari used on their engines in the 70, but they did it by retarding the exhaust valve to get a last extra push out of it. DOHC VTEC engines use the VTEC on the intake and exhaust valves, the SOHC VTEC usues it on the intake only. Jsut message me if you have more questions or if i left soemthing out, i was dreading typing all this Cr*p.

I'm not a huge fan of it, I'd rather have a non Vtec setup with a giant cam and engine mods to support it.

v tech is a kid's turbo.