How does a Vtec Controller work and what is it used for?

ive heard of apexi or something but what are they for and how do they work? what about the price range on them?How does a Vtec Controller work and what is it used for?
Vtec is a valve timing control module that helps with power and fuel economy for Hondas, and Acuras, and some other cars now. Not sure on the price range of them though.How does a Vtec Controller work and what is it used for?
Yes, the Vtec controller is made by Apexi.





Basically the V-AFC controller is used for changing the Vtec engagement point. For example the stock Vtec change over point on a 00 Civic Si is 5300, but with the Vtec controller you can adjust the change over anywhere from 3000-6000 rpms.





Vtec controllers are also used for adjusting the air/fuel ratio across the entire rpm range of the engine.





The price range of these usually run about $300-350.





I would recommend only using one if your car has some more serious mods done to the engine...if you dont it is kind of worthless to buy because your paying more than $300 just to adjust the vtec change over point.
it pretty much does nothing...it's just a fancy label they put on their cars to make them seem better. the only thing it does is drain your gas mileage like crazy when it's engaged. doesn't provide for much more power though.
the apexi (s) go for around $300ish........





they are good. just dont get a knock off..





heres the Apexi info on the V-AFC 2





The highly anticipated release of the new A'PEX VAFC II started a new revolution in piggy-back style fuel controllers. Building upon the world wide success of the previous VAFC, the new VAFC II has taken the proven technology of the last VAFC to the next level. For optimal fuel control, the VAFC now allows for 12 point fuel manipulation in 100 RPM increments. The VAFC II also allows for the VTEC engagement point to be manipulated from 3000-7000 RPM, including the new i-VTEC systems. The redesigned case features a center push button with a rotating outer switch for easy and precise data input. To protect data maps from being tampered with, the new VAFC II features a password protection system.





Like the Super AFC II, the VAFC II displays data in three different modes: Numerical, analog, and graph. Numerical mode allows the user to monitor up to four different values in numerical format and also shows peak hold values on demand. The analog mode displays up to two values in an easy to read meter style display. Peak hold is included in analog mode as well. The graph mode offers real time graph plotting with a built in ghost map trace feature. The graph can relay movement up to 60 seconds.


New Features Include:





- New case design with center push button and rotating outer switch


- VTEC engagement control from 3000-7000 RPM in 100 RPM increments


- 12 point fuel control for LOW and HIGH VTEC maps (total of 24 points)


- i-VTEC compliant


- Monitor i-VTEC VVT movement in real time


- Password protection


- Red LED light indicated cam switchover point


- EEPROM chip for maximum data storage


- VTEC Match/Unmatch correction for smooth VTEC engagement modification


- Versatile mounting bracket














CONCEPT:


Piggyback Fuel Computer with Integrated VTEC Controller





CHARACTERISTICS:


Modifies manifold pressure signal and alters VTEC engagement point on Honda VTEC engines; Vacuum Fluorescent Display (VFD).








str8 from Apexi-usa.com





hope that helps...





~chino
I believe you must be talking about the Apexi VAFC right? It stands for VTEC / Air Flow Controller. It is a electronic device which taps into the ECU to adjust the VTEC activation rpm %26amp; adjustment of the intake air pressure or volume depending on the type of intake air sensor your car is using.(Vacuum sensor or air flow sensor)





I believe if you drive a Honda, you should know that the mechanism of VTEC is based on a secondary wild profile cam lobe which activates via a solenoid valve when the engine revs up to certain rpm. Most VTEC activation point in a stock DOHC VTEC Honda engine is around 5000 to 5500 rpm. Most tuners such as Spoon %26amp; Hondata believes that actually the optimum VTEC activation point is around 4500 rpm to improve acceleration.





To achieve greater power output, besides adjustment of the VTEC activation point, adjustment of the air/fuel ratio %26amp; ignition timing is also required because the setting of the stock ECU is meant to maximise engine lifespan but sadly,it also minimise engine power output.





To find out more about the product description %26amp; the price, you can refer to www.kingmotorsports.com