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Could be. I'm not experienced with that stuff. I need to find a place that will dynotune it. That's the only way to really know if there's more power being made.
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Also you should know that the air/fuel ratio most likely cannot be adjusted because the ecu on 01-04 civics will adapt and counter any changes made with the vafcII. So I guess it's still useful to monitor engine functions like rpm, voltage, etc.
i think there is some truth to this but also false... see there was a discussion on this thing too.. but see they say the ecu learns from the vafc adjustments and doenst work... my belief is that it does that only on the newer ecu.. 03+... see.. they say after a few weeks or months the ecu resets... i have a friend that has a turbo that got his car tuned and its gonna be well into a year that his car has been tuned... then recently he got his car dynoed again and the settings where pretty mucht the same... just a 1 point adjustment and he was set again...but he drives an 02 which makes me think that the 01-02 dont learn but the newer ones does
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What I want to know is if the ecu is so smart, why doesn't it add more fuel by itself when it sees more air from mods? It has all these sensors everywhere to calculate the a/f ratio, but it's not able to do this?
lol... i think the ecu has a threshold.. if it starts to see to much air i think then it might just throw a CEL instead of hassling with adding more fuel.. its a honda ecu.. they want u to bring the car in everytime it detects something weird... kinda funny though how honda makes so much restrictions on there cars yet they advertise it as if there cars were measnt to be racers.. remember the "HONDA NATION" commercials with all souped up cars in it
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i have the VAFC-II but i didn't connect the TDC center wire because I called a guy at Apexi who said not to connect it because it wasn't the i-vtec. i know that was already stated i'm just tellin yah what I got. Anywho i have my vtec engagement point set to 4000rpm and a + correction from 3200 - 4800rpm. I'm not in front of my settings so I don't know for sure. ... i kind forget... as soon as my car hits the 4000 rpm mark, you can definately feel it. now i'm wondering if i were to hook up the TDC wire would it help my situation or not? Like someone said, the tuners said to connect it so the ECU knew when the engine was top dead center. ...now i'm curious... any input?
I would hook it up anyway. It's obvious apexi doesn't know how their own product works. If you follow their instructions (and don't connect the vtm wire), you will get a check engine light and cause more problems.
Also on your settings. Raising the vtec engagement will make it feel more noticable, but low end power will suffer as well. After tuning, most cars will benefit more from leaving it at the stock 3k engagement. Also, our cars run rich from the factory. So most people who actually end up tuning their car with basic boltons end up subtracting fuel.
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now if ur boosted like me then its makes a difference on when u set engagment time..as for fuel you'll end up adding more fuel when boosted but usually will lean out if not... but a friend of mines is leaned out till his vtec kicks in at 4500.. then i think it was like +2 or something like that.. dont know his exact numbers
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I guess I'll look into getting it tuned then. 
