VAFC II Full Installation Info
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thougth i would post this up so everyone knows what a vafc is in general
VAFC in general explained:
Piggyback Fuel Computer with Integrated VTEC Controller
Modifies manifold pressure signal and alters VTEC engagement point on Honda VTEC engines; Vacuum Fluorescent Display (VFD).
A'PEX introduces the first digital fuel computer that combines fuel computer functions with a VTEC engagement controller. The V-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments (or 100 RPM increments on the VAFC2). The range of fuel adjustment is +/- 50% at each of the user-defined setting points. The Fuel Adjustment function considers wide/narrow throttle and low/high camshaft settings, from which four different fuel maps are created (wide-low, wide-high, narrow-low, narrow-high). The integrated VTEC Controller adjusts the point at which the engine switches from the Lo to Hi cam during acceleration, as well as when the engine switches from the Hi to Lo cam during deceleration.
VAFC in general explained:
Piggyback Fuel Computer with Integrated VTEC Controller
Modifies manifold pressure signal and alters VTEC engagement point on Honda VTEC engines; Vacuum Fluorescent Display (VFD).
A'PEX introduces the first digital fuel computer that combines fuel computer functions with a VTEC engagement controller. The V-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments (or 100 RPM increments on the VAFC2). The range of fuel adjustment is +/- 50% at each of the user-defined setting points. The Fuel Adjustment function considers wide/narrow throttle and low/high camshaft settings, from which four different fuel maps are created (wide-low, wide-high, narrow-low, narrow-high). The integrated VTEC Controller adjusts the point at which the engine switches from the Lo to Hi cam during acceleration, as well as when the engine switches from the Hi to Lo cam during deceleration.
hey guys i just got a vafc2 and a turbo kit and im about to put them on tomorrow and was wondering if anyone has a similiar setup that could send me a list of settings to start with to maybe make my life easier, i have a 02 ex mt, im of course needing to take care of the map sensor to keep it from throwing a check engine light and then of course add more fuel, any info asap would be great thanks guys
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From: Las Vegas, NV
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so if the ECU resets after a while....will the settings in the VAFC reset? or does the ECU reset and the VAFC keeps the same settings but they have no effect on the ECU? just wondering in case this happens in the future.....
Joined: Sep 2002
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From: NV
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The vafcii will stay the same. They're just talking about the ecu adjusting itself to slowly go back to stock a/f ratio. I'm not so sure this will even happen due to the vafcii being wired AFTER the ecu signal. So the ecu is gonna have a hard time adjusting something if the vafcII makes the final choice.
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Rep Power: 0 i got some noob questions...
1. is getting vafc/2 useful on a non turbo car? like just a car with bolt-on and stuff?
2. can you still use the vafc/2 after you do a swap for let's say k20 or k24? and would it be useful?
TIA
1. is getting vafc/2 useful on a non turbo car? like just a car with bolt-on and stuff?
2. can you still use the vafc/2 after you do a swap for let's say k20 or k24? and would it be useful?
TIA
Joined: Sep 2002
Posts: 51,241
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From: NV
Rep Power: 812 I gained 2whp after dyno tune with vafcII, ported head, plugs, HVS, and header. I have an auto tho, others with manual have gotten up to 10whp tuning the wide hi throttle settings.
Ok i was able to reset my safc.
Here is the next problem i am running into. When i am on HI throttle the car cuts out in the 3g and 5g rpm range. At first i thought it was because my safc was misconfigured. So today when i reset it and put the settings back. Then i made several pulls and the a/f gauge indicated that it was running rich and the car was performing normaly.
Then i drove round to a couple of places ie target, and went to get something to eat. On the way back home I stepped on it just to see that every thing was still ok. Well it wasnt, after resetting the safc, the problem still presist.
Has anyone else came across this problem? Really its kinda weird. For example, even tho the setting shows HI35% for 4600 rpm or 3200, its spiradic but it will cut out, or die out for a second, or the engine wont get any fuel or it will run lean. Let just say it cuts out for a second, then it starts working normaly through the rest of the rpm range while on high throttle. This ONLY happens on HI, i really cant detect this happening on low throttle.
This is really getting frustrating. Help needed.
Here is the next problem i am running into. When i am on HI throttle the car cuts out in the 3g and 5g rpm range. At first i thought it was because my safc was misconfigured. So today when i reset it and put the settings back. Then i made several pulls and the a/f gauge indicated that it was running rich and the car was performing normaly.
Then i drove round to a couple of places ie target, and went to get something to eat. On the way back home I stepped on it just to see that every thing was still ok. Well it wasnt, after resetting the safc, the problem still presist.
Has anyone else came across this problem? Really its kinda weird. For example, even tho the setting shows HI35% for 4600 rpm or 3200, its spiradic but it will cut out, or die out for a second, or the engine wont get any fuel or it will run lean. Let just say it cuts out for a second, then it starts working normaly through the rest of the rpm range while on high throttle. This ONLY happens on HI, i really cant detect this happening on low throttle.
This is really getting frustrating. Help needed.
Last edited by SODJAZERO; Feb 21, 2005 at 11:10 AM.
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 812 I've heard the best throttle position for our cars is 25% narrow 80% wide.
I have a question. What happens when you reset the ecu? Is it a good idea to reset the vafc as well and wait for the ecu to adjust before putting the vafc settings back in? Or does it even matter?
I have a question. What happens when you reset the ecu? Is it a good idea to reset the vafc as well and wait for the ecu to adjust before putting the vafc settings back in? Or does it even matter?
Thanxs For All The Help ;)
I just wanted to say to the 6 people I Instant Messaged over the week, THANK YOU!. I just installed my VAFC-II this morning. It's running good right now, I love to see the RED light come-on.. sikes me out..
The only thing is when I first got it installed I did the initial setup. But never setup when vtec should kick in just so I could drive it around to play with the monitor functions. And sure enough that ORANGE CHECK ENGINE LIGHT CAME ON! I think im gonna take off my negative battery cable tommorow and see if that fixes the check engine problem,.. We'll see though any suggestions?
thanxs again!
steve (AIM: snoughboarder)
The only thing is when I first got it installed I did the initial setup. But never setup when vtec should kick in just so I could drive it around to play with the monitor functions. And sure enough that ORANGE CHECK ENGINE LIGHT CAME ON! I think im gonna take off my negative battery cable tommorow and see if that fixes the check engine problem,.. We'll see though any suggestions?
thanxs again!
steve (AIM: snoughboarder)
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 812 Well if you have all the wires hooked up, the cel shouldn't come on at all. I have the vtec set to stock which is all stars ****. If you follow everything in the first post you shouldn't have a problem.
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 812 Well the ELD senses electrical load on the alternator and turns it off when not needed. There must be something drawing constant current and preventing the ELD from shutting off the alternator like it should. Either you wired something from a fuse that you shouldn't have, or a fuse is blown. Or something else.
I got another Q guys.... For some reason It only does this every once in a while, while im driving, It wont let me go over 4000 rpm's and when i do it putters like it's not getting the fuel or somthing.. any help would greatly be appreciated it
GEARBOX & XPRODUCTIONZ..
I was looking at my installation and there are two wires left over there is a light blue wire and a blue wire. I was reading in step 4 of your install that the blue wire is supposed to go to the blue wire with a black strip on it? I don't see that wire anywhere on my ecu harness... any help?
AIM: snoughboarder
AIM: snoughboarder
