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Vafc problem

Old 08-12-2006, 11:31 PM
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Default Vafc problem

I just got a VAFC 1 I think is what it is called. Ok everything is hooked up I drove the car around the block the check engine light came on but the vtec is comeing on. I read a little more and it said cut the VTM wire and hook it up for a f22b1. Did that. Ok another drive. The Vtec is not working. Go in check settings it is set to go on at 5800 reset to 3000. Drive some more still no vtec. I can tell that is not working. You can fell the lack of power. I unhook the vtec wires from the vafc (pug to each other skipping vafc) vtec is working. I drive it around the block out on the highway and home. about 10 miles. Drives fine.

Do you know what would cause this? I got the vafc off ebay. Could it be bad?

I only bought it (vafc) for fuel correction (I have everthing to hook up a turbo). If I leave the vtec running thew the ecu stock will it work(with turbo)?
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Old 08-14-2006, 09:39 AM
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Default Re: Vafc problem

Yes, it'll still work with your turbo. Only reason they have that feature on the vafc's is to adjust your vtec engagement point, and let you balance out the difference in fuel with higher or lower engagment points. Honestly, vafc's are ok for only low boost apps, kinda like fmu's except that you'll want to run a larger injector with the vafc. If this is your first time trying to tune an afc, I'd highly suggest finding someone that has alot of experience tuning them, otherwise the chances of you toasting your motor are pretty high. The instruction manuals are pretty vague, and it mostly seems to be a trial and error setup to learn how they work. Even online resources really don't offer much help. TurboEF9's sticky at the top here has the formula for setting the base fuel settings for larger injectors, but keep in mind that the formula doesn't account for any boost pressure, so don't set it to those settings and run boost, they're just to scale the injector to run like the stock injector.
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Old 08-14-2006, 07:11 PM
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Default Re: Vafc problem

Something any f22b1 owner should know. THE VAFC WILL NOT WORK ON YOUR CAR. It can be used to control fuel but not VTEC!!!!!!!!! I called Apexi they said that the vtec is different on accords than other Hondas. The VAFC IS ONLY GOOD FOR FUEL MANAGMENT! Also Do not cut the VTM wire to install. It will keep the vtec from working all together!
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