VAFC...
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Joined: Sep 2002
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From: crazy town, tx
VAFC...
ok, i have had this vafc in my car for almost 2 years now, and i STILL dont know sht about it, i have read the manual on it, nothing, searched on here, nothing, what does everything mean?, only thing i have touched is the vtec x-over
Joined: Apr 2004
Posts: 107
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From: Im your huckleberry.
Re: VAFC... (slowazzhatch)
hokay, I would have answered sooner, but rules is rules I guess.
The V-AFC is a piggyback fuel management system. It basically plugs into your ECU and manipulates your A/F ratio, VTEC, etc. It's most useful when you put the car on a dyno, get a readout of your A/F ratio, and use the AFC to correct lean spots and what not. Dyno tuning the AFC is the only way to correctly calibrate the A/F ratio. It's not something that you can do in your garage unless you have an 02 sensor like the dynos have. You'll just end up screwing up your car.
As you mentioned, it can be used to change your vtec engage. However, the nature of the longer vtec cam lobes doesn't really produce any kind of performance gains at RPMs other than the stock engage point. You might be able to manipulate some HP out of your engine by moving it back or forward a few RPMs.
Hence, the V-AFC is least useful on cars running the typical bolt-on mods (I/H/E). However, if you're running heavy nitrous applications, performance cam shafts, or any number of hard-tuned internals that can change your engine's environment (pistons, vavles, injectors, etc), you may find that any of the piggy back systems (V-AFC, V-AFC II, S-AFC, etc) could prove very helpful in improving engine performance.
The V-AFC is a piggyback fuel management system. It basically plugs into your ECU and manipulates your A/F ratio, VTEC, etc. It's most useful when you put the car on a dyno, get a readout of your A/F ratio, and use the AFC to correct lean spots and what not. Dyno tuning the AFC is the only way to correctly calibrate the A/F ratio. It's not something that you can do in your garage unless you have an 02 sensor like the dynos have. You'll just end up screwing up your car.
As you mentioned, it can be used to change your vtec engage. However, the nature of the longer vtec cam lobes doesn't really produce any kind of performance gains at RPMs other than the stock engage point. You might be able to manipulate some HP out of your engine by moving it back or forward a few RPMs.
Hence, the V-AFC is least useful on cars running the typical bolt-on mods (I/H/E). However, if you're running heavy nitrous applications, performance cam shafts, or any number of hard-tuned internals that can change your engine's environment (pistons, vavles, injectors, etc), you may find that any of the piggy back systems (V-AFC, V-AFC II, S-AFC, etc) could prove very helpful in improving engine performance.
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