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what does a SAFC do?

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Super Air Flow Converter

Modifies the airflow signal from your MAS, so that the ECU thinks either more or less air is entering the motor. This is useful if you want to use slightly larger than stock injectors, so that you can indirectly adjust fuel supply by way of the airflow signal.
 
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what everyone has said is right. It also can tell you things like your exact rpm or throttle use percentage, Karman etc. on mine i could see the highest rpm and throttle percentage full at that current time. you should have someone who knows what they are doing tune the safc unless you have a logger or wideband then you can figure it out on your own. i have some basic settings for a 14b with stock injectors and 18psi if you want them pm me and ill give them to you should work for you.
 
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afsdsm said:
It allows you to adjust fuel by tricking your ecu into thinking more or less air is entering the engine.
Click to expand...
Ok, so im assuming since you said tricking your ECU into "Thinking" that means the SAFC doesnt actually adjust the air flow at all.. right?
 
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There is a ton of information available on the SAFC and the SAFC II. They have been around for a long time. Just search around on the site and you will find a lot of the information.

installation guides:
Super AFC II Install
http://www.vfaq.com/mods/wayback/afc.jpg
APEXi AFC Installation on 2G

Acronyms:
1000 Already Answered Questions - Questions page

Quick overview:
APEXi Electronics Descriptions (SAFC II , VAFC II, AVCR, Auto Timer)

More detailed:
Apexi Super AFC For The Eclipse/EVO

Basically think of it this way. You are putting an air/fuel mixture controller before the ECU that is able to adjust the ratios that the ECU sees to trick it into doing what you want it to.

The SAFC is a piggyback system that only allows the ECU to see what you want the ECU to see. You do not actually change any values in the ECU directly.
 
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It does do all that and it works to an exstent. Other wise personally I would tell you it would only waste your money for a small amount of tuning because you can only trick the stock ecu so much. But if your on a budget you can definitly lean out your setup and make a little power.
 
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96gststeele said:
Ok, so im assuming since you said tricking your ECU into "Thinking" that means the SAFC doesnt actually adjust the air flow at all.. right?
Click to expand...

Heck of a thread revival. :p

Taken from an aged article of mine. Hope it answers a question or two.


1 : SAFC - A SAFC is a piggy back that is fairly popular among the mildly modified crowd. It is effective for moderately mild tuning and getting things dialed within a specific range. It is not, however, very capable when it comes to other things besides intercepting signals from your MAF, changing the variables, and sending that to your ECU. This, in turn, makes your ECU think that there is more or less air being drawn in and attempts to compensate by adding or removing fuel. Essentially, if you want to run a little leaner, you set the SAFC to tell the ECU that there is more air coming in than what's really there. The ECU dials back fuel and keeps taking in the exact same amount of air as usual.

SAFC's are also able to display RPMS and various other things by intercepting signals for your Tach and CAS. While you may not be able to edit timing, you can monitor it. They do have the potential to cause issues with your ignition timing, though.

Please, also note that most people do not recommend using injectors larger than 650's (675 to be exact), though it has been known to end with good results. It's a rule of thumb that AFC's can only control 50% larger than stock as to what the ECU accommodates. Also note that Automatics use smaller injectors than 5spd ECU's.
Click to expand...
 
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When the SAFC lies to the ECU about the air flow, the ECU calculation of the final cylinder pressure will be wrong. The air/fuel ratio may be correct with large injectors but the timing to compensate for higher cylinder pressure and temperature will be wrong.

As long as the air flow correction is not too large the timing error will also not be too large.
 
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TunaTalon said:
When the SAFC lies to the ECU about the air flow, the ECU calculation of the final cylinder pressure will be wrong. The air/fuel ratio may be correct with large injectors but the timing to compensate for higher cylinder pressure and temperature will be wrong.

As long as the air flow correction is not too large the timing error will also not be too large.
Click to expand...

Nail on the head. :thumb:
 
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Dang on all of these threads I feel so far behind compared to everyone else in the DSM community. But thanks everyone for all of the posts. And could this be slightly harmful to your engine or ECU? Also does anyone know if it would work okay with stock injectors?
 
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