S-AFC With Chipped or Tuned ECU

[Paradox]

would a tuned ECU or say chipped ecu work with an S-afc installed. Would there be any drawbacks in doing this, or would i lose any potential in what has been tuned throught the ECU , or chipped ECU?

This is a seriouse question,i need seriouse answer please. Thanks

If its a stupid question to you, then answer wisely thanks..

[al]

it will work ... for the people who don't have access to reflash the ECU, a piggyback is nice to have to fine tuning.

[Paradox]

so tuning and installing S-AFC will not harm the tuned ecu at all, at least not dramatically. because i know the s-afc adjust air flow and fuel. im hoping that dramatic changes are not made... just curious?>

[-=E36=-]

it will work ... for the people who don't have access to reflash the ECU, a piggyback is nice to have to fine tuning.

Doode is it true that the SAFCII also plays a bit with timing???? i heard that today and it freaked me out. I hate it when I dont know something.

Ryan

[al]

Doode is it true that the SAFCII also plays a bit with timing???? i heard that today and it freaked me out. I hate it when I dont know something.

Ryan

The only way I can see it affecting timing is if the settings made the engine knock, causing the ECU to go into Safe Mode and retarding timing like a mother bitch.

[Paradox]

RMP signal for air flow & pressure sensors can be adjusted in 12 points in 1% increments depending on fuel settings in +50% to -50%. Or the RSP can be set in increments of 200 RPM. Throttle opening duration: Adjustable by size.

Modifies air-flow meter signal (pressure signal in some vehicles) to optimize fuel-air ratio; Vacuum Fluorescent Display (VFD).


The second-generation S-AFC is a fuel computer that adjusts fuel/air ratio by modifying the air-flow meter/MAP sensor signal. The S-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments. The range of fuel adjustment is +/- 50% at each of the user-defined setting points. On hot-wire vehicles, the Deceleration Air Flow Correction function is capable of curing the erratic idle and stall problems associated with open-atmosphere blow-off valves on hot-wire air-flow meter systems. The S-AFC is capable of monitoring and replaying the following data channels in Numerical, Analog Meter and Graph displays: Intake Manifold Vacuum/Boost Pressure, Air Flow Capacity, Intake Manifold Pressure, Karmann Frequency, Engine RPM, Throttle Position, and Air Flow Correction %.

Due to the complexity of this product, A'PEX recommends having the S-AFC and other A'PEX electronics installed and tuned by authorized A'PEX Power Excel Shops.

[Paradox]

Monitor Mode: Allows monitoring of up to four channels at one time. Also allows tracing of AVC-R monitor functions.

Setting Mode: Allows user to adjust air/fuel ratio through Hi and Lo Throttle maps. Other features such as throttle percentage settings, RPM point settings, and deceleration air-flow correction are adjustable through the setting menu.

Etc. Mode: The etcetera menu is used to adjust the variables that are required for the S-AFC to properly adjust fuel (i.e. # of cylinders, throttle position sensor type, sensor type, etc.)

Up to four data channels can be selected for monitoring:

Intake Manifold Vacuum/Boost Pressure
Air Flow
Intake Manifold Pressur
Karmann Frequency
Engine RPM
Throttle Position
Air Flow Correction %

Up to four parameters can be monitored in three different ways:

Numerical
Analog Meter
Graph Display


If monitored numerically, pressing the up key allows the user to see a peak hold value for the chosen parameter.
If monitored in analog meter mode, up to two meters can be displayed at
one time. Pressing the up key allows the analog meter to hold the peak value. If under 3 or 4 channel mode, only the first two channels will be displayed.
If monitored in graphic display mode, pressing the up key allows the AVC-R to start "sampling" or memorizing data channels.

The memorized graph can then be replayed by pressing the right key. Anytime during replay the right key can be pressed again, and the display will pause.

During replay, the user can press the left key to review any part of the memorized graph. If monitoring one channel, then the last 60 seconds can be replayed.
If two channels are being monitored, then the last 30 seconds can be replayed.
If two channels are being monitored, then the last 20 seconds can be replayed.
If two channels are being monitored, then the last 15 seconds can be replayed.
Both the Hi and Lo Throttle setting maps are used for adding or subtracting fuel throughout the fuel curve. This unit takes the input airflow signal and converts the signal into an air volume value. This value is modified through the Air Flow % Correction Setting. The modified output air volume value is then converted back into an airflow signal and sent to the ECU.

The Hi and Lo Throttle setting maps can be adjusted at eight different RPM points that are user adjustable. The range of fuel adjustment is +/- 50%, which can be done in 1% increments. During tuning, the Hi Throttle map should be set first, and Lo Throttle map second. All values between the predetermined RPM points will be interpolated. Only a professional, using engine monitoring equipment should be tuning the S-AFC.

[ofay]

dude we know what it is and what it does.

[Paradox]

dude we know what it is and what it does.
welll who is we by the way? i posted this up soo everyone could learn for the ones that dont know, maybe they can get involved in helping out on my question, thanks

[20lbbooster]

it will work like a champ. just make sure you hook it up right. we have done it 1,000,000 times!

Louie

[SecretAgent]

Doode is it true that the SAFCII also plays a bit with timing???? i heard that today and it freaked me out. I hate it when I dont know something.

Ryan

that is correct. it tricks the ecu into thinking a different maf or map signal is ocurring, changing the fuel and timing cell it uses. lessing fuel retards timing, upping fuel advances timing...most of the time at least, it depends on how the ecu is mapped.

[-=E36=-]

that is correct. it tricks the ecu into thinking a different maf or map signal is ocurring, changing the fuel and timing cell it uses. lessing fuel retards timing, upping fuel advances timing...most of the time at least, it depends on how the ecu is mapped.

ah thats what I figured, but how can you find out how much the timing is changing with the different inputs you make?

This also explains another reason why make huge ajdustments (like trying to compensate for huge injectors) with a SAFC doesnt work well.

Ryan

[SecretAgent]

you have to look at the factory map. or get the car on a dyno, with a timing light, and measure the timing at specific rpms and loads (but highly unreliable). it's this reason why i don't suggest running an SAFC, unless you have very small mods from stock.

[-=E36=-]

you have to look at the factory map. or get the car on a dyno, with a timing light, and measure the timing at specific rpms and loads (but highly unreliable). it's this reason why i don't suggest running an SAFC, unless you have very small mods from stock.

The SAFC2 is really handy for me for small adjustments. I consider it my season adjuster, use it to compensate for temp outside. PFC does the rest.

Ryan

[slideways2004]

yes you can use the safc w/ a chipped/tuned ecu. that is my plan. i plan on going w/ and enthalpy tune(240 owners know what i'm talking about) w/ safc for fine adjustments