Here forth it comes
Alright professors in case you don\'t remember what this device does it modifies the signal of the MAF sensor in order to either lean out or richen the A/F mixture.
That\'s all it does.... However the neat part is... it\'s adjustable on the fly, you can do different corrections at different points in the rev range. so on and so on.
Anyway start by buying one:
It\'s around 300. I got this one almost a year ago for about 276 on ebay. Brand new.
Now the way the SAFC does it\'s job is by being connected to the computer. Here is a picture labeling where each wire needs to be connected to in order for the SAFC-2 to work. 
Gray is tapped into the TPS.... stock S12\'s do not have TPS\'s (they have ONE switch) so this can be left untapped.
The yellow is the SAFC\'s MAF output. This wire will eventually be connected (inline not spliced) to the ECU\'s MAF input. It will give the computer the \"corrected\" MAF signal
Ground 1 is connected to the ECU\'s (yes the ECU\'s) ground wire and should be spliced into the wire farther away from the ECU after.......
Ground 2 is connected to the same wire a little bit closer to the ECU compared to the splice for ground 1
The green wire is the RPM signal. Obviously you will splice into this wire from the ECU\'s RPM signal input.
The white wire is the SAFC\'s MAF sensor input. This wire will connected to the MAF sensor output.
when you cut the ECU\'s MAF input you will connect the MAF portion to this wire and the ECU part to the yellow wire get it?
The Blue and purple wires are the MAP (manifold aboslute pressure sensor) sensor input and outputs for the SAFC. I would use on my car but not on the S12. It doesn\'t use a MAP sensor for metering fuel. So obviously don\'t do anything with them.
I don\'t have the instructions anymore and I forget what the orange one is for but I made this picture when I had them so I\'d say the orange isn\'t used either.
The purple wire will be spliced into the Knock sensor input wire.
and finally the red wire is the 12v power source which you will also get from the ECU\'s power wire.
\"but johnny What the **** am I supposed to do with all these wire if don\'t know where on the back of the computer to splice and hook them up to?\"
Well you lazy pieces of poo.... get the Big ****ing book out and find out yourself...
Nah j/k I have the answer to that too. 
The ECU pin-out courtesy of one_equals_two and mr.bob.
Now I do have a picture of it wired in but it doesn\'t show you the colors of the wires you need to splice and tap anyway so just follow the pinout I showed you and you\'ll be fine.
One it\'s all wired in you\'re good to....
Setup the SAFC.
First you will have to tell the SAFC how many cylinders the car has, what type of metering system the car what metering sensor the car has and what type of TPS the car has.
So here\'s how you do it.
Turn the key to the on position DO NOT START THE CAR IT I WON\'T RUN ANYWAY.
Then the SAFC should start dancing around 
use the stick to scroll to the etc. menu and press the button
Then go to car select 
This screen is what you will see
It most likely won\'t be set like the picture. So using the pad set the # of cylinders to 4 then go over and set the \"thr\" (which is throttle in case you couldn\'t figure it out) to ****..... no seriously set it to ** this is the setting you use for the stock TPS which you didn\'t tap into because you don\'t have one.
Go back to the etc. menu by pressing left on the stick. Then go to sensor type
You will see this screen
continue by pressing into the Hot-wire selection
You will see this screen 
Except for the fact that 01\'s will be the default and you will see them in place of the 04\'s. This is the sensor setting you need. 04 is for the the CA18DET sensor which we have. Now if you put different numbers in the SAFC will convert the sensor\'s voltage range you currently have (say a 300zx TT sensor) into what the computer is progammed for allowing you to use a different MAF sensor (so long as it\'s measuring capacity is more than the stock one othewise the car won\'t run right anyway) without having to hack into the computer\'s ROM and rewrite it.
Once you\'ve done this the car is ready to drive. However you should set the knock sensor correction while you\'re here.
Go ahead and start the vehicle now go back to main menu and go to the setting\'s menu. In there scroll to knock set
now while the car is running of course raise the engine to around 1500 RPM then press right on the stick. This tells the SAFC that this raw knock sensor output is \"normal\"
Then raise the engine RPM to 3000 RPM and do the same thing.
The result should be around this but the numeric values might be different
Setup is complete, install larger injectors, tune with a wide band, and proceed to lay waste to your froerr..... I mean rear tires..
Beautiful.... *sigh* If only I could still keep it....
Sep 13, 2005, 1:25 am · #1