Super AFC Boost sensing:Just wanna make sure this works
09-07-05, 01:40 AM
#1
Boost sensing:Just wanna make sure this works
Ok i wanna make a few changes to my wireing of my S-AFC. It is the AFC with the 4 buttons on the right side of it (AFC I?) anyway, I want to get it to read the pressure signal and display it on the unit. My understanding is that I just attach the blue wire to the Red/ Brown wire coming off of my boost sensor (before the FCD) and then it should show an accurate boost. Is this correct??
2nd if i want to have the throttle reading read off of the boost i just attach it to the same wire. But will it matter if both the Blue(pressure) afc wire and the grey( tps) wire are connected to the Red/brown pressure wire at the same spot. The AFCs instructions make a big deal outa the ground being set up a certain way so i wanted to make sure that they don't mess each others signal up.
3rd Am I wasting my time? Can the SAFC 1 even read the Pressure and display it? did a search and it was a little confusing to tell the difference between the AFC 1 (4 buttons) and the AFC 2(****).
Sorry if this is a little confusing.
2nd if i want to have the throttle reading read off of the boost i just attach it to the same wire. But will it matter if both the Blue(pressure) afc wire and the grey( tps) wire are connected to the Red/brown pressure wire at the same spot. The AFCs instructions make a big deal outa the ground being set up a certain way so i wanted to make sure that they don't mess each others signal up.
3rd Am I wasting my time? Can the SAFC 1 even read the Pressure and display it? did a search and it was a little confusing to tell the difference between the AFC 1 (4 buttons) and the AFC 2(****).
Sorry if this is a little confusing.
09-29-05, 11:25 AM
#2
Seduced by the DARK SIDE
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You are on track.
With the THR input from the pressure sensor you should see about 43% at 0 PSI.
I currently have my low & high THR settings at 50% & 99%.
That keeps me in the low map till I pass 5PSI.
FWIW I tapped the blue PRS wire to the pressure signal after the FCD.
That way the S-AFC THR graph shows actual boost, and the PRS graph shows the FCD's clamp off.
With the THR input from the pressure sensor you should see about 43% at 0 PSI.
I currently have my low & high THR settings at 50% & 99%.
That keeps me in the low map till I pass 5PSI.
FWIW I tapped the blue PRS wire to the pressure signal after the FCD.
That way the S-AFC THR graph shows actual boost, and the PRS graph shows the FCD's clamp off.
Last edited by SureShot; 09-29-05 at 11:29 AM.
10-10-05, 10:22 PM
#3
Danger to Manifold
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Sureshot, does the SAFC display your pressure correctly using the blue input? Mine reads the right voltage but incorrectly displays pressure, I wasn't sure if that was 'normal' or if there was something i overlooked. Thanks I have a 88 turbo btw.
10-22-05, 01:22 AM
#5
Originally Posted by SureShot
You are on track.
With the THR input from the pressure sensor you should see about 43% at 0 PSI.
I currently have my low & high THR settings at 50% & 99%.
That keeps me in the low map till I pass 5PSI.
FWIW I tapped the blue PRS wire to the pressure signal after the FCD.
That way the S-AFC THR graph shows actual boost, and the PRS graph shows the FCD's clamp off.
With the THR input from the pressure sensor you should see about 43% at 0 PSI.
I currently have my low & high THR settings at 50% & 99%.
That keeps me in the low map till I pass 5PSI.
FWIW I tapped the blue PRS wire to the pressure signal after the FCD.
That way the S-AFC THR graph shows actual boost, and the PRS graph shows the FCD's clamp off.
Thanks for the help, i was guessing that this was the way to go, but wasnt sure
11-25-07, 02:08 AM
#6
i also need help with this. i have an safc-1 (4 button, no ***) and i wish to do the same. some one is saying do this with the gray wire from afc. you guys are saying blue.
if fcd is being used. hook it up prior to the fcd. if not being used. there is pin 2G (green/red on ecu.
k
so
0psi is 43%. but what is idle? (i sit vac10-vac15 closed throttle/idle)
lastly. my friend said it calibrates itself. so does it calibrate itself for idleing being.....
eesh. this is a bit confusing once you get down to the end of the installation and tuning.
can some one posibly contact me via aim?
fc3schick87
if fcd is being used. hook it up prior to the fcd. if not being used. there is pin 2G (green/red on ecu.
k
so
0psi is 43%. but what is idle? (i sit vac10-vac15 closed throttle/idle)
lastly. my friend said it calibrates itself. so does it calibrate itself for idleing being.....
eesh. this is a bit confusing once you get down to the end of the installation and tuning.
can some one posibly contact me via aim?
fc3schick87
11-27-07, 03:03 AM
#7
Wow zombie thread...
First go here: http://www.1300cc.com/howto/how2/safc.htm
very good instructions on how to hook it up.
Now it doesn't talk about the pressure wire, its blue, attach it to the sensor wire coming out of the Pressure (boost) sensor. It should be the brown/red wire for an s4 (i think it 2a in the ECU plug) i think it is green/yellow pm the S5 but don't quote me on that. The best way to tell is to use a voltmeter at the plug and a vac/pressure tester on the hose (my-t-vac is great). Test voltage with the ign on, car off. test the voltage on the wire should read like 2.4 but again don't quote me. Pull full vacuum on the hose going INTO the sensor, it should read much lower voltage. Now give it some pressure going into the hose (not too much!!!) it will read above 2.4 (should be 5 volts at 1 bar i believe) So now that you have found the right wire just splice it in. If you have a fuel cut defensor atach it before the blue wire befor the FCD. In other words between the pressure sensor and the FCD.
The afc should read the correct pressure without any calibrating. On the S5 you should be able to tune the sucker using the TPS like its supposed to. On the S4 its a bitch. Use like 96% for low 97% for high.
If you want to tune via booste that is when you connect the grey wire AND the blue wire to the pressure sensor. You can test the settings for high/low fuel and figure it out that way.
I never used the boost for this so I cant help too much.
i would figure that if 40% ish is 0 Psi idle would be like 20ish? You should be able to read it on the display. I would set low for what 0psi reads and say high at 8psi. that way it will ramp up in that range.
GL I'll check back
First go here: http://www.1300cc.com/howto/how2/safc.htm
very good instructions on how to hook it up.
Now it doesn't talk about the pressure wire, its blue, attach it to the sensor wire coming out of the Pressure (boost) sensor. It should be the brown/red wire for an s4 (i think it 2a in the ECU plug) i think it is green/yellow pm the S5 but don't quote me on that. The best way to tell is to use a voltmeter at the plug and a vac/pressure tester on the hose (my-t-vac is great). Test voltage with the ign on, car off. test the voltage on the wire should read like 2.4 but again don't quote me. Pull full vacuum on the hose going INTO the sensor, it should read much lower voltage. Now give it some pressure going into the hose (not too much!!!) it will read above 2.4 (should be 5 volts at 1 bar i believe) So now that you have found the right wire just splice it in. If you have a fuel cut defensor atach it before the blue wire befor the FCD. In other words between the pressure sensor and the FCD.
The afc should read the correct pressure without any calibrating. On the S5 you should be able to tune the sucker using the TPS like its supposed to. On the S4 its a bitch. Use like 96% for low 97% for high.
If you want to tune via booste that is when you connect the grey wire AND the blue wire to the pressure sensor. You can test the settings for high/low fuel and figure it out that way.
I never used the boost for this so I cant help too much.
i would figure that if 40% ish is 0 Psi idle would be like 20ish? You should be able to read it on the display. I would set low for what 0psi reads and say high at 8psi. that way it will ramp up in that range.
GL I'll check back
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11-27-07, 08:13 PM
#8
ya but my tps wire is gray. my blue wire is only for if its in a twin air sensor type car like a skyline.
my blue wire is for intake. my gray wire is for tps. so. dont i use the tps wire on the boost sensor priro to my fcd?
this way i can have the high and low be acording to boost not throttle
i dont understand why i would have to hook up the blue wire since i sent it to flap sensor . thus it doesnt even need the blue wire...
sorry. i am a bit new to this.... it just doesnt make sence
my blue wire is for intake. my gray wire is for tps. so. dont i use the tps wire on the boost sensor priro to my fcd?
this way i can have the high and low be acording to boost not throttle
i dont understand why i would have to hook up the blue wire since i sent it to flap sensor . thus it doesnt even need the blue wire...
sorry. i am a bit new to this.... it just doesnt make sence
11-28-07, 12:37 AM
#9
The only reason to hook up the blue wire it to show pressure. Basically it makes a nice boost gauge. Its not needed, just nice. So yes if you want to read the grey (tps) wire by the pressure sensor, you just hook up to the B/R wire on the pressure sensor wire.
12-01-07, 07:05 AM
#10
Rotary Freak
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my blue wire is only for if its in a twin air sensor type car like a skyline.
Im going to have to do this only because I can't find where I can monitor it without selecting "pressure" instead of "flap" in the setup on my SAFC2. If I find it works on the SAFC2 I will add this setup to my manual.
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