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Old 10-24-2004, 10:22 PM   #1
robsgotit
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Question safc-blue wire-.840or.084?

when running the blue wire mod, is stoich. .840 or.084?
2. ive read threads about tapping the first o2, i was told to tap the second(rear)o2, is that correct on my02 2.5rs?
3. right now thru the rpm range im reading .110 to.084(no corrections made, just monitoring)does adding fuel bring the volts up or down?

ive searched and cant find any clear answers to these questions, any help would be great
thanks, rob
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Old 10-25-2004, 12:42 AM   #2
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Adding fuel should bring the voltage up. I believe you want to tune for .84v. Stoic will be less voltage, you want to be a little above stoic, don't you?

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Old 10-25-2004, 06:39 AM   #3
robsgotit
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im still a bit unclear about this, so its to read .084v right?
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Old 10-25-2004, 07:03 AM   #4
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Or around there......

Jay Storm

Edit: .840 is the voltage you want. drop the zero off the end and remember 8/10ths of one volt. You got me confused by constantly going back and forth.....

Last edited by Storm; 10-26-2004 at 11:47 PM. Reason: your noobness got me confused
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Old 10-25-2004, 08:49 AM   #5
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.84 not .084. You want it to read slightly above stoic because the SAFC adds a little resistance to the signal itself.
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Old 10-25-2004, 10:29 AM   #6
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Quote:
Originally Posted by BlkTS02
.84 not .084. You want it to read slightly above stoic because the SAFC adds a little resistance to the signal itself.
Slight difference...
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Old 10-25-2004, 12:17 PM   #7
robsgotit
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ok im really confused now, there are 3 # spots, it would either say .084 or .840, you guys keep saying .84?
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Old 10-25-2004, 01:49 PM   #8
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.840
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Old 10-25-2004, 06:29 PM   #9
robsgotit
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thank you, so im running really lean right now right?
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Old 10-26-2004, 10:14 AM   #10
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it would seem like it, but there really shouldnt be any reason for you to be running that low! maybe a connection is messed up. what intake are you using? Im using the cobb intake, i have found that generally the 02 ecu does a pretty good job of keeping the car in the right area. I see my volatage climb quickly from .1xx up to .7xx ish and hit about .800 around 5,000 rpms. I also have not noticed much of a change when i add fuel to get the car up to .84 throughout the revs. We will see what happens when i get the spicey cams in there. I plan on getting rid of the safc2 once cobb releases a reflash.
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Old 10-26-2004, 11:08 AM   #11
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Quote:
Originally Posted by Pat L.I.
I plan on getting rid of the safc2 once cobb releases a reflash.
That'll be nice, but don't hold your breath. I don't see them giving our cars much attention with the WRX and STi as their primary focus.
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Old 10-26-2004, 12:19 PM   #12
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pat l.i, my connections are mint, i am running a "gonzflow" type cold air, with an spt axleback,, my blue wire is tapped into the rear o2, is that how yours is setup?
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Old 10-26-2004, 01:42 PM   #13
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yes i am set up the same way, just with a cobb intake.
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Old 10-26-2004, 03:14 PM   #14
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Using the rear oxygen sensor is pointless if you have a cat in place.
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Old 10-26-2004, 10:54 PM   #15
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is that true, i tapped into the rear cause thats what i was told, it doesnt really make sense, the first o2 should be more accurate right?
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Old 10-27-2004, 08:58 AM   #16
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i believe the front sensor does not have the same voltage output therefore you cannot use this one. Most people just go to the rear because its the best they can do for what they have. Optimally you would want to install a wideband O2 before the cats.
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Old 10-27-2004, 12:14 PM   #17
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yeah thats true, so what are your fuel corrections at now when your hitting .840v, ive heard of people running up to 27%
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Old 10-27-2004, 04:16 PM   #18
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I currently have it un-tuned, i threw a check engine light at my last autocross and it was idling all erratic so i zero'd everything out. and set the pressure sensors back to 10 10.

but when i was playing with it i have had it up to about 27 and i threw a check engine light. never got the code pulled so im not sure what it read. Although i have to say i didnt notice much of a difference in the way the car pulled, and i also had a tough time getting it to read .840 i mostly only got up to about .7xx pretty steadily.
eh.. like ive said, im gonna see if this thing does anything with cams in there, possibly have it road tuned by a shop, i think they have a computer they can plug in to match an exact a/f ratio. Other than that, im on the reflash waiting line. I-speed is looking promising but i dont believe they flash through the odb-II port which i would prefer.
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Old 10-27-2004, 05:36 PM   #19
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yeah, i bet it would do nice with cams, i was playing with mine on the way home today, i had it up to 15% and my reading was still .110v im thinkin maybe i have the blue wire hooked to the wrong wire on the ecu?
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Old 10-27-2004, 07:17 PM   #20
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My setup with an Injen CAI also runs super lean. I have to go over 20% extra fuel to get it in the .84V range. I had to go to 27% with the rallitek J tube intake.
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Old 10-27-2004, 11:40 PM   #21
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Have you done some tuning with this yet?
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Old 10-28-2004, 07:17 AM   #22
robsgotit
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never on a dyno, ive played with it though, i helped a freind boost a b18 vtec, and the only way to give it the fuel it needed was to install a safc, he had a air/fuel gauge though, it was a bit easier
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Old 10-28-2004, 08:50 AM   #23
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if he had the standard a/f guage that is just a bunch of lights bouncing around, your blue wire mod is doing the exact same thing except giving you a voltage readout. I have an autometer a/f guage (read - semi-useless), it hooks up to the same sensor as the blue wire mod, except converts the voltage reading to a color display.
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Old 10-28-2004, 09:13 AM   #24
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Exactly. The way to go is to get a wideband O2 sensor, but I would like one that can also output the 0 - 1V my ECU needs to stay happy. I know they exist, but wouldn't know where to buy one and how to hook them up. Ideas?
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Old 10-28-2004, 11:33 AM   #25
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You can get a PIC board and program it ot "scale" the inputs, and output 0-1V for your ecu. Just a little soldering and some minor programming (PIC boards are faily easy to program, and there are very user friendly interfaces for porgramming them).

cheeRS,

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