Under Sensor Check, we get three readings ie:

In-1: measures volts from AFM
In-2: ???
Throttle: Set at 1V.

Whats 1n-2 measuring? I am getting a voltage reading from It. Anybody have the same concern?

 

Thats the second afm input if I remember right. (been a long time since I looked at any of the wiring diagrams)

I also get a very slight voltage reading off of it, but according to the manual thats normal.

 

Thanks for the respone Jimmy. But, as you know, we don't have a second AFM.

 

Yes, I'm well aware of that.

Apexi has all kinds of info on their site in the tech section under manuals. (not sure if you knew that)

 

If wired correctly according to Apexi that value should read zero. However lots of us spliced the wire into the O2 signal and then that value will equal the O2 sensor voltage.

 

Actually, IN2 is input from the blue wire from your safc.
What I did was hook that wire up with the 02 sensor wire and that becomes your new A/F gauge. Pretty neat.
Tony, give me a call if you need help.
Later.

 

I understood that the Blue Wire, although hooked up for the O2 Sensor, was not suggestable. Someone had posted It before. I figured I have a A/F Ratio so I never bothered with that wire.

So you guys are using the Blue Wire, eh?

 

Jimmy, I read the photocopied Instructions again and It made no reference of voltage from In2 being the norm.

 

Cause it's in their trouble shooting section.

I'll see if I can find it again...

 

From the Apexi Tech Q&A section:
Q SUPER AFC: I heard somewhere that the Super AFC can be used as an O2 voltage monitor.

A The AFC is not to be used as an O2 voltage monitor. We do offer the Auto Timer with O2 sensor voltage and theoretical air/ fuel ratio monitor.


Hummm... Can't find the section on stray voltage readings off the unused lead. Might have been on a yahoo board or something.

But the Blue wire is the one you'd hook up for runing this as a monitor. Just set the parameters for a single AFM and you should be fine. I think they just don't want people ******* up their cars from thinking they have a damn skyline twin turbo and hooking it all up as such.

 

You got me wondering now...to bad no Identity on It's voltage presence. Thanks.
rx7_turbo2 and pd day are running the blue wire to the O2 Sensor. Anyone else running this as Gauge?

I'll call the tech guy tomorrow and add to this thread.

 

To add, this Is off Apexi's Q&A too.

In-1 is the voltage of the first sensor, while In-2 is the voltage of the second sensor. In-2 will only be used on the Skyline GT-R and will almost never be used in the USA

This too, form Suburu's Q&A, In relation to the S-AFC. Cheers sent this to me awhile back. http://wac.addr.com/auto/obs/safc/safc.html

 

Called Apexi today. I mentioned to the tech guy that I am getting a reading of In2. He went on to say that was normal, as Jimmy suggested. Apparently, the fluctuation of the AFM and TPS voltage creates a minor voltage fluctuation to In2. As a result, we get a small voltage reading. Nothing complicated their.

As for using the 1n2 for O2 Sensor output, he said although we don't commonly agree that It's suggestable to use this for the purpose of the O2 Sensor, although we have seen many people use It for this. He also went on to claim that no one experienced any adverse effects from doing this.

Perhaps I'll pull out my trusty soldering gun this weekend.

 

I believe many Supra owners use that wire for what they call the "O2 mod". post the question on supraforums, as I think quite a few are using it. Carl Byck

 

sorry to ask but can i use the SAFC on my GXL?

if so what will this allow me 2 do?

thanks

 

the safc is a fuel controller ya you can but there is no need untill you go crazy with mods on an NA or upgrade you injectors

 

Woah,
haven't read that site in ages... thanks for brining it back up.

Too bad i still dont' have my safc... STUPID H2motorosports...

 

I understand that with the "blue wire" mod - DSM'ers have proven that it can load the output of the O2 sensor a bit and cause false readings.

 

but the 02 sensor doesn't do anything other then control closed loop operation. What would loading the 02 sensor have to do with performance gain?

The main thing causing you u to get out of closed loop is the gas pedal and your foot.