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Old 01-02-2009, 09:05 AM   #1
Scooby Newbie
Member#: 177589
Join Date: Apr 2008
Default af question

on a 93 legacy ss, i installed a the "defi" narrowband afr gauge. just hook up power,ground, dimmer and signal of the o2. it would appear to work ok except- i never see the gauge indicate anything richer than 14/1 and i see it go lean often. by often i mean allmost every time i get off the throttle it reads 16/1 or so. i use a greddy rs bov. vented to the atmosphere. and i had expected to see a little bit of rich as i blow off the metered air?
i had also installed an apexi afc2 and had intended to try and compensate for the bov with. anyone useing an Apex afc2 for anything other than a decoration?
i can use some advice setting the "dec. air" function to prevent stalling.
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Old 01-02-2009, 09:27 AM   #2
Sammo Hung
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: S Ga / N Fla


well you should have seen richer afr's
let say 10:1 at wot under boost. or afr's close to 11:1.
but at lifted throttle you will see afr's leaner
than 14.7:1..

did tune another legacy SS with afc..
limited tuning points but did get the job done.
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Old 01-02-2009, 10:41 AM   #3
NASIOC Supporter
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Boise,Idaho,USA
The 93 W/EJ20K
Series 10 FRS


the narrow band o2 sensor is useless for what your doing ...it will only accurately measure stoimetric
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Old 01-02-2009, 01:25 PM   #4
Scooby Specialist
Member#: 16819
Join Date: Mar 2002
Chapter/Region: SCIC
Location: Lake Elsinore, CA

Yep, ignore any 'numbers' on the gauge. If it moves one way when you step on it, then moves the other way when you let up, it's working to the best of it's ability.
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Old 01-03-2009, 11:32 AM   #5
Scooby Newbie
Member#: 177589
Join Date: Apr 2008

yeah i run as much as a bar with the OTB function of the profec and i have the stock vf11 and stock pinks. to my surprise the only time i see the gauge go lean is when i am off the throttle all together. i am now taking a guess that the ecm cuts injectors in that situation. i also notice that despite popular postings i have an aem dryflow cai, snorkus delete but with 3in. aluminum tube not a coffee mug, Saab 900 tmic. on the afc i monitor maf voltage % and it doesn't max out still if boost is set to 1 bar and i shift at 5500. and then you say narrow band is crap and i need a wide band huh? and the setting up of the dec. air function to prevent stalling with atmos.bov?? does anyone know about that?
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Old 01-15-2009, 06:37 PM   #6
Scooby Newbie
Member#: 178538
Join Date: Apr 2008
Location: toronto

yup RallyColtTurbo's right u'll need a wideband to read accurately
plus how did u splice the signal wire?
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Old 01-16-2009, 09:05 AM   #7
Scooby Newbie
Member#: 177589
Join Date: Apr 2008

I tapped into the o2 signal wire @the ecu
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