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Old 04-05-2003, 05:58 PM   #1
DangeRS
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Default o2 sensor reading?

Ok i am installeing an safc and i would liek to know the reading our 02 sensors make in 3rd gear pull? and then reading the 02 sensor is at idle? this is for a 01 rs.... thanks...
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Old 04-06-2003, 08:29 AM   #2
ChicksDigWagons
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At idle the O2 should bounce between .1 and .9v back and forth. In a 3rd gear pull expect somewhere between a .6 to .8v reading usually. Narrow-band O2 sensors aren't the most accurate of devices!
-Brad
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Old 04-08-2003, 12:14 AM   #3
DangeRS
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anything else? i woudl liek to know what to look for on the safc in order to tune it properly...

what readings for egt and the volt for the 02 reading
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Old 04-08-2003, 10:36 AM   #4
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You need an EGT gauge and a wideband (5V) O2 sensor/gauge to do any real tuning. You can use your stock sensor as a guide but it will not be acurate. When the car enters open loop it ignores the O2 sensor anyway.
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Old 04-08-2003, 01:20 PM   #5
DangeRS
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I am going to purcahse a egt gauge... i jsut wanted to know what numbers i should be adjusting the safc to, thats all... what Voltage and temp for teh egt and the wide/band o2 sensor readings....

i have intake , high flow cat, and full ehaust and will be getting headers soo.... i wanted to learn how to tune it knwo gradually and know what to look for. Thanks
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Old 04-08-2003, 01:32 PM   #6
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Best advice I have for you is to take is slow. start leaning out the mixture slowly and listen for detonation. When you have your EGT you can get more aggressive, till then take it slow.
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Old 04-12-2003, 07:17 PM   #7
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Ok, my safc is installed, under the Hot-Wire senor correct? now for the sensor check for the in-1 what should i be looking for? what shoudl the voltage be coming for the 02? i know peopel have safc's on their subarus.... what #'s do you all try to get when tunning your safc.. i know it wont help out much but when i get teh egt and the af gauge.... i can know what to look for....so anyone? if you all are not tunning your car then teh safc is pointless to have, its just for looks...... so let me know, thanks
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Old 04-12-2003, 08:42 PM   #8
Eric SS
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You have to make sure you use your REAR O2 sensor. you can;t use the front one on the S-AFC at all.

And if you do use the rear O2 seonsor, that won;t be accurate either because the exhaust has been catalyzed by then and the O2 is to far away to give accurate readings.

In short, the O2 function on the S-AFC is pretty much useless.
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Old 04-12-2003, 10:42 PM   #9
DangeRS
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HA, thats what i thought but i didnt understand, i knew soemthign was up.......So my best bet is get a egt gauge...and then get it tunnned at a local shop correct? a wideband 02 is to much money for me.... am i right on what to do? what else do you safc rs impreza people do? thanks
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Old 04-12-2003, 11:14 PM   #10
Eric SS
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Yeah, get an EGT gauge.
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Old 04-12-2003, 11:16 PM   #11
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where do you tap that into on the headers? my freind with his dsm said they tap it off the first runner.... thanks, this is for a 2001 impreza rs gm6 bodystyle too...... thanks
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Old 04-14-2003, 09:56 AM   #12
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Tap cyl #3 ~3" from the flange.
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Old 04-14-2003, 05:17 PM   #13
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http://www.racingknowledge.org/forum...?TOPIC_ID=1011

i read that, its for dsm's but i got a jist on tunning...

now the Net for the safc on my car should be at 0% because right now its reading 10% for 1 and 2

plus that thread talks about timing, so a itc would be needed? and it says how the egt and af gauge is pointless.... is this true or just not for na cars or what? thanks BOY and everyone.... would should do soemthign similar to what that thread consists of but for a na 2.5 engine motor tunning the safc! ha
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Old 04-14-2003, 05:26 PM   #14
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A/F gauges are a tool, not a very good one, but a tool nonetheless. Our engines are very sensitive to knock, or rather, our pistons are very sensitive to knock. If you can hear knock it may be too late. I got lucky this past weekend, I've had some minor knock issues (barely audible) but it was very warm this weekend and I got KNOCK, very loud, very scary. My timing was keeping EGTs in check but I was just running too lean for the temp conditions. Problem solved and, thankfully, no damage.
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Old 04-15-2003, 01:30 AM   #15
Kevin Thomas
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Default DangeRS

Quote:
Originally posted by DangeRS
i have intake , high flow cat, and full ehaust and will be getting headers soo.... i wanted to learn how to tune it knwo gradually and know what to look for. Thanks
DangeRS,

Go here: Road Race Engineering

This site will have all the answers you are looking for. I used it when tuning my car. It's mainly geared for a turbo setup but it'll help you greatly and increase your understanding on EXACTLY how to tune with your SAFC. Others I'm sure will feel differently but it worked great for me. Tell us if the site helped you at all. Good luck!

BTW: I tuned with an Apexi SAFC, Jumptronix A/F ratio meter, and VDO EGT gauge.

Last edited by Kevin Thomas; 04-15-2003 at 01:36 AM.
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