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Old 05-15-2000, 02:10 PM   #1
Max
Scooby Newbie
 
Member#: 788
Join Date: Jan 2000
Chapter/Region: NWIC
Vehicle:
2008 Evo X GSR

Post SAFC Question

Does anyone know how to tune the SAFC using the 02 sensor value? Like, whats a safe reading? How low is too low for gas mileage type driving? Which way is lean or rich? The Apex'i manual pretty much sucks nooksack.
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Old 05-16-2000, 05:42 AM   #2
SteveS
Scooby Specialist
 
Member#: 6
Join Date: Jun 1999
Location: South Jersey
Vehicle:
2007 BMW Z4 M Coupe
Interlagos Blue

Post

The manual does suck, but in its defense, the S-AFC is not intended to be used for monitoring the A/F ratio (off the O<sub>2</sub> sensor). I'm assuming you've done the "Blue Wire" mod as far as hooking into the O<sub>2</sub> sensor.

When idling or cruising, the readings should bounce around between 0.0 and 1.0v. In reality you probably won't see above 0.9v when it's in this state, closed loop. Under WOT conditions, you should see the readings stabilize above 0.83v. If you are running NA, anything above 0.80v is probably safe. If you see this number drop below 0.80v under WOT conditions, your car is running lean.

Hope this helps.

SteveS
http://www.lagging.com
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Old 05-16-2000, 06:36 AM   #3
HRE | giulio
Former Vendor
 
Member#: 481
Join Date: Nov 1999
Location: NY USA
Exclamation

i thought it was .85 - .87 ?
Oh yeah, for MY00, you have to use a diff # entirely, but i dont know what it is.
g
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Old 05-16-2000, 07:13 AM   #4
SteveS
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Member#: 6
Join Date: Jun 1999
Location: South Jersey
Vehicle:
2007 BMW Z4 M Coupe
Interlagos Blue

Post

giulio ~~ I was stating what I feel to be absolute minimum readings. I really think that if the car is NA, then 0.80v is the MINIMUM reading I would want to see. Targeting 0.85v+ is what should be done. Thanks for clearing that up.

And yeah, MY00 first O<sub>2</sub> sensor is a wide band sensor. The 0.0-1.0v range is not applicable.
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Old 05-16-2000, 11:42 AM   #5
HRE | giulio
Former Vendor
 
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Join Date: Nov 1999
Location: NY USA
Post

so is it safe to run at .83v at all rpms?
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