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Old 02-13-2006, 09:35 AM   #1
ScoobySnacker
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Default Reading a/f ratio?

I just realized i posted this previously in the wrong forum..I will be getting an innovative wideband gauge this weekend..What are the basics for reading a/f ratio? What is the target range? How do i tell if the car is running rich or lean? Can knock be determined by the gauge? Im not new to cars, just new to the turbo thing. any info would be appreciated!

P.S- I have an 03 wrx
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Old 02-13-2006, 10:46 AM   #2
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Old 02-13-2006, 11:26 AM   #3
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Thanks
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Old 02-13-2006, 12:01 PM   #4
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Does this also determine engine knock?? And what are the target a/f readings for the wrx?
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Old 02-13-2006, 12:03 PM   #5
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no, it's best to use a knock sensor.

AFR's depend on the tune, load & fuel map .

Last edited by Quack; 02-13-2006 at 04:17 PM.
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Old 02-13-2006, 01:07 PM   #6
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at the moment i have TBE, do i really need to worry about my AFR right now, or should i just worry when i get EM.
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Old 02-13-2006, 01:26 PM   #7
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Quote:
Originally Posted by Quack

AFR's depend on the tune, which fuel map its in and LOAD
fixed that for ya
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Old 02-13-2006, 01:56 PM   #8
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Quote:
Originally Posted by ScoobySnacker
Does this also determine engine knock?? And what are the target a/f readings for the wrx?

targets will depend type on gas and level of mods, but generically speaking targets are 14.7:1 at idle and light cruise. Light throttle (7psi) they will begin to get rich, 12:1, getting richer near redline, anywhere from 11.5:1 to 10:1 depnding again on gas etc.

I would personally not worry about AFR's on a professionally tuned car. If you want to get it just to "see" what they are, that's a fairly expensive imagination. If you plan on tuning your car yourself at some later date, then you'll need it anyway. If you don't plan on tuning the car yourself, save the duckets and spend it on a professional tune and get an EGT system for day to day monitoring.
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Old 02-13-2006, 04:16 PM   #9
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Originally Posted by hondaeater69
targets will depend type on gas and level of mods, but generically speaking targets are 14.7:1 at idle and light cruise. Light throttle (7psi) they will begin to get rich, 12:1, getting richer near redline, anywhere from 11.5:1 to 10:1 depnding again on gas etc.

I would personally not worry about AFR's on a professionally tuned car. If you want to get it just to "see" what they are, that's a fairly expensive imagination. If you plan on tuning your car yourself at some later date, then you'll need it anyway. If you don't plan on tuning the car yourself, save the duckets and spend it on a professional tune and get an EGT system for day to day monitoring.
So you believe that having wideband is not worth it if i am not going to tune my own car?? I get confused beause other people here say that cobbs maps can sometimes not be safe, and i dont want to ruin my motor.
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Old 02-13-2006, 04:41 PM   #10
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Originally Posted by ScoobySnacker
So you believe that having wideband is not worth it if i am not going to tune my own car?? .

that's exactly what i'm saying. The money you spend on a WB, you could put towards a custom tune, which they use a WB when tuning, they will get your car into a "safe" tune and you're good to go. Some OTS maps are not safe. . .that's why you get your car professionaly, custom tuned.
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