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Old 06-11-2002, 12:10 AM   #1
redmeanie
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Question Air/Fuel Mixture Gauge?????

Anyone know the correct pinout or color wire off the ECU on a 2001 2.5RS to hook a AFR gauge too? There are 4 different signal wires off the front O2 sensor by a pinout schematic I have...I believe it is the B136 #7 if these are the official numbers from Subaru on this schematic I have...I've heard 2 different answers...Any one know for sure? Thanks
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Old 06-11-2002, 12:53 AM   #2
North Ursalia
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Well, the first thing you have to tell us is if you have a narrow (0-1v) or wideband (0-5v) air-fuel gauge. If it's narrow-band, you are already barking up the wrong tree by trying to use the front O2 sensor- you'll blow the gauge out .


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Old 06-11-2002, 02:13 AM   #3
JulianH
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He says he has a 2001, so that would be a wideband. Unfortunately, no one has made an inexpensive WB A/F gauge, and the gauge redmeanie has will almost certainly not work. I personally use the "blue wire mod" on my AFC to watch my A/F, and it works pretty well, but it's definatly not as nice as a dedicated gauge would be. It seems more and more cars are coming with WB O2 sensors, so someone may come out with a WB A/F gauge someday, but until then we'll just be looking at homebrew solutions.

JulianH
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Old 06-11-2002, 12:43 PM   #4
North Ursalia
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Yes, the front O2 sensor on a 2001 RS is wide-band, but the rear is narrow-band. I'm trying to find out what type of gauge he has- if it is meant to read off a 0-1v O2 sensor, it will blow out when hooked up to the front O2 sensor (0-5v). Chances are it is a narrow-band gauge for a narrow-band sensor, but it makes a big difference in which wires to tap off of the ECU .


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Old 06-11-2002, 02:56 PM   #5
redmeanie
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Lightbulb Thanks....

Im just going to add a auto meter o2 sensor to use with with auto meter A/F gauge.....I have the exhaust out and a guy at the muffler shop is going to hook me up with welding in the lug....
Thanks for the input....
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Old 06-11-2002, 03:49 PM   #6
HndaTch627
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FWIW the A/F meter's are almost useless on a turbocharged car, you'd be better off getting the actual wideband guage that greddy makes but still EGT's are the best method for tuning IMO

jeremy
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Old 06-12-2002, 12:07 PM   #7
RallyNavvie
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I don't know about tuning with EGTs only. I'd say a good combination of the two is best. I mean a lot of people don't know where their EGTs should be on the car until after they install the EGT, which is often done at the same time the turbo is put on. If you don't know what your EGTs are supposed to be it doesn't help you any.

OTOH A/F voltage is finite among all cars. You're shooting for about .80v on WOT (or ~4v on a wide-band). I did all the tuning on my Haltech maps via A/F voltage and that included more than just WOT settings (of course I can turn off closed loop for that). I use the EGT as a back-up to tell me how the maps are working during daily driving, but I still adjust the fuel trim according to my A/F voltage. If the EGTs start advancing a little too much I double-check my A/F to make sure it reads OK. You'd be surprised how accurate even a narrow-band sensor is.

I've been doing tuning with my fuel trim knob much like the mixture trim on an airplane. I lean it back until it just starts to drop RPMs and then richen it back to peak. That's basically your optimal A/F mixture right there. But it changes with intake and coolant temps so I adjust it ever so often as I'm driving. Makes me feel like I'm in the cockpit again

~Garrett
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