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Old 04-05-2007, 12:14 AM   #1
mneste8718
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Default Is my wideband calibrated correctly?

Well I got an LC-1 and Prosport AFR gauge. I programmed the LC to actually show wideband figures on the gauge. In either case when I am light on the throttle just so the engine doesn't slow down the car, I am getting 16:1 AFR. Is that possible? I did log it through my laptop and that is in fact what I am getting. My EGTs never go beyond 1500F on cylinder 4 (about 4 inches from the actual cylinder). This seems weird, but could perhaps WRXs run lean under such conditions and be safe? On a side note, when I was putting in the EGT bung, I saw that my exhaust valves are white and I saw on another thread that it could be running lean because of that indicator (I don't remember what was the conclusion of that thread). I am tuning through Enginuity running a Stage 2 map at almost 19psi (No knock, AFRs seem good under load, though I am doing more testing currently).

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Old 04-05-2007, 12:28 AM   #2
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if it never reads 14.7:1 when cruising or idling, then its either not calibrated or you have more tuning to do. if it does read 14.7:1 when cruising and then 16:1 during that one condition then thats not good.. i dont think the engine should run that lean on regular gas even when cruising. white exhuast valves could indicate that lean condition, but that might be from your full throttle pulls more likely if they read anything like spark plugs lol
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Old 04-05-2007, 12:30 AM   #3
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sometimes at like 1% TPS my car exhibits this condition SOMETIMES.. where the engine note basically disappeaers and start afterfiring very subtly.. i dont think its good to ride that line so to speak. im not sure whats happening, maybe its too little fuel for my injectors to effectivly inject.
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Old 04-05-2007, 12:37 AM   #4
mneste8718
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hmm well when I press the throttle enough so that the vacuum is decreased by half from that condition, then the gauge shows 15:1 (and considering that the gauge reads in .5 increments, most likely it is at 14.7). I guess I have to run some logs first
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Old 04-05-2007, 12:37 AM   #5
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Well, what did it show when using the stock tune? To me that's the baseline I'd be looking at.
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Old 04-05-2007, 12:38 AM   #6
mneste8718
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basically for me to show that 15:1, I have to be slightly accelerating on a flat road...
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Old 04-05-2007, 12:39 AM   #7
mneste8718
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yea, perhaps I should reflash to stock and see what I get then
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Old 04-05-2007, 12:53 AM   #8
mneste8718
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One question though, the way that the instructions for the LC-1 show it, you have to have the O2 sensor out of the downpipe to have it calibrated. But then it also calibrates the heat range that it operates in at the same time. Now how is it supposed to do that if it is out of the car and the car is not running or warmed up for that matter.
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Old 04-05-2007, 01:00 AM   #9
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IIRC, the LC-1 has 5 wires. Two of those are for the heater.
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Old 04-05-2007, 07:37 AM   #10
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The LC-1 can be calibrated while mounted in the exhaust. They recommend doing so after the engine has been off for an extended period of time. This allows oxygen from the atmosphere to reach equilibrium in the exhaust piping.

What does your AFR gauge read while steady cruising at about 65-70mph?

Last edited by bucket7788; 04-05-2007 at 07:38 AM. Reason: added question
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Old 04-05-2007, 12:07 PM   #11
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My gauge (xd-16) reads 14.7 +-.2 at cruising FYI....I would always calibrate the wbO2 in free air first then inside ur exhaust for the heater calibration...thats what Innovate recommends

FWIW, I never go higher than 14.8 on any throttle input...
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Old 04-05-2007, 12:23 PM   #12
mneste8718
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Well here is a log....



The green highlight is a 3rd gear pull, and from what it looks like, I am running good AFRs under load
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Old 04-05-2007, 12:24 PM   #13
mneste8718
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Quote:
Originally Posted by mpggomd View Post
My gauge (xd-16) reads 14.7 +-.2 at cruising FYI....I would always calibrate the wbO2 in free air first then inside ur exhaust for the heater calibration...thats what Innovate recommends

FWIW, I never go higher than 14.8 on any throttle input...
I thought that when the O2 calibrates in free air, it calibrates the heater as well.. What procedure do you follow?
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Old 04-05-2007, 12:28 PM   #14
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Quote:
Originally Posted by mneste8718 View Post
I thought that when the O2 calibrates in free air, it calibrates the heater as well.. What procedure do you follow?
Sometimes you still need to calibrate the heater...but usually once you do the free air calibration, the heater calibrates automatically while it warms up...
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Old 04-05-2007, 12:39 PM   #15
mneste8718
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I think this might be a better representation of the log. This is me starting the car on a cold day, driving in traffic, where I idled, cruised, and had 2 3rd gear pulls. Here are the stats...



What I forgot to mention is that the welder didn't weld my bung perfectly for the O2, meaning that there is some exhaust escaping. Could at idle, air be possibly getting in through the 'cracks.' The reason I say this is that when I am flooring it, I am getting very good AFRs...

Last edited by mneste8718; 04-05-2007 at 12:52 PM.
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Old 04-05-2007, 01:28 PM   #16
mpggomd
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Definetly get that bung re-welded then see if you still have the problem!
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Old 04-05-2007, 11:45 PM   #17
bucket7788
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Yes! An exhaust leak is very likely the culprit.
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Old 04-08-2007, 07:50 PM   #18
mneste8718
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Well I drove home doing 75mph and the gauge was showing 15:1 AFR and considering that it counts in .5 increments and 14.7 would round to 15, and so I am guessing that the leak in the bung is causing the misreadings....
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