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Wideband o2 sensors?????????

Old 03-29-2005, 11:58 AM
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Default Wideband o2 sensors?????????

I feel like such a noob with this question, but if and when I go to dyno tune my car and I want to use their Wideband, do I need an extra bung for it, or can I just take out the factory sensor for tuning and then put it back in when it's all done.

Management is 450 dsm's and V-afc.
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Old 03-29-2005, 12:07 PM
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Default Re: Wideband o2 sensors?????????

best if you have an extra bung, most dynos have sniffer pipes though if you dont
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Old 03-29-2005, 12:32 PM
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Default Re: Wideband o2 sensors?????????

Ya, I wonder the accuracy of those sniffers due to the tempreture drop by the time you reach the tail pipe. I know they're self heated O2s, obviously, but I wonder if EGT plays a part in air:fuel ratio... hotter air, less dense, more saturdation of fuel? Hrm, ..anyone?
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Old 03-29-2005, 01:36 PM
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Default Re: Wideband o2 sensors?????????

Originally Posted by TurboEF9
Ya, I wonder the accuracy of those sniffers due to the tempreture drop by the time you reach the tail pipe. I know they're self heated O2s, obviously, but I wonder if EGT plays a part in air:fuel ratio... hotter air, less dense, more saturdation of fuel? Hrm, ..anyone?
i've always wondered the same thing but I was under the impression that it was corrected for somehow
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Old 03-29-2005, 01:36 PM
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Default Re: Wideband o2 sensors?????????

yeah i have been wondering the same thing. i think you should be able to take out your stock o2 if you have it diabled in your .bin right? then put it back in when your done.
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Old 03-29-2005, 02:17 PM
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Default Re: Wideband o2 sensors?????????

Most dyno operators know that a tail pipe sniffier will read a little leaner (a point or two) but they know there specific setup well. So if the sniffer is readin 14, they know that if they had a WB in the downpipe, it would be reading 12...get what im saying?
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Old 03-29-2005, 02:24 PM
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Default Re: Wideband o2 sensors?????????

Ya.. but.. exhaust pipe length, diameter, number of resonators, muffer size.. cat/no cat, would ALL play a part in an accurate tune.

...do you get pegged with all of those questions on sniffer tube dynos? The ones I have been to haven't said anything about that.
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Old 03-29-2005, 02:56 PM
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Default Re: Wideband o2 sensors?????????

Originally Posted by TurboEF9
Ya.. but.. exhaust pipe length, diameter, number of resonators, muffer size.. cat/no cat, would ALL play a part in an accurate tune.

...do you get pegged with all of those questions on sniffer tube dynos? The ones I have been to haven't said anything about that.
ive only asked at the two i have been two, they both said they knew their sniffers well enough to know approx what the actual AFRs were based on the readings.

i think post cat screws it up even more, im not even sure you can get accurate readings with all the moisture in the mixture after a cat
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Old 03-29-2005, 02:59 PM
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Default Re: Wideband o2 sensors?????????

Luckily I have no cat.
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Old 03-29-2005, 04:16 PM
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Default Re: Wideband o2 sensors?????????

yeah I have no cat either, straight pipe all the way. I eventually would like to own one so I think if I can I would weld a second bung, but I guess for the dyno I don't need it, they'll use the tailpipe thing.
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