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Old 10-02-2002, 08:32 PM   #1
DarthChicken
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Talking UTEC Question

First of all... awesome unit. Just thought I'd get that out of the way up front

Ok, one of the things I noticed in the manual, was the dip switches, and what those settings mean. Two of the switches are very interesting to me - the ones that control whether the front or the rear o2 sensor is used. Default is rear o2 sensor, if I'm reading this correctly.

What happens if you move this to front o2? Seems as though you'd have a LOT more accurate numbers, being its a wide band sensor instead of a narrow band. I have a turbo timer hooked up to my rear o2 (or rather.... did up until 5 minutes ago), but I know with the LINK, when I'd tune the turbo timer would actually screw up the voltage.

Same with the UTEC I would imagine. And since the number is given as an A/F ratio, I can't tell which sensor is REALLY being used here.
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Old 10-02-2002, 08:35 PM   #2
crazyhorse
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Sorry to highjack your thread.. but if you noticed our thread about the new site, would you be so kind as to upload your maps sometime? Any data logs would be great.. My UTec gets here on Monday so I'd love to have a little information before I start tweaking it.

I didn't think the stock front O2 was a wideband... If you've got an aftermarket one up there, I'd definitely tune off of it. My rear seems to be fairly accurate from what I've seen.
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Old 10-02-2002, 08:42 PM   #3
subix
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Quote:
Originally posted by crazyhorse
I didn't think the stock front O2 was a wideband... If you've got an aftermarket one up there, I'd definitely tune off of it. My rear seems to be fairly accurate from what I've seen.
Actually the front o2 sensor on the rex is wide band. And from what I hear the rear o2 is really inacurate seeing it only works in a small af ratio and its behind 3 cats...

-Subix
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Old 10-02-2002, 08:48 PM   #4
crazyhorse
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Learn something new every day.. Thanks for the info. Still getting used to having a flat 4. Then again.. my rear O2 is only behind 1 cat. Hrmm.. wonder where I read that I should tap into the rear one for my a/f gauge. Have to change that.

Thanks again!
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Old 10-02-2002, 09:25 PM   #5
SFastWRX
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The front O2 sensor is not true wideband.

Last edited by SFastWRX; 10-02-2002 at 09:31 PM.
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Old 10-02-2002, 10:28 PM   #6
subix
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Quote:
Originally posted by crazyhorse
Learn something new every day.. Thanks for the info. Still getting used to having a flat 4. Then again.. my rear O2 is only behind 1 cat. Hrmm.. wonder where I read that I should tap into the rear one for my a/f gauge. Have to change that.

Thanks again!
Well, a normal a/f gauge is not compatable with wide band o2 sensors, thats why people use things like utec logging and deltadash to truely monitor their a/f ratio. Now on the other hand Greddy's a/f gauge comes with a semi-wideband o2 sensor that is more accurate.

-Subix
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Old 10-02-2002, 10:35 PM   #7
crazyhorse
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Well I knew that I'd need a wide band O2 sensor if I wanted to be accurate.. and planned on using the UTec or Delta Dash to monitor it.. but I didn't think the rex had one stock... And I guess I was right thinking it didn't?
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Old 10-03-2002, 01:12 AM   #8
DarthChicken
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My bad guys... I misread the form. Its using the front o2 sensor in the position its in. At least I didn't go tuning in the state of mind I'm in, otherwise I would have just kept adding more and more fuel

The log files can be a bit frustrating sometimes, because seeing the word "ECU" instead of a number is something that really makes me want to see what its REALLY doing. I know... let the ECU do its own thing below 60% TPS... I'm still in LINK tuning mode

As to whether or not the rex has a wide band o2 sensor... does it matter? You get A/F ratios out of it, it seems to work just fine. I say save grand, and buy a bigger turbo!
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Old 10-03-2002, 01:14 AM   #9
STi_Pete
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Darth what are you're feeling on the UTEC as opposed to the LINK.
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