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Old 03-10-2007, 05:43 PM   #1
rebizap
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Default Stock sti wideband W/enginunity

So i have been doing some data logging with enginuity on my 05 sti and have noticed that there is a option to log widebad o2. Is this accurate enough to tune from. I have a stock ecu with 3'' tbe catless and a perrin o2 simulator on the rear o2 sensor if that makes any difference.

It appears to accuratly match the targeted afr in the ecu map so what do you think? I have been eyeing the Lc-1 but if this is an option i would choose to save the $ for other purchases.

thanks
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Old 03-11-2007, 03:45 AM   #2
HndaTch627
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no, the factory widebands are useless under 11.5:1 or so
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Old 03-11-2007, 03:52 AM   #3
Freon
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The stock O2 is not accurate under 12.5-13:1 or so in practice. There is a thread going on in the Enguinity forum discussing trying to relocate the stock O2 post turbo to see if it does any better, although I don't think that is a great idea regardless of if it makes it accurate.
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Old 03-11-2007, 04:06 AM   #4
HndaTch627
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Quote:
Originally Posted by Freon View Post
The stock O2 is not accurate under 12.5-13:1 or so in practice. There is a thread going on in the Enguinity forum discussing trying to relocate the stock O2 post turbo to see if it does any better, although I don't think that is a great idea regardless of if it makes it accurate.
yeah i couldn't remember exactly where it became useless at but i knew under 11.5:1 off the top of my head. Relocating it to post turbo isn't going to help matters, it will just slow it's off boost response time and also probably cause premature sensor failure
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Old 03-11-2007, 06:42 AM   #5
rebizap
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Thanks for the info. I guess if it sounds to good to be true than it probably is. So back pressure from the header to turbo is what causes the inaccuracy? And the therory on the enginunity forum is that by moving the sensor after the turbo there will be less exhaust pressure and therefore it will be more accurate? So how will the ecu react if you move the sensor since reading will be different and the ecu uses it to check targeted afr?
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Old 03-11-2007, 08:13 AM   #6
Freon
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Originally Posted by rebizap View Post
So back pressure from the header to turbo is what causes the inaccuracy? And the therory on the enginunity forum is that by moving the sensor after the turbo there will be less exhaust pressure and therefore it will be more accurate? So how will the ecu react if you move the sensor since reading will be different and the ecu uses it to check targeted afr?
1) It is assumed so. The sensor is a "wideband" but I'm not convinced it is as wide of a band as a typical Bosch sensor.
2) see 1
3) I know the delay on my LM-1 WB at the bottom of the downpipe is considerable at idle. Enough that I'm going to guess it will give the ECU a hard time trimming fuel.

Honestly, I'd just buy an aftermarket unit like the LC-1.
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