Author Topic: O2 sensor question (Read 7163 times)

mwilderl · « **Reply #15 on:** June 11, 2011, 12:14:18 AM »

Might be setting up a turbo on there, i have a log manifold, turbo and intercooler along with some piping. NOt sure what the benifits of having a WB O2 is though.

Nelson_40 · « **Reply #16 on:** June 12, 2011, 09:21:29 PM »

Quote from: mwilderl;104495

Might be setting up a turbo on there, i have a log manifold, turbo and intercooler along with some piping. NOt sure what the benifits of having a WB O2 is though.

In my understanding a narrow band sensor, i.e. regular O2 sensor, will operate more like and on/off switch in terms of detecting lean/rich operation. Whereas a wide band sensor will provide ECU inputs more akin to the operation of a rheostat, allowing more precise fuel metering and thus better power delivery. The benefit is that in turbo/supercharged settings you get safe metering of fuel without risking detonation, not to mention that the engine should not run as rich the way some poorly tuned cars run. If this isn't accurate I hope someone else will chime in.

Bl0mgren · « **Reply #17 on:** June 13, 2011, 11:26:38 AM »

original ecu need narrow band signal input.
http://www.autometer.com/tech_faq_answer.aspx?sid=1&qid=48

Nelson_40 · « **Reply #18 on:** June 13, 2011, 04:07:35 PM »

Quote from: Bl0mgren;104537

original ecu need narrow band signal input.

There are some wide band to narrow band converters available for this task, but I do not know if our Motronic will work well with them. Any one else have a wide band sensor with a stock ECU that can enlighten everyone?

bmwman91 · « **Reply #19 on:** June 13, 2011, 06:44:57 PM »

The basic description of narrow-band sensor output is that they are only accurate for exhaust gas mixtures from a stoichiometric burn (~14.7:1 A/F). In rich & lean conditions, there isn't a good way to pull exact A/F ratios because the exhaust gas temperature is not accounted for, which makes a difference. Hence, they can only be accurate for a very narrow range of A/F ratios. Wide-band sensors do account for temperature, allowing them to accurately read a wider range of A/F ratios.

mwilderl · « **Reply #20 on:** June 14, 2011, 01:34:17 PM »

so it sounds like i need to get a NB sensor until i decide i should go to a standalone ecu?

bmwman91 · « **Reply #21 on:** June 14, 2011, 02:42:11 PM »

For the most part, yes. A WBO2 system really doesn't do anything for you with the stock ECU, unless you are trying to rig up a forced induction system with the stock ECU and larger injectors.

mwilderl · « **Reply #22 on:** June 14, 2011, 09:00:21 PM »

Might happen at some point in the next year

but we all know how long these things really take... I might just go all out when i do turbo and go to a standalone.

Bl0mgren · « **Reply #23 on:** June 19, 2011, 09:23:01 AM »

Quote from: Nelson_40;104543

There are some wide band to narrow band converters available for this task, but I do not know if our Motronic will work well with them. Any one else have a wide band sensor with a stock ECU that can enlighten everyone?

I have Innovate LC1 for this task, works good.

Bl0mgren · « **Reply #24 on:** June 21, 2011, 03:46:09 PM »

found a interesting thread.. right or wrong?
http://forums.bimmerforums.com/forum/showthread.php?t=788400