why is the stock O2 sensor is not accurate? Why the need in a wideband? how the ecu deals with the stock O2 sensor???

 

SEARCH!

 

I did,, but theres is no explanation about the differences between the stock O2 and the aftermarket wideband,, I mean the stock O2 sensor has to be somewhat accurate, no?

 

stock o2 is 3-4wires, wideband is 5. Thats all i can say for now, as i was looking foward to tuning with the stock o2 but people just tell me NO.

 

what if its being tuned with hondata, do you still need a wideband

 

stock o2 sensor detect stoich reading only! wideband gives you exact A/F valve. ECU need input of rich, stoich, or lean...this is what your dang o2 sees that is why narrow band A/F gauges are worthless in tuning. have a nice day

 

not positive but i think the stock narrowband O2 is designed to only to be acurate around a specific voltage(AFR), so as it strays away from that point it has less accuracy.

I hear of dsm guys using the stock O2s for tuning all the time. I wonder if they are just making do with a crappy tuning method or if their cars have O2s that are better for tuning?

I tune my afc hack with the O2 sensor voltage. hasn't blown up yet at .90-.94v under full throttle/boost. I don't really trust it, but it seems better than nothing and I have all the signs of running rich.

 

Read this

http://www.nitroburn.com/pgmfi...andO2

What is a narrowband output?

Narrowband is what your stock O2 sensor is giving you, it is of the range 0-1volts, so there is not very much room for resolution or "accuracy." Also it was engineered to save costs, and really only tells you if you are above or at stoich (14.7:1 A/F). This is not accurate enough for tuning.

 

I tune the same way and after tuned with stock o2 we took it to the dyno and found that it was right on the money except one spot around 4k that was just a lil lean....this was for 6psi.....i just raised the boost to 10psi and tuned it in with the stock o2 and will be headin to the dyno in like a month or so, maybe i just got lucky the first time.....we'll see

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoulSurfer &raquo;</TD></TR><TR><TD CLASS="quote">Read this

http://www.nitroburn.com/pgmfi...andO2</TD></TR></TABLE>

Hrm, that looks an awful lot like this:

https://honda-tech.com/zerothread?id=635792

-PHiZ

 

Did you write it? Good stuff.

 

the wideband o2 sensor has a 5th wire. it measures the rpm. something like that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aka010010 &raquo;</TD></TR><TR><TD CLASS="quote">the wideband o2 sensor has a 5th wire. it measures the rpm. something like that</TD></TR></TABLE>
Yes it has a 5th wire. No, the 5th wire is not for measuring rpm.

 

wide band tells the computer exactly what the air fuel mixture is like

O2: 12:1
ECU: ok
O2:14.7:1
ECUkay

a regular 02 sensor is not really sure..its more like

O2: hey its rich
ECUkay
o2:Its Lean
ECUkay
o2: just right
Ecu.okay

get my drift.....i know its a bad example or anology but i hope yall understand me