Does a Wideband o2 need to be calibrated?

[Diavolo]

Got the wideband hooked up. First run at WOT, LTFT's lock in at 0, commanded A/F is 10.9 and my Wideband is reading 9.4. Things seem right?

http://www.scandepot.net/viewscan.php?pk=4699

Click to read more...

 

[Diavolo]

(N0/51) * 2.98 + 7.5

That is the formula I am using to convert the volts to AF. I found it on the DHP forum, but I do not know what it is derived from

 

[GTPNoga]

Does a Wideband o2 need to be calibrated?

My NGK needs to be calibrated in the free air. I think the PLX also need to be calibrated. As for the formula each wideband has a different one so find the one that is used for your widebad.

 

[Diavolo]

Ok so I found the formula I posted in my 2nd post and then I also found

(N0/51) * 2 + 10. Using this formula, my AFR is around 11.0 - 11.1.

 

[TommyGloves]

Which WB are you using?

The first formula ( (N0/51) * 2.98 + 7.5) is typically used for the Innovate WBs (LM-1/LC-1).

The second formula( (N0/51) * 2 + 10 ) is typically used for the PLX SM-AFR and AEM UEGO Controller.

The Innovate products require free-air calibration every once in a while. The PLX-SM AFR (which I have) is doesn't require calibration. It depends on the unit you have.

 

[Diavolo]

ok, I have the AEM UEGO. So I redid the forumla in Excel. I am still running pretty rich, but not as bad as I thought

Thanks

 

[PANDA]

Does the WB gauge read the same as the PT reading?

 

[Diavolo]

With the new formula, yeah. When I was WOT, I saw 11.2 on the gauge.

 

[TommyGloves]

With the new formula, yeah. When I was WOT, I saw 11.2 on the gauge.

Cool...sounds like you are on the right track.

(Also...side note to help out....If you are looking to get your WB reading to match the Commanded AFR, modify your MAF table first.

Once you have that within -/+ 0.1 AFR, you can monkey with the Base PE and PE/RPM/Time table to richen or lean out your AFR.)

 

[DanJ]

I thought the AEM unit had some sort of weird pre-calibrated deal.

 

[TommyGloves]

I thought the AEM unit had some sort of weird pre-calibrated deal.

According to the instructions..it doesn't:

http://www.aempower.com/images/products/Installation Instructions 30-4100.pdf

The LC-1 is the one that requires the pre-calibration and re-calibration deal.

 

[Diavolo]

I am currently trying to get FTC 3 locking in consistently, then on to WOT tuning. My cruise numbers are pretty close. I have no idea what AF I am shooting for at WOT, but 11.2 is too rich.

Cool...sounds like you are on the right track.

(Also...side note to help out....If you are looking to get your WB reading to match the Commanded AFR, modify your MAF table first.

Once you have that within -/+ 0.1 AFR, you can monkey with the Base PE and PE/RPM/Time table to richen or lean out your AFR.)

 

[10sec]

yes 11.2 is pretty rich aren't you I/C'd?

 

[syP]

no


VS cam. zzp stage 4 ported blower, N*

 

[Stink Star]

I thought the AEM unit had some sort of weird pre-calibrated deal.

According to the instructions..it doesn't:

http://www.aempower.com/images/products/Installation Instructions 30-4100.pdf

The LC-1 is the one that requires the pre-calibration and re-calibration deal.

the AEM is pre-calibrated with a resistor inline for the sensor. Each new sensor you get has its own pre calibrated resistance built in so free air calibration is not necessary.

in all honesty i wouldnt be too concerned between 10.9:1 vs. 11.1:1 though

 

[firemandan1700]

I have yet to install my wb. I though it was a true reading from the wideband once you installed it. I am glad i know this now. Shit just got harder lol.

 

[Diavolo]

Fireman, the gauge is correct, the output to PT though is in volts so you need to convert it to AF.

 

[M@]

shoot for 11.5-11.7 on a non-ic L67...

Should make good power, and not want to knock too badly.