PLX Device Voltages vs. AFR
 

I'm looking into figuring out a way to Datalog my DIY WB values but it does not corrispond with a PLX device mainly because it is non-linear.

Anybody have the reference voltage for the PLX device in the TE/ECUcontrol Plugging. That way when I log AFR I can Export to a ------ sheet and convert the AFRs to Voltages in Excel then Cross reference with the values I need.

Re: PLX Device Voltages vs. AFR
 

The output voltages shouldnt have anything really to do with the device and more with the type of sensor used...no?

Re: PLX Device Voltages vs. AFR
 

If they're non-linear, then it's not going to work... because those voltages won't corrospond with the voltages of the PLX.

Re: PLX Device Voltages vs. AFR
 

does the output of the LC-1 match the PLX??
and iif it doesnt can you scale the voltages in ECUcontrol??

Re: PLX Device Voltages vs. AFR
 

I know this, but if my sensor at 1.95volts is 11.5:1 AFR and on the PLX it is 10.1:1, ECUControl will log the 10:1, I then can take it into Excel, Convert the PLX 10:1 to voltage, and Vawla, I have my WB Voltage output that I can Corrispond to my AFR readings.

I otherwords, I just want to log the voltage of the sensor, seeing as I can't do it straight up, I will log it as a PLX Device.
i don't believe ECUControl will car if the Sensor is linear or not rights, It's still going to log what it reads, and then I can interpret the values.v Right?

FYI: The DI-WB use the Honda VX Sensor.

Re: PLX Device Voltages vs. AFR
 

Okay I just found the equation from the PLX Site.

If I log a 15:1 AFR on a PLX Device thats

AFR=2*Voltage+10
Thus
Voltage is going to be
V=(15-10)/2
V=2.5volt
Take that to my sensor:
where 2.5 volts is 14.70AFR.

I have an equation for the Voltage to AFR for my sensor, so I won't alway have to reference to a chart, just copy and paste into cells.

Anyone see a problem with my theory.

Re: PLX Device Voltages vs. AFR
 

Also If I have an equation to determine the Voltage to AFR could that not be written into ECUControl so that a non-linear device can be used? I'm not a Programming or ECU Genius so I don't now how the ECU would interpret this input?

Re: PLX Device Voltages vs. AFR
 

If you have a formula that converts it, yes... otherwise, if you're using a "Table" then that is a pain in the ass because it has to be statically compared.

The ECU also doesn't "do" anything with the information. ECUs do not interpret the WBO2 data...

Re: PLX Device Voltages vs. AFR
 

That's what I thought.
I used Excel TrendLine to dtermine it, In comparisson it is on like xx.xx2 off, so not biggy. The widebands accuracy isn't even that exact.

What are the instructions for inputing WBo2 for Datalogging using TE/ECUControl?

Re: PLX Device Voltages vs. AFR
 

I dont' know.. you'll have to get with Nick about that. So far, I don't think he's got anything setup for userdefinable WB tables.

Re: PLX Device Voltages vs. AFR
 

But as far as sending the voltages to the ECU

Do I just input the 0-5volt signal through C16(Stock o2), disable the o2 sensor in my TE code so it stays in open loop and set the Pluggin for ECUControl to the PLX Device instead of the Stock Device?

Re: PLX Device Voltages vs. AFR
 

Yes, connect it to stock O2 location,and disable O2 in the ROM.

As far as ECUControl.. I do'nt know, I don't use it.

Re: PLX Device Voltages vs. AFR
 

Thanks man, I'll have to give this a try.

Also then

What does the Almighty TurboEF9 Use?

Re: PLX Device Voltages vs. AFR
 

I wrote my own datalogger, of course. :)

Re: PLX Device Voltages vs. AFR
 

Damn to be a Genius!

Re: PLX Device Voltages vs. AFR
 

You know J. Parker gets all the ladies with his madd coding skeeelz :-X

Re: PLX Device Voltages vs. AFR
 

Yes this works. I log as a PLX device, then save to Excel.

I wrote a Macro to Convert, It corrispond within 3 decimal Places to my Digital Voltmeter.

I haven't used it to tune yet, but at idle and rev in the shop it works.

Re: PLX Device Voltages vs. AFR
 

Good work! ...is this somethign you can post and share for others?

Re: PLX Device Voltages vs. AFR
 

Will do later.

Re: PLX Device Voltages vs. AFR
 

Would anyone Really be interested in the Macro and The instructions for this. It is a little in depth, as I don not know how many people know how to write Macros and use trendlines.

Seeing as every WB is different and I only know of the DIY and AEM one being non-linear.